Publikationen 2002
V. Szalay, L. Kovács, M. Wöhlecke,
E. Libowitzky
Stretching potential and equilibrium length of the OH bond in solids
Chem. Phys. Letters 354, 56 - 61 (2002)
T. Granzow, U. Dörfler, Th. Woike,
M. Wöhlecke, R. Pankrath, M. Imlau ,W. Kleemann
Local electric-field-driven repoling reflected in the ferroelectric polarization
of Ce-doped Sr0.61Ba0.39Nb2O6.
Appl. Phys. Letters 80, 470 - 472 (2002)
T. Granzow, U. Dörfler, Th. Woike,
M. Wöhlecke, R. Pankrath, M. Imlau ,W. Kleemann
Evidence of random electric fields in the relaxor-ferroelectric Sr0.61Ba0.39Nb2O6
Europhysics Letters 57, 597 - 603 (2002)
A. Ruediger, O.F. Schirmer, A.K.
Kadashchuk, Yu.A. Skryshevskii
Pyroelectric luminescence via internal Poole-Frenkel effect
Europhysics Letters 57, 592 (2002)
Publikationen 2001
O. F. Schirmer, C. Veber, M. Meyer
Parameters of light-induced charge transfer processes in photorefractive
crystals
Physics of the Solid State (in print)
G. Malovichko, V. Grachev, R.
Pankrath, O. Schirmer
Photosensitive centers and charge transfer processes in barium calcium titanate
Ferroelectrics (in print)
A. Ruediger, O. F. Schirmer, A.
Kadashchuk, A. Grabar
Light-induced charge transfer in nominally pure and iron doped Sn2P2S6:
a study by combined EPR-optical absorption spectroscopy
Trends in Optics and Photonics Series 62, 568 (2001)
S. Bernhardt, L. Mize, P. Delaye, R.
Pankrath, O. Schirmer, G. Roosen
Orientation dependence of photorefractive gain in BCT: determination of
electro-optic coefficients
Trends in Optics and Photonics Series 62, 504 (2001)
V. V. Gladkii, V. A. Kirikov, E. V.
Pronina, T. R. Volk, R. Pankrath, M.
Wöhlecke
Anomalies in the Slow Polarisation Kinetics of a Ferroelectric relaxor in the
Temperature Region of a Diffuse Phase Transition
Physics of the Solid State 43, 2140-2145 (2001)
T. Volk, L. Ivleva , P. Lykov, D.
Isakov, V. Osiko, M. Wöhlecke
Modification of the optical and photorefractive properties of Ce-doped strontium-barium niobate by co-doping with a
nonphotorefractive La impurity
Appl. Phys. Letters 79, 854 (2001)
A. Ruediger, O. Schirmer, S. Odoulov, A.
Shumelyuk, A. Grabar
Studies of light-induced charge transfer in Sn2P2S6 by
combined EPR/optical absorption
spectroscopy
Optical Materials 18, 123 (2001)
O. F. Schirmer, M. Meyer, A. Ruediger, C. Veber
Combined EPR/optical investigations of light-induced charge transfers in photorefractive
materials
Optical Materials 18, 1 (2001)
T. Volk, L. Ivleva, P. Lykov, N. Pollok,
V. Salobutin, R. Pankrath, M. Wöhlecke
Effects of rare-earth impurity doping on the ferroelectric and photorefractive
properties of strontium-barium niobate crystals
Optical Materials 18, 179 (2001)
Th. Woike, T. Granzow, U. Dörfler, Ch.
Poetsch, M. Wöhlecke, R. Pankrath
Refractive Indices of congruently melting Sr0.61Ba0.39Nb2O6
phys. stat. sol. (a) 186, R13 (2001)
M. Wöhlecke, L. Kovács
OH- ions in Oxide Crystals
Critical Reviews in Solid State and Materials Sciences, 26(1):1 - 86
(2001)
H.J. Reyher, M. Pape, N. Hausfeld
Photoactive Pb
J. Phys.: Condens. Matter 13, 3767 (2001)
T. Granzow, U. Dörfler, Th. Woike,
M. Wöhlecke, R. Pankrath, M. Imlau, W. Kleemann
Influence of pinning effects on the ferroelectric hysteresis in cerium-doped SrxBa1-xNb2O6
Phys. Rev B 63, 174101 (2001)
T. Volk, B. Maximov, T. Chernaya, N.
Rubinina, M. Wöhlecke, V. Simonov
Photorefractive Properties of LiNbO3:Zn Crystals Related to the Defect Structure
Appl. Phys. B 72, 647 (2001)
Th. Woike, U. Dörfler, L. Tsankov, G.
Weckwerth, D. Wolf, M. Wöhlecke, T. Granzow,
R. Pankrath, M. Imlau, W. Kleemann
Photorefractive properties of Cr-doped Sr0.61Ba0.39Nb2O6
related to crystal purity and doping concentration
Appl. Phys. B 72, 661 (2001)
Publikationen 2000
G. Malovichko, V. Grachev, E. Kokanyan, O. Schirmer
EPR, NMR and ENDOR study of intrinsic and extrinsic defects in disordered
and regularly ordered ltihium niobate crystals
Ferroelectrics 239, 1227 (2000)
H.J. Reyher, N. Hausfeld, M. Pape
A magnetic circular dichroism and optically detected magnetic resonance
investigation of Fe2+ and Fe3+ centres in KTaO3
J. Phys.: Condens. Matter 12, 10599 (2000)
M. Meyer, M. Wöhlecke, O. F. Schirmer
On the temperature dependence of the band edge of Sr0.61Ba0.39Nb2O6
phys. stat. sol. (b) 221, R1 (2000)
O. F. Schirmer
EPR investigations of small electron and hole polarons in oxide perovskites
in ‘Defects and surface-induced effects in advanced perovskites’, G. Borstel et
al. (eds.), Kluwer 2000, p. 75 – 88
H. Donnerberg, A. Birkholz
Ab initio study of oxygen vacancies in barium titanate
J. Phys.: Condens. Matter 12, 8239 (2000)
V. Grachev, G. I. Malovichko
EPR, ENDOR and optical absorption study of Cr3+ centers substituting for
niobium in Li-rich lithium niobate crystals
Phys. Rev. B 62, 7779 (2000)
J. Wingbermühle, M. Meyer, O. F. Schirmer, R.
Pankrath, R. K. Kremer
Electron paramagnetic resonance of Ce3+ in strontium-barium niobate
J. Phys.: Condens. Matter 12, 4277 (2000)
S. Lenjer, R. Scharfschwerdt, Th. W. Kool, O. F.
Schirmer
An off-center ion near a Ba site in BaTiO3 as studied by EPR under uniaxial
stress
Solid State Commun. 116, 133 (2000)
R. Ratheesh, M. Wöhlecke, B. Berge, Th.
Wahlbrink, H. Haeuseler, E. Rühl, R. Blachnik, P. Balan, N. Santha, M. T. Sebastian
Raman study of the ordering in Sr(B'0.5Nb0.5)O3 compounds
J. Appl. Phys. 88, 2813 (2000)
T.
R. Volk, V. Yu. Salobutin,
L. I. Ivleva, N. M. Polozkov, R. Pankrath, and M. Wöhlecke
Ferroelectric
Properties of Strontium Barium Niobate Crystals Doped with Rare-Earth Metals
Physics of the Solid State 42, 2129-2136 (2000)
Publikationen 1999
V. Grachev, G. Malovichko, O. Schirmer
Models of axial and low-symmetry impurity centers in lithium niobate crystals derived
from EPR and ENDOR data
Radiation Effects and Defects in Solids 150, 277 (1999)
G. Malovichko, V. Grachev, E. Kokanyan,
O. Schirmer
Point imperfections and clusters of intrinsic and extrinsic defects in
non-stoichiometric and stoichiometric Lithium Niobate: The Regularly ordered crystal
Radiation Effects and Defects in Solids 150, 227 (1999)
Y. Lin, J.E. Eldridge, J. Sichelschmidt, S.W.
Cheong, T. Wahlbrink
Fröhlich-interaction induced one-phonon Raman scattering in La2CuO4
using an infrared laser
Solid State Commun. 112, 315 (1999)
O.F. Schirmer, A. Mazur, C. Veber, A. Rüdiger
Photoinduced charge transport in BaTiO3 and congruent Ba1-xCaxTiO3
doped with transition metal and alkali ions
Trends in Optics and Photonics (TOPS) 27, 149 (1999)
T. Volk, T. Woike, U. Dörfler, H.
Schmitz, R. Pankrath, M. Wöhlecke
Ferroelectricity Driven Two-Beam Coupling Gain in Strontium-Barium Niobate Crystals
Trends in Optics and Photonics (TOPS) 27, 86 (1999)
M. Pape, H.J. Reyher, N. Hausfeld, S. Mendricks
Photoactive Pb3+ host lattice ions in photorefractive Pb5Ge3O11
characterized by ODMR and EPR
Trends in Optics and Photonics (TOPS) 27, 42 (1999)
T. Volk, B. Maximov, S. Sulyanov, N. Rubinina,
F. Abdi, M. Aillerie, M. Fontana, P. Bourson, M. Wöhlecke
Optical and Photorefractive Properties of Optical-Damage Resistant LiNbO3:Zn
Crystals Related to Structure Parameters
Trends in Optics and Photonics (TOPS) 27, 144 (1999)
M. Wierschem, C. Bäumer, A. Jovanovic, M.
Wöhlecke, S. Kapphan, L. Kovács
Fundamental and overtone spectra of the OH and OD stretch mode in congruent and
stoichiometric LiTaO3
phys. stat. sol. (b) 215, R7 (1999)
H.-J. Reyher, N. Hausfeld, M. Pape, J. Baur, J.
Schneider
Attribution of the Near-UV Absorption Bands of YAG: Ce to Ce3+-Ions by MCD and
ODMR
Solid State Commun. 110, 345 (1999)
R. Scharfschwerdt, O. F. Schirmer, H. Hesse, D.
Rytz
Fermi level engineering of BaTiO3 by alkali codoping: Increasing the near
infrared absorption by rhodium,
Appl. Phys. B 68, 807 (1999)
G. Malovichko, V. Grachev, O. Schirmer
Interrelation of intrinsic and extrinsic defects. Congruent, stoichiometric and regularly
ordered lithium niobate
Appl. Phys. B 68, 785 (1999)
F. Abdi, M. Aillerie, M. Fontana, P. Boursons,
T. Volk, B. Maximov, S. Sulyanov, N. Rubinina, and M. Wöhlecke
Influence of Zn doping on electrooptical properties and structure parameters of lithium
niobate crystals
Appl. Phys. B 68, 795 (1999)
U. B. Dörfler, R. Piechatzek, Th. Woike, M. K.
Imlau, V. Wirth, L. Bohaty, T. Volk, R. Pankrath, and M. Wöhlecke
A holographic method for the determination of all linear electrooptic coefficients applied
to Ce-doped Strontium-Barium-Niobate, Appl. Phys. B 68, 843 (1999)
O.F. Schirmer
Light-induced charge transfer between defects in photorefractive materials
Radiation effects and defects in solids, 149, 1 (1999)
A. Mazur, C. Veber, O.F. Schirmer, C. Kuper, H.
Hesse
Light-induced charge transport in photorefractive BaTiO3: Fe and Ba0,77
Ca0,23TiO3: Fe
Radiation effects and defects in solids 150, 281 (1999)
A. Mazur, C. Veber, O.F. Schirmer, C. Kuper, H.
Hesse
Light-induced charge transport processes in photorefractive Ba0,77Ca0,23TiO3
doped with iron
J. Appl. Phys. 85, 6751 (1999)
S. Köhne, O.F. Schirmer, H. Hesse, T.W. Kool,
V. Vikhnin
Ti3+ Jahn-Teller polarons and bipolarons in BaTiO3
J. Superconductivity 12, 193 (1999)
G.I. Malovichko, V. Grachev, E. Kokanyan, O.
Schirmer
Axial and low symmetry centers of trivalent impurities in lithum niobate. Chromium in
congruent and stoichiometric crystals, Phys. Rev. B 59, 9113 (1999)
H. Donnerberg
Atomic Simulation of Electrooptic and Magnetooptic Oxide Materials
Springer Tracts in Modern Physics, Vol. 151, Springer Verlag (Berlin, Heidelberg 1999)
Publikationen 1998
T. R. Volk, M. Wöhlecke
Optical Damage Resistance in Lithium Niobate Crystals,
Ferroelectrics Review 1, 195-262 (1998)
K. Kasemir, K. Betzler, B. Matzas, B. Tiegel,
T. Wahlbrink, M. Wöhlecke, B. Gather, N. Rubinina, T. Volk
Influence of Zn/In-codoping on the optical properties of Lithium Niobate
J. Appl. Phys. 84, 5191 (1998)
H. Kröse, R. Scharfschwerdt, A. Mazur,
O. F. Schirmer
A multichannel spectrometer for correlated EPR-optical absorption analysis of photochromic
processes in crystals;
Appl. Phys. B-Lasers & Optics. 67, 79-86 (1998)
E. Ruza, H. J. Reyher, J. Trokss, M. Wöhlecke
Optically detected magnetic resonance via the blue luminescence of Ti-doped Al2O3
J. Phys. Condens. Matter 10, 4297 (1998)
T. Woike, T. Volk, U. Dörfler, R. Pankrath, L.
Ivleva, M. Wöhlecke
Ferroelectric and optical hysteresis in SBN doped with rare-earth elements
Ferroelectric Letters 23, 127 (1998)
K. Kasemir, K. Betzler,
B. Matzas, B. Tiegel, M. Wöhlecke, N. Rubinina, T. Volk
Influence of In Doping on the Refractive Indices of Lithium Niobate
physica status solidi (a) 166/1, R7 (1998)
Publikationen 1997
B. I. Kochelaev,
J. Sichelschmidt, B. Elschner, W. Lemor (Univ. Osnabrück), A. Loidl
Three-Spin Polaron in La2-xSrxCuO4: Experimental evidence
by EPR measurements
Phys. Rev. Lett. 79, 4274 (1997)
Th. Woike, U. Dörfler, M. Imlau, G. Schetter, T. Volk, M.
Wöhlecke, R. Pankrath
Die ferroelektrischen und photorefraktiven Eigenschaften von Sr0.61Ba0.39Nb2O6
dotiert mit Cr, Co, Ce, Tm
Z. Krist. Suppl. 12, 96 (1997)
A.
Mazur, U. van Stevendaal, K. Buse, M. Weber, O. F. Schirmer, H. Hesse, E. Krätzig
Light-Induced Charge Transport Processes in Photorefractive Barium Titanate Crystals Doped
with Iron
Appl. Phys. B 65, 481 (1997)
T.
Volk, T. Woike, U. Dörfler, R. Pankrath, L. Ivleva, M. Wöhlecke
Ferroelectric phenomena in holographic properties of strontium-barium niobate crystals
doped with rare-earth elements
Ferroelectrics 203, 457 (1997)
A.
Mazur, O. F. Schirmer, S. Mendricks
Optical absorption and light-induced charge transport of Fe2+ in BaTiO3
Appl. Phys. Lett. 70, 2395 (1997)
M.
Wöhlecke, T. Volk, H. Donnerberg
On the Role of Intrinsic Clusters in Damage-Resistant LiNbO3
Ferroelectrics Letters 22, 53 (1997)
H.
Donnerberg
Computer Modeling of Trapped Holes in Barium Titanate
(ICDIM conference, Winston-Salem, North Carolina 1996)
Materials Science Forum 239-241, 341 (1997)
H.-J.
Reyher, B. Faust, B. Sugg, R. Rupp, L. Ackermann
Optically detected magnetic resonance via the magnetic circular dichroism of absorption of
cerium impurities in bulk paramagnetic terbium gallium garnet
J. Phys.: Condens. Matter 9, 9065 (1997)
L.
Kovács, G. Ruschhaupt, K. Polgár, G. Corradi, M. Wöhlecke
Composition dependence of the ultraviolet absorption edge in lithium niobate
Appl. Phys. Lett. 70, 2801 (1997)
H.
Donnerberg, S. Többen, A. Birkholz
Formation of Localized Hole States in Complex Oxides
J. Phys.: Condens. Matter 9, 6359 (1997)
Publikationen 1996
V.
G. Grachev, G. I. Malovichko, O. F. Schirmer
Single, dimer and trimer chromium centers in LiNbO3
Ferroelectrics 185, 639 (1996)
R.
Scharfschwerdt, O. F. Schirmer, H. Kröse, T. W. Kool
Oxygen vacancy related defects in BaTiO3,
Ferroelectrics 185, 643 (1996)
T.
Varnhorst, O. F. Schirmer, H. Kröse, R. Scharfschwerdt, T. W. Kool
O--holes associated with alkali acceptors in BaTiO3
Phys. Rev. B 53, 116 (1996)
B.
Faust, H.-J. Reyher, O. F. Schirmer
Optically detected magnetic resonance of Fe4+ - OI in KTaO3
Solid State Commun. 18, 445 (1996)
U. Schlarb, B. Matzas, A.
Reichert, K. Betzler, M. Wöhlecke, B. Gather, T. Volk, N. Rubinina
Refractive indices of Zn/In-Co-doped lithium niobate
Ferroelectrics 185, 269 (1996)
T. Volk, M. Wöhlecke, N.
Rubinina, A. Reichert, N. Razumovski
Optical-damage-resistant impurities (Mg, Zn, In, Sc) in lithium niobate
Ferroelectrics 183, 291 (1996)
A.
R. Scharfschwerdt, A. Mazur, O. F. Schirmer, H. Hesse, S. Mendricks
Oxygen Vacancies in BaTiO3
Phys. Rev. B 54, 15284 (1996)
G.
Wübbeler, O. F. Schirmer, S. Köhne
Phase separation in La2CuO4+d as probed
by a paramagnetic surface defect
Phys. Rev. B 54, 9054 (1996)
W.
Lemor, G. Wübbeler, O. F. Schirmer
Phase Separation in La2CuO4+d studied by
electric transport measurements
Journal of Superconductivity 9, 365 (1996)
H.-J.
Reyher, B. Faust, M. Käding, H. Hesse, E. Ruza, M. Wöhlecke
Optical alignment of axial Fe centers in KTaO3
Phys. Rev. B 51, 6707 (1995), Erratum: Phys. Rev. B 54,
3662 (1996)
H.-J.
Reyher, B. Faust, M. Maiwald, H. Hesse
ODMR and EPR investigations of Fe centers in KTaO3
Appl. Phys. B 63, 331 (1996)
M.
Wöhlecke, G. Corradi. K. Betzler
Optical methods to characterise the composition and homogeneity of lithium niobate single
crystals
Appl. Phys. B 63, 323 (1996)
H.
Donnerberg, R. H. Bartram
Embedded Cluster Calculations for Transition-Metal Impurities in BaTiO3
J. Phys.: Condens. Matter 8, 1687 (1996)
H.
Donnerberg
Comments on the Defect Chemistry of Magnesium-doped Lithium Niobate
J. Solid State Chem. 123, 208 (1996)
Publikationen 1995
T. Volk, M. Wöhlecke, N.
Rubinina, N. V. Razumovski, F. Jermann, C. Fischer, R. Böwer
LiNbO3 with the damage-resistant impurity indium
Appl. Phys. A 60, 217 (1995)
T. Volk, M. Wöhlecke, A.
Reichert, F. Jermann, N. Rubinina
The peculiar impurity concentration ranges in damage resistant LiNbO3 crystals
doped with Mg, Zn, In and Sc
Ferroelectrics Lett. 20, 97 (1995)
F.
Jermann, M. Simon, R. Böwer, E. Krätzig, O. F. Schirmer
Light-induced absorption changes in reduced lithium niobate
Ferroelectrics 165, 319 (1995)
H. Kröse, E. Possenriede, R. Scharfschwerdt, T.
Varnhorst, O. F. Schirmer, H. Hesse, C. Kuper
Optically induced charge transfer paths between defects in BaTiO3 containing
rhodium
Optical Materials 4, 153 (1995)
H.
Kröse, R. Scharfschwerdt, O. F. Schirmer, H. Hesse
Light-induced charge transport in BaTiO3 via three charge states of rhodium
Appl. Phys. B 61, 1 (1995)
O.
F. Schirmer, H. J. Reyher, M. Wöhlecke
Characterisation of point defects in photorefractive oxide crystals by paramagnetic
resonance methods, Chap. 4 in 'Insulating Materials for Optoelectronics', ed. F.
Agulló-López, World Scientific (1995)
W.
Lemor, G. Wübbeler, O. F. Schirmer
Phase separation in La2CuO4 as probed by impedance spectroscopy,
Solid State Commun. 95, 823 (1995)
M.
Exner, H. Donnerberg, O. F. Schirmer, C. R. A. Catlow
Computer Simulation of Defects in KTaO3
Phys. Rev. B 52, 3939 (1995)
B.
Sugg, N. Nürge, B. Faust, E. Ruza, R. Niehüser, H.-J. Reyher, R. A. Rupp
The photorefractive effect in terbium gallium garnet
Optical Materials 4, 343 (1995)
B.
Briat, H.-J. Reyher, A. Hamri, N. G. Romanov, J. C. Launay, F. Ramaz
Magnetic circular dichroism and the optical detection of magnetic resonance for the Bi
antisite defect in Bi12GeO20
J. Phys.: Condens. Matter 7, 6951 (1995)
H.-J.
Reyher, J. Ruschke, F. Mersch
Photoinduced linear dichroism in sillenite crystals and in diamond
Radiation Effects and Defects in Solids 136, 1039 (1995)
U. Schlarb, A. Reichert, K.
Betzler, M. Wöhlecke, B. Gather, T. Volk, N. Rubinina,
SHG phase matching conditions for undoped and doped lithium niobate
Radiation Effects and Defects in Solids 136, 1029 (1995)
H.
Donnerberg, A. Birkholz
Atomistic Simulation Studies of Trapped Hole Bipolarons in BaTiO3
J. Phys.: Condens. Matter 7, 327 (1995)
H. Donnerberg
Refined embedded-cluster calculations for trapped hole bipolarons in BaTiO3
J. Phys.: Condens. Matter 7, L689 (1995)
H.
Donnerberg, A. Birkholz
Shell Model and Embedded Cluster Calculations of Hole Bipolarons in BaTiO3
Radiation Effects and Defects in Solids 134, 165 (1995)
H.
Donnerberg
New developments in the simulation of electrooptic oxides, Chap. 9 in "Insulating
Materials for Optoelectronics", ed. F. Agulló-López, World Scientific (1995)
U. Schlarb, M. Wöhlecke, B. Gather, A.
Reichert, K. Betzler, T. Volk, N. Rubinina
Refractive indices of Zn-doped lithium niobate
Optical Materials 4, 791 (1995)
Publikationen 1994
O. Thiemann, H. Donnerberg, M. Wöhlecke; O. F. Schirmer
Vibronic structure, energy level and incorporation mechanism of Ti3+ in LiNbO3
and LiTaO3
Phys. Rev. B 49, 5845 (1994)
H.-J. Reyher, R. Schulz, O. Thiemann
Investigation of the optical-absorption bands of Nb4+ and Ti3+ in
lithium niobate using magnetic circular dichroism and optically detected
magnetic-resonance techniques
Phys. Rev. B 50, 3609 (1994)
G. I. Malovichko, V. G. Grachev, O. F. Schirmer
The effect of iron ions on the defect structure of lithium niobate crystals grown from K2O
containing melts
Solid State Commun. 89, 197 (1994)
B. Faust, H. Müller, O. F. Schirmer
Free small polarons in LiNbO3
Ferroelectrics 153, 297 (1994)
E. Possenriede, H. Kröse, T. Varnhorst, R. Scharfschwerdt, O. F. Schirmer
Shallow acceptor and electron conduction states in BaTiO3
Ferroelectrics 151, 199 (1994)
H. Donnerberg, R. H. Bartram
Embedded Cluster Calculations on BaTiO3:Mn4+Ti
J. Lumin. 60&61, 162 (1994)
H. Donnerberg, M. Exner
Derivation and Application of Ab Initio Nb5+-O2- Short Range
Effective Pair Potentials in Shell Modell Simulations of KNbO3 and KTaO3
Phys. Rev. B 49, 3746 (1994)
H. Donnerberg, C.R.A. Catlow
Atomistic computer simulations of yttrium iron garnet as an approach to studying its
defect chemistry: II. Extrinsic defects
Phys. Rev. B 50, 744 (1994)
H. Donnerberg
Geometrical Microstructure of Fe3+-VO Defect Complexes in KNbO3
Phys. Rev. B 50, 9053 (1994)
M. Exner, C. R. A. Catlow, H. Donnerberg, O. F. Schirmer
Atomistic Simulation studies of LiK off-centre defects in KTaO3: I.
Isolated defects
J. Phys:. Condens. Matter 6, 3379 (1994)
O. F. Schirmer, G. Wübbeler, Th. Wahlbrink
Paramagnetic Resonance Studies of Phase Separation in Cuprate Superconductors, in ''Phase
Separation in Cuprate Superconductors'', E. Sigmund, K. A. Müller, eds., pp. 133,
Springer (1994)