Abstract
Local ion displacements and their anharmonicity in Eu2CuO4 and La2CuO4 crystals are studied by high-precision x-ray diffractometry. A symmetry analysis and the temperature behavior of the probability density function of Cu2+ ions reveal a degenerate ground orbital state in the Eu2CuO4 crystal (tetragonal doublet d xz, d yz). The pattern and anharmonicity of the local displacements are found to be determined not only by lattice vibrations but by 2D antiferromagnetic spin fluctuations in the CuO2 sheet as well. By contrast, in the La2CuO4 crystal the orbital ground state of the Cu2+ ion is a singlet (d z 2). The pattern of Eu3+ local displacements and their effect on the properties of the Cu subsystem in the Eu2CuO4 crystal are also studied.
Similar content being viewed by others
References
J. V. Tranquada, S. Heald, and S. Moodenbaugh, Phys. Rev. B 36, 8401 (1988).
L. A. Muradyan, R. A. Tamazyan, A. M. Kevorkov, Kh. S. Bagdasarov, and V. I. Simonov, Kristallografiya 35, 861 (1990) [Crystallogr. Rep. 35, 506 (1990)].
A. V. Babinskii, E. I. Golovenchits, N. V. Morozov, V. A. Sanina, and L. M. Sapozhnikova, Fiz. Tverd. Tela (Leningrad) 34, 60 (1992) [Sov. Phys. Solid State 34, 31 (1992)].
E. I. Golovenchits, S. L. Ginzburg, V. A. Sanina, and A. V. Babinskii, Zh. Éksp. Teor. Fiz. 107, 1641 (1995) [JETP 80, 915 (1995)].
E. I. Golovenchits, V. A. Sanina, and A. V. Babinskii, Zh. Éksp. Teor. Fiz. 110, 714 (1996) [JETP 83, 386 (1996)].
A. V. Babinskii, S. L. Ginzburg, E. I. Golovenchits, and V. A. Sanina, JETP Lett. 57, 299 (1993).
A. Abragam and D. Bleaney, Electron Paramagnetic Resonance of Transition Ions, Clarendon Press, Oxford (1970); Mir, Moscow (1972).
K. I. Kugel and D. I. Khomskii, Usp. Fiz. Nauk 136, 621 (1982) [Sov. Phys. Usp. 35, 231 (1982)].
S. Chakravarty, B. Halperin, and D. Nelson, Phys. Rev. B 39, 2344 (1989).
S. Dailey and S. French, Acta Crystallogr. Sec. A 38, 537 (1982).
W. R. Busing, K. O. Martin, and H. A. Levy, Oak Ridge Nat. Lab. Rept. ORNL-TM-305, Tennessee (1962).
D. W. J. Cruckshank, in Computing Methods in Crystallography, edited by J. S. Rollet, Pergamon Press, (1965), p. 112.
International Tables for X-Ray Crystallography, vol. 4, Kynoch Press, Birmingham (1974).
P. Bordet, J. J. Capponi, C. Chaillout, D. Chateigmer, J. Chenovas, T. Fourmier, J. L. Hodean, M. Marezio, M. Perroux, G. Thomas, and A. Vareva, Physica C 193, 178 (1992).
V. I. Andrianov, Kristallographiya 32, 228 (1987) [Sov. Phys. Crystallogr. 32, 130 (1987)].
P. J. C. Becker and P. Coppens, Acta Crystallogr. Sec. A 30, 129 (1974).
V. G. Tsirel’son, Itogi Nauki I Tekhniki: Kristallokhimiya 27, 1 (1993).
Yu. A. Abramov, V. G. Tsirelson, V. E. Zavodnik, S. A. Ivanov, and J. D. Brown, Acta Crystallogr. Sec. B 51, 942 (1995).
B. A. Strukov and A. P. Levanyuk, Physics of Ferroelectric Phenomena in Crystals [in Russian], Nauka, Moscow (1983).
M. F. Hundley, J. D. Thompson, S.-W. Cheong, F. Fisk, and S. B. Oseroff, Physica C 158, 102 (1989).
D. V. Fil, I. G. Kolobov, V. D. Fil, S. N. Barilo, and D. I. Zhigunov, Fiz. Nizk. Temp. 21, 1225 (1995) [J. Low Temp. Phys. 21, 937 (1995)].
S. L. Ginzburg, Irreversible Phenomena in Spin Glasses [in Russian], Nauka, Moscow (1989).
V. L. Gurevich, Kinetics of Phonon Systems [in Russian], Nauka, Moscow (1980).
E. I. Golovenchits, V. A. Sanina, and G. A. Smolenskii, JETP Lett. 40, 857 (1984).
E. I. Golovenchits, V. A. Sanina, A. A. Levin, Yu. F. Shepelev, and Yu. I. Smolin, Fiz. Tverd. Tela (Leningrad) 29, 3553 (1987) [Sov. Phys. Solid State 29, 2036 (1987)].
Author information
Authors and Affiliations
Additional information
Fiz. Tverd. Tela (St. Petersburg) 39, 1600–1608 (September 1997)
Rights and permissions
About this article
Cite this article
Golovenchits, E.I., Sanina, V.A., Levin, A.A. et al. Jahn-Teller effect and the orbital ground state of Cu2+ ions in Eu2CuO4 and La2CuO4 crystals. Phys. Solid State 39, 1425–1432 (1997). https://doi.org/10.1134/1.1130151
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.1130151