The singlet-triplet magnetism and induced spin fluctuations in the high-T-c copper oxides / Moskvin AS,Ovchinnikov AS // PHYSICA C. - 1998. - V. 296, l. 3-4. - P. 250-268.

ISSN/EISSN:

0921-4534 / нет данных

Type:

Article

Abstract:

High-T-c cuprates such as La2-xSrxCuO4 and YBa2-xCu3O6+x are considered as a system of the election and hole polar pseudo-Jahn-Teller CuO4 centers {[}CuO47-](JT) and {[}CuO45-](JT), respectively, or a system of the local bosons moving in a lattice of the hole centers. Ground manifold of the polar centers includes three terms (1)A(1g) (Zhang-Rice singlet). E-1(u), E-3(u) with different spin multiplicity, orbital degeneracy and parity that provides an unconventional multi-mode behavior of the cuprates. The spin subsystem of the copper oxides within the polar John-Teller CuO4 centers model is a two-component spin liquid and corresponds to a singlet-triplet magnet with, in general, multiparametric non-collinear spin configurations. In the framework of a modified mean field approximation some kinds of spin ordering are discussed including as a trivial singlet or triplet states as a pure quantum singlet-triplet mixed state. A local boson movement is accompanied by a modulation of the spin density on the site resulting in the so-called induced spin fluctuations. Some unconventional features of the induced spin fluctuations are considered including an appearance of the induced longitudinal ferrimagnetism with an appropriate contribution to the spin susceptibility. a possibility to observe and examine the charge fluctuations with the help of the traditional magnetic methods such as the magnetic inelastic neutron scattering and the spin lattice relaxation experiments. The suggested model, in comparison with the nearly antiferromagnetic Fermi-liquid model. represents a new to the description of the spin system of the high-T-c cuprates. (C) 1998 Elsevier Science B.V.

Author keywords:

copper oxides; singlet-triplet magnet; induced spin fluctuations SUPERCONDUCTING LA2-XSRXCUO4; NEUTRON-SCATTERING; NORMAL-STATE; LA-139 NQR; SUSCEPTIBILITY; LA(2-X)SR(X)CUO4; EXCITATIONS; TEMPERATURE; RELAXATION; YBA2CU3OX

DOI:

10.1016/S0921-4534(97)01843-1

Web of Science ID:

ISI:000073345200011

Соавторы в МНС:

Другие поля

Поле	Значение
Month	FEB 20
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	SUPERCONDUCTING LA2-XSRXCUO4; NEUTRON-SCATTERING; NORMAL-STATE; LA-139 NQR; SUSCEPTIBILITY; LA(2-X)SR(X)CUO4; EXCITATIONS; TEMPERATURE; RELAXATION; YBA2CU3OX
Research-Areas	Physics
Web-of-Science-Categories	Physics, Applied
ORCID-Numbers	Ovchinnikov, Alexander/0000-0002-1173-9260
Number-of-Cited-References	30
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	4
Journal-ISO	Physica C
Doc-Delivery-Number	ZK636