Universität zu Köln

Streltsov, S. V. and Khomskii, D. I. (2017). Orbital physics in transition metal compounds: new trends. Phys. Usp., 60 (11). S. 1121 - 1147. BRISTOL: TURPION LTD. ISSN 1468-4780

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Abstract

The present review discusses different effects related to orbital degrees of freedom. Leaving aside such aspects as the superexchange mechanism of cooperative Jahn-Teller distortions and various properties of 'Kugel-Khomskii'-like models, we mostly concentrate on other phenomena, which are the focus of modern condensed matter physics. After a general introduction, we start with a discussion of the concept of effective reduction of dimensionality due to orbital degrees of freedom and consider such phenomena as the orbitally driven Peierls effect and the formation of small clusters of ions in the vicinity of the Mott transition, which behave like 'molecules' embedded in a solid. The second large part is devoted to orbital-selective effects, such as the orbital-selective Mott transition and the suppression of magnetism due to the fact that the electrons on some orbitals start to form singlet molecular orbitals. At the end, the rapidly growing field of so-called 'spin-orbit-dominated' transition metal compounds is briefly reviewed, including such topics as the interplay between the spin orbit coupling and the Jahn-Teller effect, the formation of the spin orbit-driven Mott and Peierls states, the role of orbital degrees of freedom in generating the Kitaev exchange coupling, and the singlet (excitonic) magnetism in 4d and 5d transition metal compounds.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Streltsov, S. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, D. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-211630
DOI:	10.3367/UFNe.2017.08.038196
Journal or Publication Title:	Phys. Usp.
Volume:	60
Number:	11
Page Range:	S. 1121 - 1147
Date:	2017
Publisher:	TURPION LTD
Place of Publication:	BRISTOL
ISSN:	1468-4780
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGNETIC-PROPERTIES; DOUBLE-EXCHANGE; ELECTRONIC-STRUCTURE; PHASE-TRANSITION; BA3MRU2O9 M; CRYSTAL; DENSITY; SUPERCONDUCTIVITY; MODEL; STATE Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21163