Perspectives of disproportionation driven superconductivity in strongly correlated 3d compounds / Moskvin A. S. // JOURNAL OF PHYSICS-CONDENSED MATTER. - 2013. - V. 25, l. 8.

ISSN/EISSN:

0953-8984 / 1361-648X

Type:

Article

Abstract:

Disproportionation in 3d compounds can give rise to an unconventional electron-hole Bose liquid with a very rich phase diagram, from a Bose metal, to a charge ordering insulator and an inhomogeneous Bose-superfluid. Optimal conditions for disproportionation driven high-T-c superconductivity are shown to be realized only for several Jahn-Teller d(n) configurations that permit the formation of well defined local composite bosons. These are the high-spin d(4), low-spin d(7), and d(9) configurations given the octahedral crystal field, and the d(1), high-spin d(6) configurations given the tetrahedral crystal field. The disproportionation reaction has a peculiar `anti-Jahn-Teller' character lifting the bare orbital degeneracy. Superconductivity in the d(4) and d(6) systems at variance with d(1), d(7), and d(9) systems implies unavoidable coexistence of the spin-triplet composite bosons and the magnetic lattice. We argue that unconventional high-T-c superconductivity, observed in quasi-2d cuprates with tetragonally distorted CuO6 octahedra and iron-based layered pnictides/chalcogenides with tetrahedrally coordinated Fe2+ ions presents a key argument to support the fact that the disproportionation scenario is at work in these compounds.

Author keywords:

SINGLET-TRIPLET MAGNETISM; JAHN-TELLER-CENTERS; PHASE-SEPARATION; CHARGE DISPROPORTIONATION; COPPER OXIDES; TRANSITION; INSULATOR; CRYSTALS; DIAGRAM; LIQUID

DOI:

10.1088/0953-8984/25/8/085601

Web of Science ID:

ISI:000314780400020

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	FEB 27
Publisher	IOP PUBLISHING LTD
Address	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Language	English
Article-Number	085601
EISSN	1361-648X
Keywords-Plus	SINGLET-TRIPLET MAGNETISM; JAHN-TELLER-CENTERS; PHASE-SEPARATION; CHARGE DISPROPORTIONATION; COPPER OXIDES; TRANSITION; INSULATOR; CRYSTALS; DIAGRAM; LIQUID
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	alexandr.moskvin@usu.ru
Funding-Acknowledgement	RFBR {[}10-02-96032, 12-02-01039]
Funding-Text	The RFBR grants Nos. 10-02-96032 and 12-02-01039 are acknowledged for providing financial support.
Number-of-Cited-References	74
Usage-Count-Since-2013	28
Journal-ISO	J. Phys.-Condes. Matter
Doc-Delivery-Number	087RR