True charge-transfer gap in parent insulating cuprates / Moskvin A. S. // PHYSICAL REVIEW B. - 2011. - V. 84, l. 7.

ISSN/EISSN:

2469-9950 / 2469-9969

Type:

Article

Abstract:

A large body of experimental data points toward a charge-transfer (CT) instability of parent insulating cuprates to be their unique property. It is argued that the true CT gap in these compounds is as small as 0.4-0.5 eV rather than 1.5-2.0 eV as usually derived from the optical gap measurements. In fact we deal with a competition of the conventional (3d(9)) ground state and a CT state with the formation of electron-hole dimers which evolves under doping to an unconventional bosonic system. My conjecture does provide an unified standpoint on the main experimental findings for parent cuprates including linear and nonlinear optical, Raman, photoemission, photoabsorption, and transport properties related with the CT excitations. In addition I suggest a scenario for the evolution of the CuO2 planes in the CT unstable cuprates under nonisovalent doping.

Author keywords:

JAHN-TELLER-CENTERS; SINGLET-TRIPLET MAGNETISM; LAMELLAR COPPER OXIDES; ELECTRON-ENERGY-LOSS; T-C SUPERCONDUCTORS; PHASE-SEPARATION; PHOTOEMISSION-SPECTROSCOPY; OPTICAL NONLINEARITY; SKYRMION LATTICE; MOTT INSULATOR

DOI:

10.1103/PhysRevB.84.075116

Web of Science ID:

ISI:000293618900003

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	AUG 8
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	075116
EISSN	2469-9969
Keywords-Plus	JAHN-TELLER-CENTERS; SINGLET-TRIPLET MAGNETISM; LAMELLAR COPPER OXIDES; ELECTRON-ENERGY-LOSS; T-C SUPERCONDUCTORS; PHASE-SEPARATION; PHOTOEMISSION-SPECTROSCOPY; OPTICAL NONLINEARITY; SKYRMION LATTICE; MOTT INSULATOR
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Funding-Acknowledgement	RFBR {[}10-02-96032]
Funding-Text	RFBR Grant No. 10-02-96032 is acknowledged for financial support.
Number-of-Cited-References	96
Usage-Count-Since-2013	13
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	803YL