Anomalous optical properties of the mixed-valent lithium cuprate LiCu2O2 / Pisarev R. V.,Moskvin A. S.,Kalashnikova A. M.,Bush A. A.,Rasing Th. // PHYSICAL REVIEW B. - 2006. - V. 74, l. 13.

ISSN/EISSN:

1098-0121 / нет данных

Type:

Article

Abstract:

We show that the optical properties of LiCu1+Cu2+O2 in the spectral range of 0.6-5.8 eV radically differ from those of all other known Cu1+, Cu2+, and mixed-valent oxide cuprates. An extremely strong, sharp, and highly anisotropic optical feature with epsilon(xx)(2)=26 is observed at 3.27 eV which we assign to an excitonlike transition in the O2--Cu1+-O2- dumbbells. Our findings thoroughly disagree with reported ab initio calculations and can be explained by an exciton-type model that includes strong electron-hole correlations and a crystal-field splitting of the Cu1+ states. The excitonic effects in LiCu2O2 appear strongly enhanced due to the shortening of the dumbbell lattice spacing which is the shortest one among known cuprates. Our experimental data along with the model reveal a previously unknown regularity in the electronic structure of cuprates.

Author keywords:

ELECTRONIC-STRUCTURE; COPPER OXIDES; STATES

DOI:

10.1103/PhysRevB.74.132509

Web of Science ID:

ISI:000241723200025

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	OCT
Publisher	AMERICAN PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	132509
Keywords-Plus	ELECTRONIC-STRUCTURE; COPPER OXIDES; STATES
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	pisarev@mail.ioffe.ru
ResearcherID-Numbers	Alexandr, Bush/R-2287-2016 Kalashnikova, Alexandra/C-7821-2014 Rasing, Theo/D-5207-2012
ORCID-Numbers	Alexandr, Bush/0000-0003-3990-9847 Kalashnikova, Alexandra/0000-0001-5635-6186
Number-of-Cited-References	19
Usage-Count-Since-2013	6
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	101EY