Hole distribution in (Sr,Ca,Y,La)14Cu24O41 ladder compounds studied by x-ray absorption spectroscopy

被引：107

作者：

Nücker, N

Merz, M

Kuntscher, CA

Gerhold, S

Schuppler, S

Neudert, R

Golden, MS

Fink, J

Schild, D

Stadler, S

Chakarian, V

Freeland, J

Idzerda, YU

Conder, K

Uehara, M

Nagata, T

Goto, J

Akimitsu, J

Motoyama, N

Eisaki, H

Uchida, S

Ammerahl, U

Revcolevschi, A

机构：

[1] Forschungszentrum Karlsruhe, IFP, D-76021 Karlsruhe, Germany

[2] Inst Festkorper& Werkstofforsch Dresden, D-01171 Dresden, Germany

[3] Forschungszentrum Karlsruhe, INE, D-76021 Karlsruhe, Germany

[4] USN, Res Lab, Washington, DC 20375 USA

[5] Swiss Fed Inst Technol, Festkorperphys Lab, CH-8093 Zurich, Switzerland

[6] Aoyama Gakuin Univ, Dept Phys, Setagaya Ku, Tokyo 1578572, Japan

[7] Univ Tokyo, Dept Supercond, Bunkyo Ku, Tokyo 1130033, Japan

[8] Univ Paris Sud, Lab Physicochim Solides, F-91405 Orsay, France

[9] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.62.14384

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The unoccupied electronic structure for the Sr14Cu24O41 family of two-leg ladder compounds was investigated for different partial substitutions of Sr2+ by Ca2+, leaving the nominal hole count constant, and by Y3+ or La3+, reducing the nominal hole count from its full value of 6 per formula unit. Using polarization-dependent x-ray absorption spectroscopy on single crystals, hole states on both the chain and ladder sites could be studied. While for intermediate hole counts all holes reside on O sites of the chains, a partial hole occupation on the ladder sites in orbitals oriented along the legs is observed for the fully doped compound Sr14Cu24O41. On Substitution of Ca for Sr orbitals within the ladder planes but perpendicular to the legs receive some hole occupation as well.

引用

页码：14384 / 14392

页数：9

共 48 条

[1] Doping effects in the Sr14Cu24O41-type structure: A Raman scattering study [J].