Interplay between magnetism, charge localization, and structure in Sr14-xCaxCu24O41

被引:32
作者
Ammerahl, U
Büchner, B
Colonescu, L
Gross, R
Revcolevschi, A
机构
[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
[2] Univ Paris 11, Lab Chim Solides, F-91405 Orsay, France
来源
PHYSICAL REVIEW B | 2000年 / 62卷 / 13期
关键词
D O I
10.1103/PhysRevB.62.8630
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Measurements of the thermal expansion of Sr14-xCaxCu24O41 (0 less than or equal to x less than or equal to 12) single crystals were performed. At low temperature and small x we observe anomalous magnetic contributions which are ascribed to the formation of the spin gap state in the chains. From our data we derive a positive pressure derivative of the spin gap and we show that the dimers are formed by next nearest Cu neighbors. Additional anomalous contributions to the thermal expansion are attributed to a low-dimensional charge order occurring at higher temperature. The relevance of the charge order for the spin gap formation is discussed.
引用
收藏
页码:8630 / 8633
页数:4
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