Thermodynamic and electron diffraction signatures of charge and spin ordering in La1-xCaxMnO3

被引：460

作者：

Ramirez, AP ^{[1
]}

Schiffer, P ^{[1
]}

Cheong, SW ^{[1
]}

Chen, CH ^{[1
]}

Bao, W ^{[1
]}

Palstra, TTM ^{[1
]}

Gammel, PL ^{[1
]}

Bishop, DJ ^{[1
]}

Zegarski, B ^{[1
]}

机构：

[1] UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.76.3188

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The large-magnetoresistance compounds La1-xCaxMnO3 have been studied using specific heat, sound velocity (upsilon), and electron diffraction. For 0.63 less than or equal to x less than or equal to 0.67 charge ordering is observed at 260 K and accompanied by a dramatic (>10%) increase in upsilon. This simultaneous occurrence of electron and lattice ordering features implies extremely strong electron-phonon coupling, known to exist for the octahederally coordinated d(4) ion and originating in the Jahn-Teller effect. A dynamic manifestation of this Jahn-Teller coupling has been suggested by Millis et al. as the origin for colossal magnetoresistance.

引用

页码：3188 / 3191

页数：4

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