Enhanced electron-lattice coupling in La1-xSrxMnO3 near the metal-insulator phase boundary

被引：105

作者：

Moritomo, Y

Asamitsu, A

Tokura, Y

机构：

[1] NAGOYA UNIV, CTR INTEGRATED RES SCI & ENGN, NAGOYA, AICHI 46401, JAPAN

[2] UNIV TOKYO, DEPT APPL PHYS, TOKYO 113, JAPAN

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.56.12190

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Effects of hydrostatic pressure on the magnetic and transport properties have been investigated for melt-grown crystals of La1-xSrxMnO3 with a finely-controlled doping level x near the metal-insulator phase boundary. Application of pressure affects the critical temperatures for the orthorhombic-rhombohedral structural transition (T-s) as well as for the metal-insulator transition (T-MI) that has been interpreted in terms of an ordering of the Jahn-Teller polarons. Reflecting that the kinetic energy of the e(g) carriers sensitively depends on the degree of the lattice distortion, T-s shows an abrupt decrease under pressure when it crosses the magnetic phase boundary. On the other hand, T-MI is significantly suppressed under pressure via enhanced e(g)-electron hopping. These pressure effects are compared with those of an external magnetic field.

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页码：12190 / 12195

页数：6

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