Observation of a metallic antiferromagnetic phase and metal to nonmetal transition in Ca3Ru2O7

被引：183

作者：

Cao, G ^{[1
]}

McCall, S ^{[1
]}

Crow, JE ^{[1
]}

Guertin, RP ^{[1
]}

机构：

[1] TUFTS UNIV, DEPT PHYS, MEDFORD, MA 02155 USA

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.78.1751

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Single crystal Ca3Ru2O7 shows a metallic antiferromagnetic phase intermediate between a first-order metal to nonmetal transition at T-M = 48 K and the antiferromagnetic ordering (Neel) temperature, T-N = 56 K. The metallic antiferromagnetic phase is predicted within various Mott-Hubbard models. Magnetization and electrical resistivity reveal strongly anisotropic metamagnetism in the nonmetallic antiferromagnetic phase. The charge and spin excitations are strongly coupled: The H-T phase diagrams determined by magnetization and magnetoresistivity are indistinguishable and reveal a multicritical point. The heat capacity of Ca3Ru2O7 suggests it is a highly correlated electron system.

引用

页码：1751 / 1754

页数：4

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