Pressure-tuned collapse of the Mott-like state in Can+1RunO3n+1 (n=1,2):: Raman spectroscopic studies -: art. no. 226401

被引：64

作者：

Snow, CS

Cooper, SL

Cao, G

Crow, JE

Fukazawa, H

Nakatsuji, S

Maeno, Y

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[2] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA

[3] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA

[4] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[5] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[6] Japan Sci & Technol Corp, CREST, Tsukuba, Ibaraki, Japan

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.89.226401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a Raman scattering study of the pressure-induced collapse of the Mott-like phases of Ca3Ru2O7 (T-N=56 K) and Ca2RuO4 (T-N=110 K). The pressure dependence of the phonon and two-magnon excitations in these materials indicate (i) a Tsimilar to0 pressure-induced collapse of the antiferromagnetic (AF) insulating phase above P(*)similar to55 kbar in Ca3Ru2O7 and P(*)similar to5-10 kbar in Ca2RuO4, (ii) a remarkable insensitivity of the exchange interaction to pressure in both systems, and (iii) evidence for persistent AF correlations above the critical pressure of Ca2RuO4, suggestive of phase separation involving AF insulator and ferromagnetic metal phases.

引用

页数：4

共 27 条

[1] Orbital-selective Mott-insulator transition in Ca2-xSrxRuO4 [J].