Spin-1/2 XXZ Chain System Cs2CoCl4 in a Transverse Magnetic Field

被引：40

作者：

Breunig, O. ^{[1
]}

Garst, M. ^{[2
]}

Sela, E. ^{[2
,3
]}

Buldmann, B. ^{[2
]}

Becker, P. ^{[4
]}

Bohaty, L. ^{[4
]}

Mueller, R. ^{[1
]}

Lorenz, T. ^{[1
]}

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] Univ Cologne, Inst Theoret Phys, D-50937 Cologne, Germany

[3] Tel Aviv Univ, Raymond & Beverly Sackler Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[4] Univ Cologne, Inst Kristallog, D-50939 Cologne, Germany

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 18期

关键词：

QUANTUM; MODEL; ORDER;

D O I：

10.1103/PhysRevLett.111.187202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Comparing high-resolution specific heat and thermal expansion measurements to exact finite-size diagonalization, we demonstrate that Cs2CoCl4 for a magnetic field along the crystallographic b axis realizes the spin-1/2 XXZ chain in a transverse field. Exploiting both thermal as well as virtual excitations of higher crystal-field states, we find that the spin chain is in the XY limit with an anisotropy J(z)/J(perpendicular to) approximate to 0.12, substantially smaller than previously believed. A spin-flop Ising quantum phase transition occurs at a critical field of mu H-0(b)cr approximate to 2 T before around 3.5 T the description in terms of an effective spin-1/2 chain becomes inapplicable.

引用

页数：5

共 23 条

[21] Universal signatures of the metamagnetic quantum critical endpoint: Application to CeRu2Si2 [J].