Wilson Ratio of a Tomonaga-Luttinger Liquid in a Spin-1/2 Heisenberg Ladder

被引：53

作者：

Ninios, K. ^{[1
,2
]}

Hong, Tao ^{[3
]}

Manabe, T. ^{[4
]}

Hotta, C. ^{[4
]}

Herringer, S. N. ^{[5
,6
]}

Turnbull, M. M. ^{[5
,6
]}

Landee, C. P. ^{[5
,6
]}

Takano, Y. ^{[1
]}

Chan, H. B. ^{[2
]}

机构：

[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[2] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China

[3] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[4] Kyoto Sangyo Univ, Fac Sci, Dept Phys, Kyoto 6038555, Japan

[5] Clark Univ, Carlson Sch Chem, Worcester, MA 01610 USA

[6] Clark Univ, Dept Phys, Worcester, MA 01610 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 09期

关键词：

SYSTEMS; MODEL; GAS;

D O I：

10.1103/PhysRevLett.108.097201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using micromechanical force magnetometry, we have measured the magnetization of the strong-leg spin-1/2 ladder compound (C7H10N)(2)CuBr2 at temperatures down to 45 mK. Low-temperature magnetic susceptibility as a function of field exhibits a maximum near the critical field H-c at which the magnon gap vanishes, as expected for a gapped one-dimensional antiferromagnet. Above H-c a clear minimum appears in the magnetization as a function of temperature, as predicted by theory. In this field region, the susceptibility in conjunction with our specific-heat data yields the Wilson ratio R-W. The result supports the relation R-W = 4K, where K is the Tomonaga-Luttinger-liquid parameter.

引用

页数：5

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