Field-induced gap in a quantum spin-1/2 chain in a strong magnetic field

被引：20

作者：

Zvyagin, S. A. ^{[1
]}

Cizmar, E. ^{[2
]}

Ozerov, M. ^{[1
]}

Wosnitza, J. ^{[1
]}

Feyerherm, R. ^{[3
]}

Manmana, S. R. ^{[4
,5
,6
,7
]}

Mila, F. ^{[7
]}

机构：

[1] Helmholtz Zentrum Dresden Rossendorf, Dresden High Magnet Field Lab, D-01314 Dresden, Germany

[2] Safarik Univ, Ctr Low Temp Phys, SK-04154 Kosice, Slovakia

[3] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

[4] Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA

[5] Natl Inst Stand & Technol, Joint Inst Lab Astrophys, Boulder, CO 80309 USA

[6] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[7] Ecole Polytech Fed Lausanne, Inst Theoret Phys, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 06期

关键词：

FLUCTUATIONS;

D O I：

10.1103/PhysRevB.83.060409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic excitations in copper pyrimidine dinitrate, a spin-1/2 antiferromagnetic chain with alternating g-tensor and Dzyaloshinskii-Moriya interactions that exhibits a field-induced spin gap, are probed by means of pulsed-field electron-spin-resonance spectroscopy. In particular, we report on a minimum of the gap in the vicinity of the saturation field H-sat = 48.5 T associated with a transition from the sine-Gordon region (with soliton-breather elementary excitations) to a spin-polarized state (with magnon excitations). This interpretation is fully confirmed by the quantitative agreement over the entire field range of the experimental data with the density matrix renormalization group calculations for a spin-1/2 Heisenberg chain with a staggered transverse field.

引用

页数：4

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