NMR evidence for a "Generalized spin-peierls transition" in the high-magnetic-field phase of the spin ladder Cu2(C5H12N2)2Cl4

被引：44

作者：

Mayaffre, H

Horvatic, M

Berthier, C

Julien, MH

Ségransan, P

Lévy, L

Piovesana, O

机构：

[1] Univ Grenoble 1, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France

[2] CNRS, High Field Magnet Lab, F-38042 Grenoble 09, France

[3] MPI, FKF, F-38042 Grenoble 09, France

[4] Univ Grenoble 1, Inst France, F-38402 St Martin Dheres, France

[5] Univ Perugia, Dipartimento Chim, I-06100 Perugia, Italy

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.85.4795

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic-field-induced 3D ordered phase of the two-leg spin ladder Cu-2(C5H12N2)(2)Cl-4 has been probed through measurements of H-1 NMR spectra and 1/T-1 in the temperature range 70 mK-1.2 K. The second order transition line T-c(H) has been determined between H-c1 = 7.52 T and H-c2 = 13.5 T and varies as (H - H-c1)(2/3) close to H-c1. From the observation of anomalous shifts and a crossover in 1/T1 above T-c, the mechanism of the 3D transition is argued to be magnetoelastic as in spin-Peierls chains, here involving a displacement of the protons along the longitudinal exchange (J(parallel to)) path.

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页码：4795 / 4798

页数：4

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