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APS » Journals » Phys. Rev. Lett. » Volume 85 » Issue 22
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Phys. Rev. Lett. 85, 4795–4798 (2000)

NMR Evidence for a “Generalized Spin-Peierls Transition” in the High-Magnetic-Field Phase of the Spin Ladder Cu2(C5H12N2)2Cl4

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H. Mayaffre1, M. Horvatić2, C. Berthier1,2, M.-H. Julien1, P. Ségransan1, L. Lévy2,3, and O. Piovesana4
1Laboratoire de Spectrométrie Physique, Université J. Fourier, BP 87, F-38402 St. Martin d'Hères, France
2Grenoble High Magnetic Field Laboratory, CNRS and MPI-FKF, BP 166, F-38042 Grenoble Cedex 09, France
3Institut Universitaire de France, Université J. Fourier, BP 41, F-38402 St. Martin d'Hères, France
4Dipartimento di Chimica, Universitá di Perugia, I-06100 Perugia, Italy

Received 7 March 2000; published in the issue dated 27 November 2000

The magnetic-field-induced 3D ordered phase of the two-leg spin ladder Cu2(C5H12N2)2Cl4 has been probed through measurements of 1H NMR spectra and 1/T1 in the temperature range 70 mK–1.2 K. The second order transition line Tc(H) has been determined between Hc1 = 7.52T and Hc2 = 13.5T and varies as (H-Hc1)2/3 close to Hc1. From the observation of anomalous shifts and a crossover in 1/T1 above Tc, 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∥) path.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.4795
DOI:
10.1103/PhysRevLett.85.4795
PACS:
75.10.Jm, 75.40.Cx, 76.60.-k
 
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