NMR evidence for a "generalized spin-Peierls transition" in the high magnetic field phase of the spin-ladder Cu2(C5N2H12)2Cl4

C. Berthier; H. Mayaffre; L. Levy; M.-H. Julien; M. Horvatic; O. Piovesana; P. Segransan

arxiv: cond-mat/0003361 · v1 · submitted 2000-03-22 · ❄️ cond-mat.str-el

NMR evidence for a "generalized spin-Peierls transition" in the high magnetic field phase of the spin-ladder Cu2(C5N2H12)2Cl4

H. Mayaffre , M. Horvatic , C. Berthier , M.-H. Julien , P. Segransan , L. Levy , O. Piovesana This is my paper

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keywords transitionbeenc5n2h12magneticphasespin-ladderabovealong

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The magnetic field-induced 3D ordered phase of the two-leg spin-ladder Cu2(C5N2H12)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 = 7.52 T and Hc2 = 13 T 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, involving a displacement of the protons along the longitudinal exchange (J//) path.

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NMR evidence for a "generalized spin-Peierls transition" in the high magnetic field phase of the spin-ladder Cu2(C5N2H12)2Cl4

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