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High-field magnetic phases of a two-leg spin ladder: Cu2(C5H12N2)2Cl4 |
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| Authors: | G. Chaboussant, M. -H. Julien, Y. Fagot-Revurat, H. Mayaffre, M. Horvati, L. P. L vy, C. Berthier,O. Piovesana |
| Affiliation: | a Grenoble High Magnetic Field Laboratory, CNRS and MPI-FKF, BP 166, F-38042 Grenoble, France b Laboratoire de Spectrométrie Physique, Univ. J. Fourier, BP 87, F-38402 St Martin d'Hères, France c Dipartimento di Chimica, Università di Perugia, I-06100 Perugia, Italy |
| Abstract: | CHCupCl is a two-leg spin-ladder where the Cu++ ions are coupled by superexchange. Its magnetic properties change dramatically as a function of a magnetic field. Below the critical field Hc1, there is a singlet ground state separated from the triplet excited state by an energy gap. Between Hc1 and Hc2, several magnetic phases have been observed. Above 1 K, dynamical studies reveal a disordered quantum critical phase. At lower temperatures, a 3-D ordered phase has been observed in specific heat and NMR studies. New NMR results on the 3D-ordered and quantum critical phases are presented in this short report. |
| Keywords: | High magnetic field NMR Quantum critical behavior Spin-ladders |
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