Specific heat at the spin-peierls transition in CuGeO3 under magnetic fields up to 22 tesla |
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| Authors: | G. Reményi S. Sahling J. C. Lasjaunias N. Hegman J. P. Brison A. I. Buzdin G. Dhalenne A. Revcolevschi |
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| Affiliation: | (1) Centre de Recherches sur les Très Basses Températures, associé à l'Université Joseph Fourier, BP 166, 38042 Grenoble-Cédex 9, France;(2) Laboratoire des Champs Magnétiques Intenses, C.N.R.S., BP 166, 38042 Grenoble-Cédex 9, France;(3) Département de Recherche Fondamentale sur la Matière Condensée, SPSMS, CEA, C.E.N.G., 17 rue des Martyrs, 38054 Grenoble-Cédex 9, France;(4) Laboratoire de Chimie des Solides, URA 446 CNRS, Université Paris-Sud, 91405 Orsay-Cédex, France;(5) Present address: Institut für Tieftemperaturphysik, TU Dresden, D-01062, Germany;(6) Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary |
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| Abstract: | We report on heat capacity measurements of the spin-Peierls compound CuGeO3 under magnetic fields between 0 and 22 teslas. We have determined the magnetic phase diagram between the three different phases (U=uniform,I=incommensurate,D=dimerised) of this system, unknown up to now forH>14 T, and which can be well interpreted within the Hartree-Fock approximation. We have studied the 2nd order phase transition forH=const. at the crossing ofD-U andI-U phases. The spin-Peierls transition gives rise to a well pronounced specific heat jump. The phase diagram and the specific heat results are discussed in the framework of a B.C.S.-like theoretical model. |
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