Magnetic field influence on the low temperature heat capacity of the spin-Peierls compound CuGeO3 |
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Authors: | JC Lasjaunias S Sahling A Revcolevschi |
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Institution: | a Centre de Recherches sur les Très Basses Températures-CNRS, Laboratoire associé à l'Université Joseph Fourier, BP 166, 38042 Grenoble cedex 9, France b Institut für Festkörperphysik, IFP, Technische Universität Dresden, D-01069 Dresden, Germany c Laboratoire de Physico-Chimie de l'Etat Solide, Université de Paris-Sud, Bat. 414, 91405 Orsay, France |
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Abstract: | We have investigated the effect of magnetic field on the low-temperature heat capacity Cp of the undoped spin-Peierls inorganic compound CuGeO3 in the dimerized phase. Below 1 K, Cp is dominated by a Schottky anomaly, which is removed above 1 K for field B higher than 3 T. This anomaly is well accounted for by a molar concentration x=0.75×10−3 of intrinsic defects, which occur predominantly on the Cu chains. This amount is confirmed by magnetization measurements. A second contribution, varying as T−ν with ν=1 or 2, rises up with the field for B>1 T in the lower temperature range (from 70 mK to 0.3 K). At high field this contribution becomes very sensitive to the experimental dynamics. |
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Keywords: | 65 40 b 75 40 Cx 75 30 Hx 75 10 Pq |
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