Specific heat in different magnetic phases of RNi2B2C (R= Gd, Ho, Er): theory and experiment

Details Specific heat in different magnetic phases of RNi2B2C (R= Gd, Ho, Er): theory and experiment Specific heat in different magnetic phases of RNi2B2C (R= Gd, Ho, Er): theory and experiment

2008-12-27

arxiv.org/abs/0812.4722v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

The borocarbides RNi2B2C (R=Gd, Ho, Er) exhibit a large variety of magnetic states and as a consequence rich phase diagrams. We have analyzed the nature of these states by specific heat investigations. The data were measured down to 0.5 K and up to 80 kOe. The overall evolution of each Cm(T,H) curve is observed to reflect faithfully the features of the corresponding H-T phase diagram. Within the lower ranges of temperature and fields, the calculations based on linearized field-dependent spin-wave theory are found to reproduce satisfactorily the measured Cm(T,H) curves: accordingly, within these ranges, the thermodynamical properties of these compounds can be rationalized in terms of only two parameters: the spin-wave energy gap and the stiffness coefficient. For the intermediate fields ranges (H1

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