Heat capacity studies in RPd2Al3 (R = Ce, Pr, Nd and Sm) systems

Ghosh, K. ; Ramakrishnan, S. ; Chinchure, Aravind D. ; Marathe, V. R. ; Chandra, Girish (1996) Heat capacity studies in RPd2Al3 (R = Ce, Pr, Nd and Sm) systems Physica B: Condensed Matter, 223-224 . pp. 354-358. ISSN 0921-4526

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0921-4526(96)00121-4

Abstract

In this paper we report the results of low-temperature (from 1.7 to 40 K) heat-capacity studies in RPd2Al3 (R = Ce, Pr, Nd and Sm). Our heat-capacity data on CePd2Al3 and SmPd2Al3 agree with those of the previous studies. A λ-type anomaly is observed at 6.0 K for NdPd2Al3. A large jump (11 J/mol K) in heat-capacity data near the magnetic transition temperature confirms the bulk magnetic ordering in NdPd2Al3. The data for PrPd2Al3 do not show any magnetic ordering down to 1.7 K. We have calculated the magnetic contribution of entropy due to 4f electrons of all the samples. The temperature dependence of entropy in PrPd2Al3 indicates a nonmagnetic singlet ground state. The magnetic contribution to the entropy for all samples at 40 K is less than the corresponding free ion entropy values (R ln(2J + 1)). This suggests that there is a large crystal-field contribution to the heat-capacity in this series.

Item Type:Article
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ID Code:68548
Deposited On:02 Nov 2011 11:33
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