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Electrical resistivity and magnetization measurements on the heavy fermion superconductor PrOs4Sb12

P. -C. Ho·N. A. Frederick·V. S. Zapf·E. D. Bauer·T. D. Do·M. B. Maple·A. D. Christianson·A. H. Lacerda
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Abstract

The filled skutterudite compound PrOs4Sb12, the first example of a Pr-based heavy fermion superconductor, displays superconductivity with $T_c\sim 1.85$ K and has an effective mass $m^* \sim$ {50 $m_e$}, where $m_e$ is the free electron mass. For magnetic fields above 4.5 T, sharp features in the normal state electrical resistivity, magnetization, specific heat, and thermal expansion data suggest the occurrence of a phase transition at high fields. This high field ordered phase in the normal state may originate from a combination of crystalline electric field enhanced Zeeman splitting and quadrupolar ordering. We present an investigation of the electrical resistivity and magnetization of PrOs4Sb12 as a function of temperature between {350 mK} and {3.5 K} and magnetic field up to {18 T}. The data reveal a detailed phase boundary of the high field ordered phase as well as the lower critical field $H_{c1}$ and the onset field of the peak effect in the superconducting state of PrOs4Sb12.

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P. -C. Ho, N. A. Frederick, V. S. Zapf, E. D. Bauer, T. D. Do, M. B. Maple, A. D. Christianson, A. H. Lacerda. 2003-03-20. Electrical resistivity and magnetization measurements on the heavy fermion superconductor PrOs4Sb12. https://arxiv.org/abs/cond-mat/0303405

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