Effect of Magnetic Field on the Induced Magnetic Moment System Pr$_{3}$In.

ORAL

Abstract

Pr$_{3}$In is a singlet-triplet system similar to the classic induced moment system Pr$_{3}$Tl, with identical crystal structure. Both materials order magnetically at similar temperatures (T$_{C}$=11.6 K for Pr$_{3}$Tl and T$_{N}$=11.4 K for Pr$_{3}$In). The magnetic order is antiferromagnetic (AF) in Pr$_{3}$In as opposed to ferromagnetic in Pr$_{3}$Tl. The exchange interaction between Pr sites causes admixture of the crystal field triplet excited state into the singlet ground state, resulting in induced moment magnetic order below T$_{N}$. Application of a magnetic field can change the energies of the singlet and triplet in such a manner as to alter the admixture. We have measured magnetization, magnetoresistance, specific heat and magneto-caloric effect in the range 0 to 15 T. We observed a phase transition below 11 K and at magnetic field of order 1.9 T. At present, whether this is a spin rearrangement or a spin polarized phase remains an open question. It would be surprising for the 1.9 T transition to be to a spin polarized state, given that T$_{N}$ is around 11.4 K. In addition, at high fields, we observe a strong reduction of the specific heat as the AF interactions are suppressed and the system reverts to a crystal-field-only behavior.

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Authors

  • Victor Fanelli

    University of California Irvine

  • Andrew Christianson

    Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA, Oak Ridge National Laboratory

  • M. Jaime

    National High Magnetic Field Laboratory, Los Alamos National Laboratory, MPA-NHMFL, LANL, NHMFL-LANL, National High Magnetic Field Laboratory, LANL, Los Alamos, NM, MPA-NHMFL, LANL, Los Alamos, NM 87544

  • Joe Thompson

    Los Alamos National Laboratory, Condensed Matter and Thermal Physics, MPA, Los Alamos National Laboratory, Los Alamos, NM, Condensed Matter and Thermal Physics, Los Alamos National Laboratory, USA, Los Alamos National Lab., MPA-CMTP, LANL, Los Alamos National Lab, Los Alamos Nat. Lab.

  • Cristian Batista

    Los Alamos National Laboratory, Los Alamos National Lab, T-Division, Los Alamos National Laboratory, T-11, LANL

  • Jon Lawrence

    University of California Irvine