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