Infrared-active excitations related to the $R^{3+}$ ligand-field splitting in $R$Mn$_{2}$O$_{5 }(R$=Ho, Dy, Tb)

ORAL

Abstract

Optical transitions between ligand-field split states of $R^{3+}$ ions in $R$Mn$_{2}$O$_{5}$ multiferroic single crystals have been studied at the phase transitions in the external magnetic field up to 13 T and uniaxial pressure up to 5 kbar. Spectra of the ligand field excitations change significantly in external magnetic field and correlate with the reversal of electric polarization induced by magnetic field. The oscillator strength and selection rules for ligand field excitations change with external uniaxial pressure. We discuss the connection between the ligand field on $R^{3+}$ with the magnetism and dielectric properties of this compounds.

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Authors

  • Andrei Sirenko

    New Jersey Institute of Technology, Physics Department, New Jersey Institute of Technology (NJIT), Newark, NJ 07102

  • S. M. O'Malley

    New Jersey Institute of Technology

  • T. D. Kang

  • K. H. Kahn

    Deptartment of Physics, NJIT, Newark, NJ

  • G.L. Carr

    Brookhaven National Laboratory, NSLS, Brookhaven National Laboratory, NSLS, Brookhaven National Laboratory, Upton, NY, NSLS, Brookhaven National Lab

  • L. Mihaly

    Department of Physics and Astronomy, Stony Brook University, NY

  • S. Park

    Rutgers Center for Emergent Materials and Dept. of Physics \& Astronomy, Rutgers University

  • Sang-Wook Cheong

    Rutgers University, Department of Physics, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ