Far-IR magnetospectroscopy of magnons and electromagnons in TbFeO3 single crystals at low temperatures

T. N. Stanislavchuk, Yazhong Wang, S.-W. Cheong, and A. A. Sirenko
Phys. Rev. B 95, 054427 – Published 21 February 2017

Abstract

Transmittance spectra of TbFeO3 single crystals have been studied in the far-infrared spectral range 15120cm1 in the external magnetic fields up to 9 T and at low temperatures down to 1.5 K. The temperature and magnetic-field dependencies of the antiferromagnetic resonance (AFMR) modes have been measured below and above the magnetic ordering temperature of Tb moments TNTb=3.3K. Both the quasiferromagnetic and quasiantiferromagnetic modes of AFMR demonstrate hardening at T<TNTb. The quasiantiferromagnetic mode gains electric-dipole activity along the c axis below TNTb and thus behaves as a hybrid, i.e., both electric- and magnetic-dipole active, mode. In addition to AFMR modes, below TNTb we observed the appearance of electromagnon excitation at about 27cm1, which is electric-dipole active along the c axis. The electromagnon is optically active only in a narrow temperature range, 2.7K<T<TNTb at H=0, and in a narrow range of magnetic fields 2.4–2.7 T applied along the b axis at T=1.5K. We argue that this electromagnon appears in magnetic phases, which are compatible with a spontaneous electric polarization along the b axis.

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  • Received 15 November 2016

DOI:https://doi.org/10.1103/PhysRevB.95.054427

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

T. N. Stanislavchuk1,*, Yazhong Wang2, S.-W. Cheong2, and A. A. Sirenko1

  • 1Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA
  • 2Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

  • *stantar@njit.edu

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Issue

Vol. 95, Iss. 5 — 1 February 2017

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