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Title: Far-IR magnetospectroscopy of magnons and electromagnons in TbFe O 3 single crystals at low temperatures

Abstract

Transmittance spectra of TbFe O 3 single crystals have been studied in the far-infrared spectral range 15 - 120 c m - 1 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 T Tb N = 3.3 K . Both the quasiferromagnetic and quasiantiferromagnetic modes of AFMR demonstrate hardening at T < T Tb N . The quasiantiferromagnetic mode gains electric-dipole activity along the c axis below T Tb N and thus behaves as a hybrid, i.e., both electric- and magnetic-dipole active, mode. In addition to AFMR modes, below T Tb N we observed the appearance of electromagnon excitation at about 27 c m - 1 , which is electric-dipole active along the c axis. The electromagnon is optically active only in a narrow temperature range, 2.7 K < T < T Tb N at H = 0 , and in a narrow range of magnetic fields 2.4–2.7 T applied along the b axis at T = 1.5 K . We argue that this electromagnon appears in magneticmore » phases, which are compatible with a spontaneous electric polarization along the b axis.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1409548
Report Number(s):
BNL-114600-2017-JA¿¿¿
Journal ID: ISSN 2469-9950; PRBMDO
DOE Contract Number:  
SC0012704
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Stanislavchuk, T. N., Wang, Yazhong, Cheong, S. -W., and Sirenko, A. A. Far-IR magnetospectroscopy of magnons and electromagnons in TbFeO3 single crystals at low temperatures. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.054427.
Stanislavchuk, T. N., Wang, Yazhong, Cheong, S. -W., & Sirenko, A. A. Far-IR magnetospectroscopy of magnons and electromagnons in TbFeO3 single crystals at low temperatures. United States. doi:10.1103/PhysRevB.95.054427.
Stanislavchuk, T. N., Wang, Yazhong, Cheong, S. -W., and Sirenko, A. A. Wed . "Far-IR magnetospectroscopy of magnons and electromagnons in TbFeO3 single crystals at low temperatures". United States. doi:10.1103/PhysRevB.95.054427.
@article{osti_1409548,
title = {Far-IR magnetospectroscopy of magnons and electromagnons in TbFeO3 single crystals at low temperatures},
author = {Stanislavchuk, T. N. and Wang, Yazhong and Cheong, S. -W. and Sirenko, A. A.},
abstractNote = {Transmittance spectra of TbFe O 3 single crystals have been studied in the far-infrared spectral range 15 - 120 c m - 1 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 T Tb N = 3.3 K . Both the quasiferromagnetic and quasiantiferromagnetic modes of AFMR demonstrate hardening at T < T Tb N . The quasiantiferromagnetic mode gains electric-dipole activity along the c axis below T Tb N and thus behaves as a hybrid, i.e., both electric- and magnetic-dipole active, mode. In addition to AFMR modes, below T Tb N we observed the appearance of electromagnon excitation at about 27 c m - 1 , which is electric-dipole active along the c axis. The electromagnon is optically active only in a narrow temperature range, 2.7 K < T < T Tb N at H = 0 , and in a narrow range of magnetic fields 2.4–2.7 T applied along the b axis at T = 1.5 K . We argue that this electromagnon appears in magnetic phases, which are compatible with a spontaneous electric polarization along the b axis.},
doi = {10.1103/PhysRevB.95.054427},
journal = {Physical Review B},
issn = {2469-9950},
number = 5,
volume = 95,
place = {United States},
year = {2017},
month = {2}
}

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