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

Journal Article · · Physical Review B

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.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
SC0012704
OSTI ID:
1409548
Report Number(s):
BNL-114600-2017-JA¿¿¿; PRBMDO
Journal Information:
Physical Review B, Vol. 95, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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