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Dielectric Response of SmB 6 in the Millimeter Wave Range
Author(s) -
Dressel M.,
Gorshunov B. P.,
Sluchanko N. E.,
Volkov A. A.,
Hendersen B.,
Grüner G.,
Knebel G.,
Loidl A.,
Kunii S.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<161::aid-pssb161>3.0.co;2-#
Subject(s) - extremely high frequency , dielectric response , millimeter , dielectric , materials science , range (aeronautics) , physics , optoelectronics , optics , composite material
The low‐temperature measurements of the conductivity and dielectric permittivity of single crystalline SmB 6 in the microwave and submillimeter spectral range give evidence for a 19 meV energy gap in the density of states and for a narrow donor‐type band lying 3 meV below the bottom of the upper conduction band. It is shown that at temperatures 8 K < T < 20 K the dc conductivity and the electrodynamic response of SmB 6 in the frequency range up to the far infrared are determined by quasi‐free carriers thermally excited in the conduction band; below 8 K the carriers are localized in the narrow band showing the typical signature of hopping conductivity.