TY  - JOUR
AU  - Varyukhin, S. V.
AU  - Zakharov, A. A.
AU  - Gershenzon, E. M.
AU  - Gol'tsman, G. N.
AU  - Ptitsyna, N. G.
AU  - Chulkova, G. M.
PY  - 1990
DA  - 1990//
TI  - AC losses and submillimeter absorption in single crystals La2CuO4
T2  - Phys. B Condens. Mat.
JO  - Phys. B Condens. Mat.
SP  - 1269
EP  - 1270
VL  - 165-166
KW  - metal-dielectric-La2Cu04
AB  - The La2CuO4 single crystals were used to carry out the measurements of transmission spectra within the submillimeter range of wavelengths, as well as the capacitance C and conductivity G in the region of acoustic frequencies of the metal-dielectric-La2Cu04 system at low temperatures. The optical spectra display a threshold character. There takes place a sharp decreasing of transmission signal in the energy range of hυ>1.5meV. The C(ω,T) and G(ω,T) dependences have a universal form characteristic of relaxation processes of the Debye type. The relaxation time dependence displays a thermoactivation character τ(T)-exp(ξ/T) with a gap value of ξ≃2meV,coinciding with the optical one. It is assumed that there exist excitations with a characteristic energy ~ 2meV in La2Cu04.A possible nature of the revealed low-energy excitations is discussed.
SN  - 0921-4526
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0921452609802202
UR  - https://doi.org/10.1016/S0921-4526(09)80220-2
DO  - 10.1016/S0921-4526(09)80220-2
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1686), last updated on Thu, 27 May 2021 21:00:55 -0500
ID  - Varyukhin_etal1990
ER  -