%0 Journal Article
%T AC losses and submillimeter absorption in single crystals La2CuO4
%A Varyukhin, S. V.
%A Zakharov, A. A.
%A Gershenzon, E. M.
%A Gol'tsman, G. N.
%A Ptitsyna, N. G.
%A Chulkova, G. M.
%J Phys. B Condens. Mat.
%D 1990
%V 165-166
%@ 0921-4526
%F Varyukhin_etal1990
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1686), last updated on Thu, 27 May 2021 21:00:55 -0500
%X 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.
%K metal-dielectric-La2Cu04
%R 10.1016/S0921-4526(09)80220-2
%U https://linkinghub.elsevier.com/retrieve/pii/S0921452609802202
%U https://doi.org/10.1016/S0921-4526(09)80220-2
%P 1269-1270