PT Journal
AU Varyukhin, SV
   Zakharov, AA
   Gershenzon, EM
   Gol'tsman, GN
   Ptitsina, NG
   Chulkova, GM
TI Low energy excitation in La[sub:2]CuO[sub:4]
SO Sverkhprovodimost': Fizika, Khimiya, Tekhnika
JI Sverkhprovodimost': Fizika, Khimiya, Tekhnika
PY 1990
BP 832
EP 837
VL 3
IS 5
DE metal-dielectric-La2CuO4; monocrystals
AB Measurements of transmission and photoconductivity spectra in submillimeter wave length range as well as of capacity C and conductivity G in the region of acoustic frequencies of metal-dielectric-La2CuO4 system at low temperatures are performed using La2CuO4 monocrystals. Optical spectra posses a threshold character, a sharp decrease of transmission and photocoductivity signal occurs in the energy region hν>1.5 MeV. C(ω,T) and G(ω, T) dependences have a universal form typical of Debye type relaxation processes. Relaxation time dependence is of thermoactivated character τ(T)∼exp(ξ/T) with the gap value ξ≅2 meV. It is assumed that excitations with characteristic energy of ∼2 meV exist in La2CuO4. A possible nature of the detected low-energy excitations is discussed.
ER