Point-contact spectroscopy of superconducting YBaCuO single crystals of tetragonal modification
I. K. YansonPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovL. F. Rybal’chenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovV. V. FisunPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovN. L. BobrovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovV. V. DemirskiĭPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovV. V. MitkevichPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Kharkov
ABI
Аннотация
The point-contact spectra of tetragonal YBa2Cu3O7–δ with Tc = 50−60 K are studied at various temperatures. The single-electron energy (2Δ0/kTc≃l7) and its temperature dependence are determined. The characteristic energies of quasiparticle excitations interacting with conduction electrons in this high-Tc superconductor are found to correlate with the characteristic phonon energies. The possibility of a pair gap, which increases with temperature, is revealed near the critical temperature.
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