A. V. Galeeva, A. E. Parafin, D. V. Masterov, S. A. Pavlov, A. L. Pankratov, S. N. Danilov, L. I. Ryabova, D. R. Khokhlov, “Features of the terahertz photoconductivity in YBa$_2$Cu$_3$O$_{7-\delta}$ near the superconducting transition temperature”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2018, Volume 107, Issue 12,Pages 810

CONDENSED MATTER

Features of the terahertz photoconductivity in YBa$_2$Cu$_3$O$_{7-\delta}$ near the superconducting transition temperature

A. V. Galeeva^a, A. E. Parafin^b, D. V. Masterov^b, S. A. Pavlov^b, A. L. Pankratov^b, S. N. Danilov^c, L. I. Ryabova^d, D. R. Khokhlov^ea

^a Faculty of Physics, Moscow State University, Moscow, Russia
^b Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
^c University of Regensburg, Regensburg, Germany
^d Faculty of Chemistry, Moscow State University, Moscow, Russia
^e Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia

Abstract: Positive terahertz photoconductivity has been observed in underdoped high-temperature superconductors YBa$_2$Cu$_3$O$_{7-\delta}$ at temperatures somewhat higher than the midpoint of the superconducting transition. The amplitude of the effect is almost independent of the temperature and the power of the incident radiation if the latter exceeds a certain threshold value. The mechanisms responsible for the appearance of the effect are discussed.

Received: 24.04.2018
Revised: 15.05.2018

DOI: 10.7868/S0370274X1812010X