Functional materials, V.7, No.2

Internal friction of high-temperature superconductor YBa₂Cu₃O_7-delta in normal and superconducting state

V.M.Arzhavitin, V.A.Finkel

National Scientific Center "Kharkov Institute of Physics and Technology", National Academy of Sciences of Ukraine, 1 Akademicheskaya St., 61108 Kharkiv, Ukraine

Received July 14, 1999

Internal friction of high-temperature superconductor (HTSC) YBa₂Cu₃O_7-delta has been measured within 77<=T<=200 K temperature range in zero magnetic field and at 77 K in fields having strengths up to 500 Oe. The superconductivity destriction processes at T_c have been studied as well as the kinetics of the magnetic field penetration into HTSC at H>H_c1. A diagnostic possibility of various magnetic states of the HTSC using the internal friction method has been shown. A correlation has been found to exist between relaxation and magnetic properties of HTSC in relatively weak magnetic fields H_c1<H<<H_c2.

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