BULLETIN OF THE LEBEDEV PHYISICS INSTITUTE
P.N.Lebedev Physics Institute of the Russian Academy of sciences

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1. Title:
BEREZINSKI−KOSTERLITZ−THOULESS TRANSITION IN YBa2Cu3O7−x SINGLE CRYSTALS
Authors:
M.A. Vasyutin, A.I. Golovashkin, G.I. Kuznetsov, N.D. Kuzmichev.



Abstract:
Berezinski−Kosterlitz−Thouless (BKT) phase transition is revealed experimentally in YBa2Cu3O7−x single crystals by direct measurements of volt-ampere characteristics of direct current. We report on measurements of the amplitudes of higher voltage harmonics in the sample response signal in the presence of variable component in the operating current, as a function of temperature and current. The position of the maximum of temperature dependences of the amplitudes of higher voltage harmonics, T*, is shown to coincide with the BKT transition temperature TBKT. Thus we propose a new method of determining this temperature. In the investigated YBa2Cu3O7−x single crystals the quantity T* = TBKT ?l 92 K. Above the temperature T* the voltage higher-harmonic amplitudes fall sharply because of the Nelson−Kosterlitz jump. The effective density of supercurrent carriers, the coherence length, and the magnetic field penetration depth in CuO2 planes are determined on the basis of the results obtained at T = 92 K.


2. Title:
MAGNETIC-FIELD AND TEMPERATURE PROPERTIES OF MAGNETIZATION BY WEAK MAGNETIC FIELDS OF GRANURAL HIGH-TEMPERATURE SUPERCONDUCTORS YBa2Cu3O7−x
Authors:
A.I. Golovashkin, G.I. Kuznetsov, N.D. Kuzmichev, V.V. Slavkin.



Abstract:


3. Title:
STOLETOV CONSTANT AND THE MAXIMUM OF TOWNSEND COEFFICIENT AS A FUNCTION OF THE FIELD STRENGTH
Authors:
S.I. Yakovlenko.



Abstract:


4. Title:
CHERENKOV LOSS IN THE JOSEPHSON JUNCTION
Authors:
A.S. Malishevskii, V.P. Silin, S.A. Uryupin, S.G. Uspenskii.



Abstract:


5. Title:
STUDY OF STRUCTURAL CHANGES IN AN ION-IRRADIATED YBa2Cu3O7−x FILM USING SCANNING TUNNELING MICROSCOPY
Authors:
S.V. Antonenko, M.A. Goryachev, S.M. Tolkachyova, N.P. Shabanov.



Abstract:


6. Title:
TIME VARIATIONS OF THE TOTAL NUMBER OF OSCILLATORS AND CORRELATION BETWEEN THE LINE WIDTH AND POSITION OF THE LINE MAXIMUM FOR INTERMOLECULAR VIBRATIONS IN AQUEOUS SOLUTIONS OF HYDROGEN PEROXIDE
Authors:
A.V. Kraiskii, N.N. Melnik.



Abstract: