Publications (14)0 Total impact
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Article: The investigation of EPR paramagnetic probe line width and shape temperature dependence in high-temperature superconductors of Bi-Pb-Sr-Ca-Cu-O system
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ABSTRACT: The work is related with the finding out of magnetic phases in strongly anisotropic high-temperature superconductor Bi1,7Pb0,3Sr2Ca2Cu3O10-d in the temperature region where the superconductor is in the normal state. It was studied the temperature dependence of the paramagnetic probe EPR line width. In the normal state at T>Tc near 175 K it was revealed a pick in the temperature dependence of line width. In this region it was observed the time increase of the line width with the characteristic time ~ 17 min. This shows the possibility of magnetic phase formation in this material. Comment: 4 pages, 0 figures08/2008; -
Article: Investigation of stimulated dynamics in strongly anisotropic high-temperature superconductors system Bi-Pb-Sr-Ca-Cu-O
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ABSTRACT: It is used the mechanical method of Abrikosov vortex stimulated dynamics investigation in superconductors. With its help it was studied relaxation phenomena in vortex matter of high-temperature superconductors. It established that pulsed magnetic fields change the course of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses differing by their durations and amplitudes on vortex system of strongly anisotropic high-temperature superconductors system Bi1.7Pb0.3Sr2Ca2Cu3O10-d showed the presence of threshold phenomena. The small duration pulses do not change the course of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence change the course of relaxation process which is revealed by stepwise change of relaxing mechanical moment.. These investigation showed that the time for formatting of Abrikosov vortex lattice in Bi1.7Pb0.3Sr2Ca2Cu3O10-d is of the order of 150 us which on the order of value exceeds the time necessary for formation of a single vortex observed in isotropic high-temperature superconductor HoBa2Cu3O7-d and on two orders exceeds the creation time of a single vortex observed in classical type II superconductors. Comment: 6 pages, 0 figures07/2008; -
Article: Investigation of relaxation phenomena in high-temperature superconductors HoBa2Cu3O7-d at the action of pulsed magnetic fields
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ABSTRACT: It is used the mechanical method of Abrikosov vortex stimulated dynamics investigation in superconductors. With its help it was studied relaxation phenomena in vortex matter of high-temperature superconductors. It established that pulsed magnetic fields change the course of relaxation processes taking place in vortex matter. The study of the influence of magnetic pulses differing by their durations and amplitudes on vortex system of isotropic high-temperature superconductors system HoBa2Cu3O7-d showed the presence of threshold phenomena. The small duration pulses does not change the course of relaxation processes taking place in vortex matter. When the duration of pulses exceeds some critical value (threshold), then their influence change the course of relaxation process which is revealed by stepwise change of relaxing mechanical moment . These investigations showed that the time for formatting of Abrikosov vortex lattice in HoBa2Cu3O7-d is of the order of 20 microsec. which on the order of value exceeds the time necessary for formation of a single vortex observed in type II superconductors. Comment: 6 pages, 0 figures04/2007; -
Article: Investigation of the anisotropy of dissipation processes in single crystal of Yba2Cu3O7-d system
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ABSTRACT: By means of contactless mechanical method of the measurement of energy losses in superconductors, the anisotropy of dissipation processes has been studied in single crystal high-temperature layered superconductors of Yba2Cu3O7-d system, being in mixed state. The observed anisotropy of energy losses indicates the possibility of the existence of the symmetry of order parameter of dx2-y2 type in these single crystals.09/2005; -
Article: Induced transparency in EXAFS as cuprate superconductors go through Tc
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ABSTRACT: The increased transmission, observed in the EXAFS region of their X-ray absorption spectra, as cuprate materials go through the superconducting transition temperature Tc is correlated with an increase in Abrikosov Vortex expulsion in zero magnetic field as the temperature T approaches Tc.09/2005; -
Article: Investigation of stimulated dynamics of vortex-matter in high-temperature superconductors
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ABSTRACT: A simple mechanical method for the investigation of Abrikosov vortex lattice stimulated dynamics in superconductors has been used. By this method we studied the action of pulsed magnetic fields on the vortex lattice and established the resulting change of the course of relaxation processes in the vortex matter in high-temperature superconductors. This method can be used for investigation of phase transitions in vortex matter both high-temperature and exotic superconductors. Comment: 5 pages, 6 figures08/2005; -
Article: Effect of Secondary Echo Signals in Spin-Systems with a Large Inhomogeneous Broadening of NMR Line
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ABSTRACT: The possibility of comparatively simple and fast determination of characteristic relaxation parameters T1, T2 and T3 for nuclear spin-systems with strong Larmor and Rabi inhomogeneous broadenings of NMR lines using the secondary echo signal effect was experimentally shown. Resides, this method gives opportunity to obtain a valuable infomation on the inhomogeneous NMR broadening which reflects the character of magnetic field microscopic destribution in such systems, as example, multidomain magnetics and superconductors. Comment: 12 pages, 5 figures10/2003; -
Article: Study of dissipation processes in high-temperature superconductors of ErBa2Cu3O7-δ system near the superconductive transition critical temperature Tc in the range of possible Abrikosov vortex lattice melting
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ABSTRACT: Abrikosov vortex melting in high-temperature superconductors of ErBa2Cu3O7-δ system is investigated using mechanical contactless method of energy dissipation.07/2003; -
Article: Study of pinning at 3D-2D phase transition in vortex matter of strongly anisotropic high-temperature superconductors of BiPbSrCaCuO system
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ABSTRACT: Sharp increase of pinning force was observed at the 3D-2D phase transition in strongly anisotropic high temperature superconductors of the BiPbSrCaCuO system. Comment: 5 pages01/2003; -
Article: Formation Mechanisms of Single-Pulse and Secondary Echoes in Systems with a Large Inhomogeneous Broadening of NMR Lines
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ABSTRACT: In the frames of Mims transformation matrix method the equation for nuclear magnetization are obtained describing the dynamics of nuclear spin-systems with a strong Larmor and Rabi inhomogeneous broadenings of NMR line in conditions of their unequlibrium earlier obtained by the statistical tensors method. As example, properties of proton single-pulse echo and its secondary signals in probe material (silicon oil) coated on the surface of high-Tc superconducting-oxides powder and in metallic hydride are presented.08/2002; -
Article: On amplitude oscillation of vibrations of strongly anisotropic high-temperature superconductors of BiPbSrCaCuO system
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ABSTRACT: Effect of oscillations of the vibration amplitude of cylindrical sample suspended by a thin elastic thread and vibrating in a transverse magnetic field and containing 2D quasi-two-dimensional vortices (pancakes), was observed in the strongly anisotropic high-$T_{c}$ superconductor of $Bi_{1.7}Pb_{0.3}Sr_{2}Ca_{2}Cu_{3}O_{y}$ system. Comment: 8 pages, 7 figures05/2002; -
Article: 3D-2D phase transition in vortex lattice of layered high-temperature superconductors of BSCCO (Bi$_{1.7}$Pb$_{0.3}$Sr$_2$Ca$_2$Cu$_3$O$_4$)
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ABSTRACT: Using the high-sensitive mechanical method of measuring the dissipation processes in superconductors, the 3D-2D phase transition in magnetic field was investigated in the vortex lattice of strongly anisotropic high-temperature superconductors of Bi(2223) system. It was shown that with the increase of external magnetic field the dissipation connected with a motion of vortexes relative to the crystal lattice of a sample, first increases, reaching the maximum and then with a further increase of the magnetic field sharply reduces as a result of pinning enhancement in connection with the transition of three-dimensional vortex system in quasi-two-dimensional "pancake" one.11/2001; -
Article: The investigation of EPR paramagnetic probe line width and shape temperature dependence in high-temperature superconductors of Bi–Pb–Sr–Ca–Cu–O system
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ABSTRACT: The work describes the appearance of magnetic phases in the strongly anisotropic high-temperature superconductor Bi1.7Pb0.3Sr2Ca2Cu3O10 − δ, in the temperature region where the superconductor is in the normal state, as determined by the EPR line width, ΔH of a paramagnetic probe in its proximity. In the normal state, near 175 K>Tc a peak in the temperature dependence of ΔH develops with the characteristic time ∼17 min, which indicates the onset of a magnetic phase-domains in this material.Physics Letters A. -
Article: Study of pinning at 3D–2D phase transition in vortex matter of strongly anisotropic high-temperature superconductors of BiPbSrCaCuO system
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ABSTRACT: Sharp increase of pinning force was observed at the 3D–2D phase transition in strongly anisotropic high-temperature superconductors of the BiPbSrCaCuO system.Physics Letters A.
