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Author (up) D'Anna, G.; Andre, M.-O.; Benoit, W.; Rodriguez, E.; Rodriguez, D.S.; Luzuriaga, J.; Wasczak, J.V.
Title Flux-line response in 2H-NbSe2 investigated by means of the vibrating superconductor method Type Journal Article
Year 1993 Publication Physica C Abbreviated Journal Physica C
Volume 218 Issue 1-2 Pages 238-244
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Abstract We measure transverse AC losses in the low- and high-amplitude regime of 2H-NbSe2 single crystals using vibrating superconductor methods. The measurements are sensitive to small deviations of the critical state. The data constitute evidence for a peak effect of the critical current as a function of the temperature in this compound. We construct in the H-T phase diagram the ''peak-effect'' line which is supposed to mark an abrupt cross-over in the vortex-pinning regime.
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ISSN 0921-4534 ISBN Medium
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Notes ISI:A1993MM29800033 Approved no
Call Number BT @ hernan @ Serial 253
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Author (up) Luzuriaga, J.; Andre, M.-O.; Benoit, W.
Title Frequency and amplitude response of the flux-line lattice to mechanical perturbation in ceramic YBa2Cu3O7 Type Journal Article
Year 1992 Publication Physica C: Superconductivity and its applications Abbreviated Journal Phys C Supercond Appl
Volume 201 Issue 3-4 Pages 257-262
Keywords Copper oxides; Crystal lattices; Frequency response; Internal friction; Lattice vibrations; Magnetic fields; Mathematical models; Mechanical properties; Pendulums; Rheology; Thermal effects; Torque; Yttrium compounds; Amplitude response; Ceramic yttrium barium copper oxides; Extended dry friction model; Flux line lattices; Forced pendulum; Frequency independent dissipation peak; Mechanical response; Thermal activation; High temperature superconductors
Abstract The mechanical response of the flux-line lattice has been measured with a low-frequency forced pendulum in ceramic YBa2Cu3O7. A dissipation peak observed in temperature sweeps is frequency-independent between 1 mHz and 5 Hz. Dissipation depends strongly on applied torque, and for fixed temperatures this dependence is well fitted by a rheological model of extended dry friction. If the model is extended to take account of thermal activation, however, it does not agree with the measured frequency independence, which is hard to explain within simple models of thermal activation.
Address Institut de G
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ISSN 09214534 (ISSN) ISBN Medium
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Notes Export Date: 28 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Institut de G Approved no
Call Number BT @ luzuriag @ Serial 487
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Author (up) Luzuriaga, J.; Andre, M.-O.; Benoit, W.
Title Mechanical response of the flux lines in ceramic YBa2Cu3O7- Type Journal Article
Year 1992 Publication Physical Review B Abbreviated Journal
Volume 45 Issue 21 Pages 12492-12497
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Abstract We have studied the mechanical response of the flux-line lattice (FLL) in ceramic samples of YBa2Cu3O7 by means of a low-frequency forced pendulum. The internal friction and elastic modulus variation of the FLL have been measured as a function of temperature for different values of the applied stress. A somewhat different behavior was observed whether a zero-field-cooling or field-cooling procedure was followed. Measurements of the internal friction and elastic modulus as a function of the applied stress at constant temperature show amplitude-dependent dissipation, with a maximum dissipation at intermediate values of the stress. This dependence is well fitted by a rheological model of extended dry friction, if we restrict ourselves to the dissipation and modulus at fixed temperature. The agreement is not so good when attempting to extend the model to fit the temperature dependence.
Address Institut de Genie Atomique, Ecole Politechnique Federal de Lausanne, (1015) Ecublens, Switzerland
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ISSN 01631829 (ISSN) ISBN Medium
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Notes Export Date: 28 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.45.12492; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Institut de Genie Atomique; Ecole Politechnique Federal de Lausanne (1015) Ecublens, Switzerland Approved no
Call Number BT @ luzuriag @ Serial 522
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