| Records |
| Author |
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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Edition |
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| ISSN |
0921-4534 |
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| Notes |
ISI:A1993MM29800033 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
253 |
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| Author |
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. |
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Institut de G |
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09214534 (ISSN) |
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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 |
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 |
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| 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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01631829 (ISSN) |
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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 |
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BT @ luzuriag @ |
Serial |
522 |
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