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Durán, C.; Esquinazi, P.; Luzuriaga, J.; Brandt, E.H. |
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Title |
Bc1 of high-Tc La1.8Sr0.2CuO4 and amorphous Zr70Cu30 superconductors measured by a vibrating reed |
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1987 |
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Physics Letters A |
Abbreviated Journal |
Phys. Lett. A |
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123 |
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9 |
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485-488 |
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Keywords |
Zr70Cu30; ZIRCONIUM COPPER ALLOYS – Amorphous |
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Abstract |
The lower critical field Bc1 of the high-Tc superconductor La1.8Sr0.2CuO4 (Tc=40 K, Bcless-than-or-equals, slant7.7 mT) and of amorphous Zr70Cu30 (Tc=2.6K, Bc1less-than-or-equals, slant3.8 mT) is obtained from the resonance frequency ?/2? of a vibrating reed made of these materials. At applied magnetic fields Ba<Bc1, ?(Ba)=?i(Ba) as predicted for an ideally diamagnetic reed. Above Bc1 we observe a reversible linear law ?2??2inot, vert, similarB2a?B2c1. This allows a simple definition of Bc1 even in ceramic superconductors into which flux starts to penetrate at Bamuch less-thanBc1 due to their granular structure. |
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0375-9601 |
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ISI:A1987K407100012 |
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BT @ hernan @ |
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269 |
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Osquiguil, E.; Frank, V.L.P.; de la Cruz, F. |
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Title |
Two dimensional collective flux pinning in melt spun superconducting amorphous Zr70Cu30 |
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Journal Article |
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Year |
1985 |
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Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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55 |
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3 |
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227-230 |
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ZIRCONIUM COPPER ALLOYS – Amorphous; CRITICAL CURRENTS; PINNING FORCES; SUPERCONDUCTING MATERIALS |
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We have measured the critical currents in melt spun amorphous Zr70Cu30 and their evolution with heat treatment. We found that the pinning forces may be interpreted in terms of the Larkin-Ovchinnikov two dimensional collective pinning theory. |
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Centro Atómico Bariloche – Instituto Balseiro, Argentina |
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00381098 (ISSN) |
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Cited By (since 1996): 1; Export Date: 17 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Osquiguil, E.J.; Centro At |
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420 |
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Arce, R.; Civale, L.; Luzuriaga, J.; Guimpel, J.; de la Cruz, F. |
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Title |
Surface normal regions in superconducting Zr70Cu30 induced by thermal relaxation |
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Journal Article |
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1983 |
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Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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48 |
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12 |
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1027-1030 |
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ZIRCONIUM COPPER ALLOYS – Physical Properties; SUPERCONDUCTING MATERIALS |
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Penetration depth measurements show that thermal heat treatment in amorphous Zr70Cu30 induces a normal region 5000 Å thick at the surface of ultrarapid quenched ribbons. Upper critical field measurements indicate that the new induced phase is a normal one while the rest of the sample remains as a homogeneous superconducting phase. |
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Centro Atómico Bariloche – Instituto Balseiro |
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00381098 (ISSN) |
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Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Arce, R.; Centro At |
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502 |
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Civale, L.; de la Cruz, F.; Luzuriaga, J. |
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Title |
Critical temperature and density of states in amorphous Zr70Cu30 |
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Journal Article |
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Year |
1983 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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48 |
Issue |
4 |
Pages |
389-391 |
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Keywords |
ZIRCONIUM COPPER ALLOYS |
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By means of thermal heat treatment of amorphous Zr70Cu30 it is shown that the induced decrease in critical temperature is followed by a reduction in the electronic density of states of the same magnitude as that obtained by changing the Cu concentration. This result indicates that the density of states is the fundamental microscopic parameter determining the superconducting behavior. |
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Centro Atomico Bariloche |
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00381098 (ISSN) |
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Cited By (since 1996): 1; Export Date: 28 April 2009; Source: Scopus; CODEN: SSCOA; Language of Original Document: English; Correspondence Address: Civale, L.; Centro At |
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503 |
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Guimpel, J.; de la Cruz, F. |
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Electrical resistivity of amorphous Zr70Cu30 and the Kondo like model |
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Journal Article |
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Year |
1982 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
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44 |
Issue |
7 |
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1045-1046 |
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Keywords |
Zr70Cu30; superconductivity; electrical resistivity; ZIRCONIUM COPPER ALLOYS |
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Electrical resistivity measurements of amorphous Zr70Cu30 as a function of the concentrations of two level systems show that a Kondo like theory cannot explain the observed temperature dependence. |
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0038-1098 |
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BT @ pedrazp @ |
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540 |
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