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Title: | Mixed-state transport characteristics of magnesium diboride films |
Issue Date: | 1-Jun-2013 |
Publisher: | Sociedade Brasileira de Física |
Description: | We have investigated the low-temperature (T < Tc=10) mixed-state current-voltage (IV) response of magnesium diboride films beyond the point where the superconductivity is completely destroyed and the system enters the normal state. The resistance-versus-current R(I) curves are extremely steep and featureless, with a critical current density j c, marking the onset of dissipation, that is unusually high (j c>j d/10) with respect to the depairing current density j d. At large flux densities Hc2/10 <img id="_x0000_i1026" src="../../../../img/revistas/bjp/v33n4/a13img01.gif" align=absbottom>B <img id="_x0000_i1027" src="../../../../img/revistas/bjp/v33n4/a13img01.gif" align=absbottom>Hc2, the R(I) curve has a functional shape that is largely independent of B, indicating that the rise in resistivity with increasing current occurs mainly due to pair-breaking rather than flux motion. The macroscopic destruction current I*, which drives the system normal, has a <img id="_x0000_i1028" src="../../../../img/revistas/bjp/v33n4/a13img02.gif" align=absbottom>flux-density dependence, suggesting that the vortices mainly reduce the effective cross section over which a current of effective density j ~ j d flows. |
URI: | http://koha.mediu.edu.my:8181/jspui/handle/123456789/8303 |
Other Identifiers: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332003000400013 http://www.doaj.org/doaj?func=openurl&genre=article&issn=01039733&date=2003&volume=33&issue=4&spage=705 |
Appears in Collections: | Physics and Astronomy |
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