Magnesium diboride, recently discovered as superconductor, is extremely interesting in respect to pairing mechanisms and phonon-mediated superconductivity, but its transition temperature (39K) is decidedly too low for practical applications. A rush for substitutions started, intended to raise Tc and possibly maintain acceptable critical current density. The difficult introduction of Cu was attempted, through a complex procedure employing CuB24 instead of metallic Cu: owing to the tendency of Cu to form inter-metallic compounds with Mg, only a maximum of 3mol% of Cu was safely substituted to Mg in MgB2 lattice and a small parameters contraction proportional to Cu content was recorded. The results are a decrease in Tc of about 0.5 K, not far from that found with Al addition, whose reasons are discussed and interpreted in terms of holes doping.

Effects of copper doping in MgB2 superconductor / Tampieri, A.; Celotti, G.; Sprio, S.; Rinaldi, Daniele; Barucca, Gianni; Caciuffo, ROBERTO GIOVANNI MARIA. - In: SOLID STATE COMMUNICATIONS. - ISSN 0038-1098. - 121:9-10(2002), pp. 497-500. [10.1016/S0038-1098(01)00514-2]

Effects of copper doping in MgB2 superconductor

RINALDI, DANIELE;BARUCCA, Gianni;CACIUFFO, ROBERTO GIOVANNI MARIA
2002-01-01

Abstract

Magnesium diboride, recently discovered as superconductor, is extremely interesting in respect to pairing mechanisms and phonon-mediated superconductivity, but its transition temperature (39K) is decidedly too low for practical applications. A rush for substitutions started, intended to raise Tc and possibly maintain acceptable critical current density. The difficult introduction of Cu was attempted, through a complex procedure employing CuB24 instead of metallic Cu: owing to the tendency of Cu to form inter-metallic compounds with Mg, only a maximum of 3mol% of Cu was safely substituted to Mg in MgB2 lattice and a small parameters contraction proportional to Cu content was recorded. The results are a decrease in Tc of about 0.5 K, not far from that found with Al addition, whose reasons are discussed and interpreted in terms of holes doping.
2002
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/50228
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 45
  • ???jsp.display-item.citation.isi??? 46
social impact