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Fermi-surface induced variation in Tc in MgB2 alloys

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Title Fermi-surface induced variation in Tc in MgB2 alloys
 
Creator SINGH, PRABHAKAR P
 
Subject magnesium alloys
fermi surface
crystal impurities
computational methods
 
Description Using a coherent potential to describe disorder, the Gaspari–Gyorffy approach to evaluate electron–phonon coupling, and the Allen–Dynes equation to calculate Tc, we show that in Mg1−xMxB2 (M ≡ Al, Li or Zn) alloys (i) the way Tc changes depends on the location of the added/modified k-resolved states on the Fermi surface and (ii) the variation of Tc as a function of concentration is dictated by the B p density of states. In addition, using pseudopotential calculations for MgMB4, we show that (i) at x=0.5 a superstructure can form in Mg1−xAlxB2 but not in Mg1−xLixB2 or Mg1−xZnxB2, and (ii) B layer shifts towards the impurity layer, more for Al than for Li or Zn.
 
Publisher Elsevier
 
Date 2009-04-03T09:02:34Z
2011-11-25T20:29:30Z
2011-12-26T13:08:03Z
2011-12-27T05:56:04Z
2009-04-03T09:02:34Z
2011-11-25T20:29:30Z
2011-12-26T13:08:03Z
2011-12-27T05:56:04Z
2002
 
Type Article
 
Identifier Physica C: Superconductivity 382(4), 381-385
0921-4534
http://dx.doi.org/10.1016/S0921-4534(02)02054-3
http://hdl.handle.net/10054/1106
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1106
 
Language en