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Acoustic-mode-driven electron-phonon coupling in transition-metal diborides

DSpace at IIT Bombay

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Title Acoustic-mode-driven electron-phonon coupling in transition-metal diborides
 
Creator SINGH, PP
 
Subject linear-response theory
mgb2
superconductivity
pseudopotentials
spectroscopy
 
Description We show that the electron-phonon coupling lambda(qnu) in the transition-metal diborides NbB2 and TaB2 is dominated by the longitudinal acoustical (LA) mode, in contrast to the optical E-2g-mode-dominated coupling in MgB2. Our ab initio results, described in terms of phonon dispersion, linewidth, and lambda(qnu) along Gamma-A, also show that (i) NbB2 and TaB2 have a relatively weak electron-phonon coupling, (ii) the E-2g linewidth is an order of magnitude larger in MgB2 than in NbB2 or TaB2, (iii) the E-2g frequency in NbB2 and TaB2 is considerably higher than in MgB2, and (iv) the LA frequency at A for TaB2 is almost half of that of MgB2 or NbB2.
 
Publisher AMERICAN PHYSICAL SOC
 
Date 2011-07-17T10:34:36Z
2011-12-26T12:50:15Z
2011-12-27T05:36:25Z
2011-07-17T10:34:36Z
2011-12-26T12:50:15Z
2011-12-27T05:36:25Z
2003
 
Type Article
 
Identifier PHYSICAL REVIEW B, 67(13), -
1098-0121
http://dx.doi.org/10.1103/PhysRevB.67.132511
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4703
http://hdl.handle.net/10054/4703
 
Language en