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КОНДЕНСИРОВАННОЕ СОСТОЯНИЕ
Electronic structure of new multiple band Pt-pnictide superconductors
APt$_3$P
I. A. Nekrasova,
M. V. Sadovskiiab a Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, Ekaterinburg
b Institute of Metal Physics, Ural Division of the Russian Academy of Sciences
Аннотация:
We report LDA calculated band structure, densities of states and
Fermi surfaces for recently discovered Pt-pnictide superconductors
APt
$_3$P (A
${}={}$Ca, Sr, La), confirming their multiple band nature.
Electronic structure is essentially three dimensional, in contrast to
Fe pnictides and chalcogenides. LDA calculated Sommerfeld coefficient
agrees rather well with experimental data, leaving little space for very strong
coupling superconductivity, suggested by experimental data on specific heat
of SrPt
$_3$P. Elementary estimates show, that the values of critical temperature
can be explained by rather weak or moderately strong coupling, while the
decrease of superconducting transition temperature
$T_c$ from Sr to La compound
can be explained by corresponding decrease of total density of states at the
Fermi level
$N(E_{\rm F})$. The shape of the density of states near the Fermi level
suggests that in SrPt
$_3$P electron doping (such as replacement Sr by La)
decreases
$N(E_{\rm F})$ and
$T_c$, while hole doping (e.g. partial
replacement of Sr with K, Rb or Cs, if possible) would increase
$N(E_{\rm F})$ and
possibly
$T_c$.
Поступила в редакцию: 24.05.2012
Язык публикации: английский