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This article is cited in 5 scientific papers (total in 5 papers)
CONDENSED MATTER
Comparative study of electronic structure of new
superconductors (Sr,Ca)Pd$_2$As$_2$ and related compound BaPd$_2$As$_2$
I. A. Nekrasova, M. V. Sadovskiiba a Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, Ekaterinburg
b Institute of Metal Physics, Ural Division of the Russian Academy of Sciences
Abstract:
This paper presents the comparative study of LDA calculated electronic structure
of new isostructural to iron based systems superconductors (Sr,Ca)Pd$_2$As$_2$
with T$_c$ about $1$ K and similar but structurally different system BaPd$_2$As$_2$.
Despite chemical formula looks similar to iron superconductors and
even main structural motif is the same – layers of Fe square lattices,
electronic structure of (Sr,Ca)Pd$_2$As$_2$ and BaPd$_2$As$_2$
differs from Fe(As,Se)-HTSC completely.
All these systems have essentially three dimensional Fermi surfaces in contrast to
Fe(As,Se) materials.
The Fermi level is crossed by low intensive tails of Pd-$4d$ and As-$4p$ states.
However (Sr,Ca)Pd$_2$As$_2$ and BaPd$_2$As$_2$ materials have
rather well developed peaks of Pd-$4d$($x^2-y^2$) band. Thus by doping
of about 2 holes per unit cell one can increase density of states
at the Fermi level by a factor about 2.5. Since experimentally
these compounds were found to be simple BCS superconductors
the hole doping may considerably increase T$_c$.
LDA calculated total densities of states at the Fermi level
for stoichiometric systems perfectly agree with experimental
estimates signifying rather small role of electronic correlations.
Received: 28.03.2013
Citation:
I. A. Nekrasov, M. V. Sadovskii, “Comparative study of electronic structure of new
superconductors (Sr,Ca)Pd$_2$As$_2$ and related compound BaPd$_2$As$_2$”, Pis'ma v Zh. Èksper. Teoret. Fiz., 98:1 (2013), 28–32; JETP Letters, 98:1 (2013), 24–27
Linking options:
https://www.mathnet.ru/eng/jetpl3459 https://www.mathnet.ru/eng/jetpl/v98/i1/p28
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Abstract page: | 240 | Full-text PDF : | 41 | References: | 40 | First page: | 4 |
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