Chemical trend of superconducting transition temperature in hole-doped delafossite of CuAlO2, AgAlO2 and AuAlO2

We have performed the first-principles calculations about the superconducting transition temperature Tc of hole-doped delafossite CuAlO2, AgAlO2 and AuAlO2. Calculated Tc are about 50K (CuAlO2), 40K (AgAlO2) and 3K(AuAlO2) at maximum in the optimum hole-doping concentration. The low Tc of AuAlO2 is...

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Bibliographic Details
Published in:Solid state communications 2012-12, Vol.152 (23), p.2078-2081
Main Authors: Nakanishi, Akitaka, Katayama-Yoshida, Hiroshi
Format: Article
Language:English
Subjects:
A. Semiconductors
C. Delafossite structure
Condensed matter: electronic structure, electrical, magnetic, and optical properties
D. Electron–phonon interactions
E. Density functional theory
Electronic structure
Exact sciences and technology
Metals, alloys and compounds (a15, 001c15, laves phases, chevrel phases, borocarbides, etc.)
Physics
Properties of type I and type II superconductors
Superconducting materials (excluding high-tc compounds)
Superconductivity
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Summary:We have performed the first-principles calculations about the superconducting transition temperature Tc of hole-doped delafossite CuAlO2, AgAlO2 and AuAlO2. Calculated Tc are about 50K (CuAlO2), 40K (AgAlO2) and 3K(AuAlO2) at maximum in the optimum hole-doping concentration. The low Tc of AuAlO2 is attributed to the weak electron–phonon interaction caused by the low covalency and heavy atomic mass. ► Calculations about superconducting critical temperature of hole-doped delafossite. ► Calculated Tc are about 50K (CuAlO2), 40K (AgAlO2) and 3K (AuAlO2) at maximum. ► The difference in Tc is attributed to not only atomic mass but also covalency.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2012.08.017