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Competition of ferromagnetism and superconductivity in Sc 3 InB
Author(s) -
Wiendlocha B.,
Tobola J.,
Kaprzyk S.,
Fruchart D.,
Marcus J.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200562472
Subject(s) - superconductivity , condensed matter physics , ferromagnetism , intermetallic , ground state , electrical resistivity and conductivity , superconducting transition temperature , hexagonal crystal system , perovskite (structure) , boron , materials science , chemistry , physics , crystallography , atomic physics , metallurgy , organic chemistry , alloy , quantum mechanics
Abstract We present results of electronic structure calculations for the intermetallic perovskite Sc 3 InB with the full‐potential KKR‐LDA method. Sc 3 InB is a very promising candidate for a new superconductor (related to 8 K MgCNi 3 ) and can be regarded as a boron‐inserted cubic Sc 3 In, which is a high‐pressure allotropic form of the hexagonal weak ferromagnet Sc 3 In. We predict that cubic Sc 3 In can also be magnetic, whereas Sc 3 InB having large DOS in the vicinity of E F exhibits non‐magnetic ground state. Estimation of the electron–phonon coupling for Sc 3 InB gives λ ≃ 1. Furthermore, the effect of vacancies in Sc 3 InB 1– x and antisite disorder in Sc 3 (In‐B) on critical parameters is also discussed using the KKR–CPA method. All theoretical results support the possibility of the superconductivity onset in Sc 3 InB. Preliminary experimental measurements established the transition temperature close to 4.5 K, with a very abrupt change in susceptibility and a correlated drop of the resistivity when cooling. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)