Evidence of conventional superconductivity in single-crystalline MgCNi3

Despite the strong expectation for a ferromagnetic ground state in MgCNi3, the real ground state shows superconductivity without any evidence of magnetism. In the electrical transport measurements on single-crystalline MgCNi3, we found that the ferromagnetic spin fluctuation either did not exist or...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2008-06, Vol.20 (25), p.255222-255222 (4)
Main Authors: Lee, Hyun-Sook, Jang, Dong-Jin, Lee, Hye-Gyong, Kang, W, Cho, M H, Lee, Sung-Ik
Format: Article
Language:English
Subjects:
Bcs theory and its development
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Metals, alloys and compounds (a15, 001c15, laves phases, chevrel phases, borocarbides, etc.)
Physics
Superconducting materials (excluding high-tc compounds)
Superconductivity
Theory and models of superconducting state
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Summary:Despite the strong expectation for a ferromagnetic ground state in MgCNi3, the real ground state shows superconductivity without any evidence of magnetism. In the electrical transport measurements on single-crystalline MgCNi3, we found that the ferromagnetic spin fluctuation either did not exist or was very suppressed and that MgCNi3 could be well described by using the Bardeen-Cooper-Schrieffer theory. The evidence for this conclusion is as follows: (1) the normal-state resistivity could be explained by using the electron-phonon scattering model and (2) Hc2(T) near Tc was linear.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/20/25/255222