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Superconducting and Fermi Surface Properties of a Valence Fluctuation Compound CeIr2
CeIr2 was reported as a valence fluctuation compound with a superconducting transition temperature of ∼0.3 K. To investigate its electronic and superconducting properties, we measured the electrical resistivity, magnetic susceptibility, and de Haas–van Alphen (dHvA) effect at low temperatures cooled...
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Published in: | Journal of the Physical Society of Japan 2024-03, Vol.93 (3), p.1 |
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Main Authors: | , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | CeIr2 was reported as a valence fluctuation compound with a superconducting transition temperature of ∼0.3 K. To investigate its electronic and superconducting properties, we measured the electrical resistivity, magnetic susceptibility, and de Haas–van Alphen (dHvA) effect at low temperatures cooled to ∼30 mK and in high magnetic fields up to 36 T. The upper critical field (μ0Hc2 = 0.23 T) determined by the electrical resistivity under the magnetic field and the electron–phonon coupling constant (λep = 0.39) estimated from the Debye temperature suggested a weak-coupling BCS-type superconductivity. The dHvA effect measurements mapped the Fermi surface in detail. The dHvA branches with the frequencies of F = 122–2180 T and the effective masses of mc∗=0.83–2.4 m0 (m0: rest mass of an electron) were observed. These were reasonably explained by the band-structure calculation based on the full potential linearized augmented-plane-wave method within the local density approximation. |
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ISSN: | 0031-9015 1347-4073 |
DOI: | 10.7566/JPSJ.93.034704 |