Spin-Triplet Superconductivity Induced by Longitudinal Ferromagnetic Fluctuations in UCoGe: Theoretical Aspect

Identification of pairing mechanisms leading to the unconventional superconductivity realized in copper-oxide, heavy-fermions, and organic compounds is one of the most challenging issues in condensed-matter physics. Clear evidence for an electron-phonon mechanism in conventional superconductors is s...

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Bibliographic Details
Published in:Journal of physics. Conference series 2013-07, Vol.449 (1), p.12029-12
Main Authors: Tada, Y, Fujimoto, S, Kawakami, N, Hattori, T, Ihara, Y, Ishida, K, Deguchi, K, Sato, N K, Satoh, I
Format: Article
Language:English
Subjects:
Condensed matter physics
ELECTRICAL CONDUCTIVITY
Electron states
Fermions
Ferromagnetism
Fluctuation
Isotope effect
MAGNETIC FIELD
Magnetic fields
MAGNETIC PROPERTIES
Magnetic variations
MATHEMATICAL ANALYSIS
ORGANIC COMPOUNDS
Phonons
Physics
SUPERCONDUCTIVITY
SUPERCONDUCTORS
Transition temperature
Unconventional superconductivity
Unconventional superconductors
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Summary:Identification of pairing mechanisms leading to the unconventional superconductivity realized in copper-oxide, heavy-fermions, and organic compounds is one of the most challenging issues in condensed-matter physics. Clear evidence for an electron-phonon mechanism in conventional superconductors is seen by the isotope effect on the superconducting transition temperatures TSC, since isotopic substitution varies the phonon frequency without affecting the electronic states. In unconventional superconductors, magnetic fluctuations have been proposed to mediate superconductivity, and considerable efforts have been made to unravel relationships between normal-state magnetic fluctuations and superconductivity. Here, we show that characteristic experimental results on the ferromagnetic (FM) superconductor UCoGe (TCurie ~ 2.5 K and TSC ~ 0.6 K) can be understood consistently within a scenario of the spin-triplet superconductivity induced by FM spin fluctuations. Temperature and angle dependencies of the upper critical magnetic field of the superconductivity (Hc2) are calculated on the basis of the above scenario by solving the Eliashberg equation. Calculated Hc2 well agrees with the characteristic experimental results observed in UCoGe. This is a first example that FM fluctuations are shown to be a pairing glue of superconductivity.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/449/1/012029