Superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe

From detailed angle-resolved NMR and Meissner measurements on a ferromagnetic (FM) superconductor UCoGe (T(Curie)∼2.5  K and T(SC)∼0.6  K), we show that superconductivity in UCoGe is tightly coupled with longitudinal FM spin fluctuations along the c axis. We found that magnetic fields along the c ax...

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Bibliographic Details
Published in:Physical review letters 2012-02, Vol.108 (6), p.066403-066403, Article 066403
Main Authors: Hattori, T, Ihara, Y, Nakai, Y, Ishida, K, Tada, Y, Fujimoto, S, Kawakami, N, Osaki, E, Deguchi, K, Sato, N K, Satoh, I
Format: Article
Language:English
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Summary:From detailed angle-resolved NMR and Meissner measurements on a ferromagnetic (FM) superconductor UCoGe (T(Curie)∼2.5  K and T(SC)∼0.6  K), we show that superconductivity in UCoGe is tightly coupled with longitudinal FM spin fluctuations along the c axis. We found that magnetic fields along the c axis (H∥c) strongly suppress the FM fluctuations and that the superconductivity is observed in the limited magnetic-field region where the longitudinal FM spin fluctuations are active. These results, combined with model calculations, strongly suggest that the longitudinal FM spin fluctuations tuned by H∥c induce the unique spin-triplet superconductivity in UCoGe. This is the first clear example that FM fluctuations are intimately related with superconductivity.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.066403