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Superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe

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arxiv 1112.2812 v1 pith:CEQRJJWJ submitted 2011-12-13 cond-mat.supr-con cond-mat.str-el

T. Hattori , Y. Ihara , Y. Nakai , K. Ishida , Y. Tada , S. Fujimoto , N. Kawakami , E. Osaki
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K. Deguchi N. K. Sato I. Satoh
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classification cond-mat.supr-concond-mat.str-el
keywords fluctuationssuperconductivitylongitudinalucogespinalongaxisferromagnetic
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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.

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