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5. Superconductivity Induced by Longitudinal Ferromagnetic Fluctuations in UCoGe.

Author

Hattori, T., Ihara, Y., Nakai, Y., Ishida, K., Tada, Y., Fujimoto, S., Kawakami, N., Osaki, E., Deguchi, K., Sato, N. K., and Satoh, I.

Subjects
*SUPERCONDUCTIVITY, *LONGITUDINAL method, *FERROMAGNETISM, *FLUCTUATIONS (Physics), *NUCLEAR magnetic resonance spectroscopy, *TEMPERATURE effect, *NUCLEAR spin
Abstract

From detailed angle-resolved NMR and Meissner measurements on a ferromagnetic (FM) supercon-ductor UCoGe (7Curie ∼ 2.5 K and Tsc ∼ 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. [ABSTRACT FROM AUTHOR]

Published
2012
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