Interplay between quantum fluctuations and reentrant superconductivity with a highly enhanced upper critical field in URhGe
Physical review. B./Physical review. B2016Vol. 93(20)
Citations Over TimeTop 13% of 2016 papers
Y. Tokunaga, Dai Aoki, H. Mayaffre, S. Krämer, M.-H. Julien, C. Berthier, M. Horvatić, H. Sakai, T. Hattori, S. Kambe, Shingo Araki
Abstract
The ferromagnetic superconductor URhGe has been known to exhibit an extremely large enhancement of the upper critical field when the field is confined and rotated in the $(ab)$ crystal plane. Our high-field $^{59}\mathrm{Co}$ NMR measurements on 10% Co-doped URhGe up to 30 T prove that this unconventional behavior of the superconductivity (SC) is associated with a strong anisotropy of field-dependent quantum fluctuations near a tricritical point. These fluctuations are rapidly suppressed by the field component along the $c$ axis, while being unaffected by any field component along the $a$ axis. The observed close interplay between the SC and quantum fluctuations strongly supports a pairing mechanism mediated by these fluctuations in URhGe.
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