Author(s): Y. Tokunaga, D. Aoki, H. Mayaffre, S. Krämer, M.-H. Julien, C. Berthier, M. Horvatić, H. Sakai, S. Kambe, and S. Araki
NMR measurements near the quantum tricritical point show that reentrance of superconductivity at high fields requires longitudinal fluctuations (parallel to the applied field). These experimental results will require revision of theoretical work, which to date has included only transverse fluctuations.
[Phys. Rev. Lett. 114, 216401] Published Wed May 27, 2015