Te-NMR study on a single crystal of heavy fermion superconductor UTe
Tokunaga, Yo
; Sakai, Hironori
; Kambe, Shinsaku
; Hattori, Taisuke; Higa, Nonoka; Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Nakamura, Ai*; Shimizu, Yusei*; Homma, Yoshiya*; Li, D. X.*; Honda, Fuminori*; Aoki, Dai*
We report
Te-NMR studies on a newly discovered heavy fermion superconductor UTe
. Using a single crystal, we have measured the
Te-NMR Knight shift
and spin-lattice relaxation rate
for fields along the three orthorhombic crystal axes. The data confirm a moderate Ising anisotropy for both the static (
) and dynamical susceptibilities (
) in the paramagnetic state above about 20 K. Around 20 K, however, we have observed a sudden loss of NMR spin-echo signal due to sudden enhancement of the NMR spin-spin relaxation rate
, when the field is applied along the easy axis of magnetization (=
axis). This behavior suggests the development of longitudinal magnetic fluctuations along the
axis at very low frequencies below 20 K.