Absence of the O-17 Knight-shift changes across the first-order phase transition line in Sr2RuO4

作者：Manago Masahiro^*; Ishida Kenji; Mao Zhiqiang; Maeno Yoshiteru

来源：Physical Review B, 2016, 94(18): 180507.

DOI：10.1103/PhysRevB.94.180507

We performed O-17 nuclear magnetic resonance measurements on superconducting (SC) Sr2RuO4 under in-plane magnetic fields. We found that no new signal appears in the SC state and that the O-17 Knight shifts obtained from the double-site measurements remain constant across the first-order phase-transition line, as well as across the second-order phase-transition line as already reported. The present results indicate that the SC spin susceptibility does not decrease in the high-field region, although a magnetization jump in the SC state was reported at low temperatures. Because the spin susceptibility is unchanged in the SC state in Sr2RuO4, we suggest that the first-order phase transition across the upper critical field should be interpreted as a depairing mechanism other than the conventional Pauli-paramagnetic effect.

• 出版日期2016-11-16