Absence of O Knight-Shift Changes across the First-Order Phase Transition Line in SrRuO
arXiv:1611.01620 · doi:10.1103/PhysRevB.94.180507
Abstract
We performed O nuclear magnetic resonance measurements on superconducting (SC) SrRuO under in-plane magnetic fields. We found that no new signal appears in the SC state and that the O 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 SrRuO, 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.
5 pages, 3 figures; to appear in Physical Review B Rapid Communications
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