论文标题
SR $ _2 $ ruo $ _4 $的偶然性超导性的证据
Evidence for even parity unconventional superconductivity in Sr$_2$RuO$_4$
论文作者
论文摘要
SR $ _2 $ ruo $ _4 $的超导订单参数对称性的明确识别在四分之一多世纪以来一直难以捉摸。虽然手性$ p $ - 波的基础状态类似于超级流体$^3 $ he- $ a $最近才排除在外，但其他提议的$ p $ - 波浪场景仍然可行。在此，将依赖于场的$^{17} $ O骑士移位测量与相应的特定热量测量值进行了比较。我们得出的结论是，仅预期的场诱导的准粒子响应可以考虑转移结果。 $ <10 \％$的正常状态敏感性的凝结磁反应的上限足以排除奇数候选者。
Unambiguous identification of the superconducting order parameter symmetry of Sr$_2$RuO$_4$ has remained elusive for more than a quarter century. While a chiral $p$-wave ground state analogue to superfluid $^3$He-$A$ was ruled out only very recently, other proposed $p$-wave scenarios are still viable. Here, field-dependent $^{17}$O Knight shift measurements are compared to corresponding specific heat measurements, previously reported. We conclude that the shift results can be accounted for by the expected field-induced quasiparticle response only. An upper bound for the condensate magnetic response of $<10\%$ of the normal state susceptibility is sufficient to exclude odd-parity candidates.
