H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, BS8 1TL, United Kingdom.
Phys Rev Lett. 2012 May 4;108(18):187003. doi: 10.1103/PhysRevLett.108.187003.
The upper critical field H(c2) of purple bronze Li0:9Mo6O17 is found to exhibit a large anisotropy, in quantitative agreement with that expected from the observed electrical resistivity anisotropy. With the field aligned along the most conducting axis, H(c2) increases monotonically with decreasing temperature to a value 5 times larger than the estimated paramagnetic pair-breaking field. Theories for the enhancement of H(c2) invoking spin-orbit scattering or strong-coupling superconductivity are shown to be inadequate in explaining the observed behavior, suggesting that the pairing state in Li0:9Mo6O17 is unconventional and possibly spin triplet.
紫铜锂 Li0.9Mo6O17 的上临界场 H(c2) 表现出很大的各向异性，与观察到的电导率各向异性所预期的定量一致。当磁场沿最导电轴排列时，H(c2) 随温度的降低单调增加，达到比估计的顺磁对断裂场大 5 倍的值。为解释观察到的行为而提出的增强 H(c2) 的理论，如自旋轨道散射或强耦合超导理论，被证明是不够的，这表明 Li0.9Mo6O17 的配对状态是非常规的，可能是自旋三重态。
