Measurement of the 101Ru-Knight shift of superconducting Sr2RuO4 in a parallel magnetic field.
Measurement of the 101Ru-Knight shift of superconducting Sr2RuO4 in a parallel magnetic field.
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DOI：
10.1103/physrevlett.93.167004
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发表时间：
2004-10
影响因子：
8.6
通讯作者：
H. Murakawa;K. Ishida;K. Kitagawa;Z. Mao;Y. Maeno
中科院分区：
文献类型：
--
作者：
H. Murakawa;K. Ishida;K. Kitagawa;Z. Mao;Y. Maeno
在平行于c轴（垂直于RuO_2平面）的磁场下，测量了自旋三重态超导体Sr_2RuO_4的~（101）Ru-Knight位移（~（101）K）。我们成功地测量了K（c）的字段范围从200至1200 Oe和温度下降到80 mK，使用核四极共振光谱。发现（101）K（c）在通过H（c 2）和T（c）超过200 Oe时不随磁场和温度变化，这表明SC态的自旋磁化率沿着c轴不发生变化，至少在磁场大于200 Oe时是这样，这意味着当磁场作用在c轴上时，SC d矢量在RuO 2平面内.
101Ru-Knight shift (101K) in the spin-triplet superconductor Sr2RuO4 was measured under magnetic fields parallel to the c axis (perpendicular to the RuO2 plane), which is the promising superconducting (SC) d-vector direction in a zero field. We succeeded in measuring K(c) in the field range from 200 to 1200 Oe and at temperatures down to 80 mK, using nuclear-quadrupole-resonance spectra. We found that (101)K(c) is invariant with respect to the field and temperature on passing through H(c2) and T(c) above 200 Oe. This indicates that the spin susceptibility along the c axis does not change in the SC state, at least, in the field greater than 200 Oe. The results imply that the SC d vector is in the RuO2 plane when the magnetic field is applied to the c axis.