Gap structure of the spin-triplet superconductor Sr2RuO4 determined from the field-orientation dependence of the specific heat -: art. no. 047002
Gap structure of the spin-triplet superconductor Sr2RuO4 determined from the field-orientation dependence of the specific heat -: art. no. 047002
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DOI：
10.1103/physrevlett.92.047002
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发表时间：
2004-01-30
影响因子：
8.6
通讯作者：
Maeno, Y
中科院分区：
文献类型：
--
作者：
Deguchi, K;Mao, ZQ;Maeno, Y
报道了在平行于RuO_2平面的磁场作用下，自旋三重态超导体Sr2RuO_4随磁场取向变化的高精度比热。在0.3K以下，首次分辨出了反映超导带隙结构的态密度的四倍振荡。我们还得到了多带超导电性的有力证据，并得出结论：导致超导不稳定性的活动带中的超导带隙受到沿[100]方向最小的调制。
We report the field-orientation dependent specific heat of the spin-triplet superconductor Sr2RuO4 under the magnetic field aligned parallel to the RuO2 planes with high accuracy. Below about 0.3 K, striking fourfold oscillations of the density of states reflecting the superconducting gap structure have been resolved for the first time. We also obtained strong evidence of multiband superconductivity and concluded that the superconducting gap in the active band, responsible for the superconducting instability, is modulated with a minimum along the [100] direction.