First observation of the fourfold-symmetric and quantum regime vortex core in YNi2B2C by scanning tunneling microscopy and spectroscopy
First observation of the fourfold-symmetric and quantum regime vortex core in YNi2B2C by scanning tunneling microscopy and spectroscopy
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DOI：
10.1143/jpsj.73.3247
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发表时间：
2004-12-01
影响因子：
1.7
通讯作者：
Nishida, N
中科院分区：
文献类型：
--
作者：
Nishimori, H;Uchiyama, K;Nishida, N
用低温扫描隧道显微镜和能谱测量了0.46K下YNi2B2C孤立涡旋中的局域准粒子态密度N-S(E，r)。在真实空间中，涡核呈四对称星形：在E=0 meV附近，N-S(E，r)向(100)(a轴)方向延伸，并在涡核中心有一个峰值。随着能量的增加，N-S(E，r)峰向(110)方向延伸，N-S(E，r)峰向(110)方向分裂为四个峰。涡核中的N-S(E，r)在强度上表现出电子-空穴的不对称性，这表明首次在量子区域观测到了涡核。
The local quasi-particle density of states, N-s(E, r), in the isolated vortex of YNi2B2C has been measured at 0.46 K by low-temperature scanning tunneling microscopy and spectroscopy. The vortex core is found to be fourfold-symmetric star-shaped in real space: Near E = 0 meV, N-s(E, r) extends toward (100) (the a-axis) and has a peak at the center of the vortex core. With increasing energy, N-s(E, r) comes to extend toward (110) and the peak of N-s(E, r) splits into four peaks toward (110). N-s(E, r) in the vortex core exhibits electron-hole asymmetry with the intensity, indicating the first observation of the vortex core in a quantum regime.