Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 12, Pages 3247-3250Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.3247
Keywords
anisotropic superconductor; vortex core; bound states; STS; borocarbides; quantum regime
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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.
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