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Superconducting Pb Island Nanostructures Studied by Scanning Tunneling Microscopy and Spectroscopy

2008; American Physical Society; Volume: 101; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.101.167001

1092-0145

Takahiro Nishio, Toshu An, Atsushi Nomura, Kousuke Miyachi, Toyoaki Eguchi, Hideaki Sakata, Shi‐Zeng Lin, Nobuhiko Hayashi, Noriyuki Nakai, Masahiko Machida, Yukio Hasegawa,

Magnetic properties of thin films

Superconductivity of nanosized Pb-island structures whose radius is 0.8 to 2.5 times their coherence length was studied under magnetic fields using low-temperature scanning tunneling microscopy and spectroscopy. Spatial profiles of superconductivity were obtained by conductance measurements at zero-bias voltage. Critical magnetic fields for vortex penetration and expulsion and for superconductivity breaking were measured for each island. The critical fields depending on the lateral size of the islands and existence of the minimum lateral size for vortex formation were observed.