Scanning Tunneling Spectroscopy on Single Crystal MgB2

Details Scanning Tunneling Spectroscopy on Single Crystal MgB2 Scanning Tunneling Spectroscopy on Single Crystal MgB2

2002-09-15

arxiv.org/abs/cond-mat/0209345v1

Physica C, vol. 385, pp. 169-176 (2003)

Physics

Condensed Matter

Superconductivity

12 pages, 7 figs. Submitted to Physica C

Scientific paper

10.1016/S0921-4534(02)02301-8

We report on the results of scanning tunneling spectroscopy measurements on single crystals of Mg2. Tunneling was performed both parallel and perpendicular to the crystalline c-axis. In the first case, a single superconducting gap (Delta_pi = 2.2 meV) associated with the pi-band is observed. Tunneling parallel to the ab-plane reveals an additional, larger gap (Delta_sigma ~ 7 meV) originating in the highly two-dimensional sigma-band. Vortex imaging in the pi-band was performed with the field and tunnel current parallel to the c-axis. The vortices have a large core size compared to estimates based on Hc2, and show an absence of localized states in the core. Furthermore, superconductivity between the vortices is rapidly suppressed by an applied field. A comparison to specific heat measurements is performed.

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