Tunneling Spectroscopy in Small Grains of Superconducting MgB2

G. Rubio-Bollinger; H. Suderow; S. Vieira

doi:10.1103/PhysRevLett.86.5582

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Tunneling Spectroscopy in Small Grains of Superconducting MgB2

G. Rubio-Bollinger, H. Suderow, S. Vieira

DOI 10.1103/PhysRevLett.86.5582 · Physical Review Letters

T1

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Abstract

We report on tunneling spectroscopy experiments in small grains of the new binary intermetallic superconductor MgB2. Experiments have been performed at 2.5 K using a low temperature scanning tunneling microscope. Good fit to the BCS model is obtained, with a gap value of 2 meV. In the framework of this model, this value should correspond to a surface critical temperature of 13.2 K. No evidence of gap anisotropy has been found.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37.5	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13.2	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown