Journal
PHYSICAL REVIEW LETTERS
Volume 87, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.177008
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We report on the temperature dependence of the quasiparticle density of states in the simple binary compound MgB2 directly measured using scanning tunneling microscope (STM). To achieve high quality tunneling conditions. a small crystal of MgB2 is used as a tip in the STM experiment. The sample is chosen to be a 2H-NbSe2 single crystal presenting an atomically flat surface. At low temperature the tunneling conductance spectra show a gap at the Fermi energy followed by two well-pronounced conductance peaks on each side. They appear at voltages V-S similar or equal to 3.8 mV and V-L similar or equal to +/- 7.8 mV. With rising temperature both peaks disappear at the T-C of the bulk MgB2, a behavior consistent with the model of two-gap superconductivity. The possibility of a particular proximity effect is also discussed.
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