Scanning tunneling spectroscopy on the novel superconductor CaC6

被引:63
作者
Bergeal, N.
Dubost, V.
Noat, Y.
Sacks, W.
Roditchev, D.
Emery, N.
Herold, C.
Mareche, J. -F.
Lagrange, P.
Loupias, G.
机构
[1] Univ Nancy 1, Lab Chim Solide Mineral, CNRS, UMR 7555, F-54506 Vandoeuvre Les Nancy, France
[2] Univ Paris 06, IMPMC, Inst Mineral & Phys Milieux Condenses, UMR 7590, F-75252 Paris 05, France
关键词
D O I
10.1103/PhysRevLett.97.077003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present scanning tunneling microscopy and spectroscopy of the newly discovered superconductor CaC6. The tunneling conductance spectra, measured between 3 and 15 K, show a clear superconducting gap in the quasiparticle density of states. The gap function extracted from the spectra is in good agreement with the conventional BCS theory with Delta(0)=1.6 +/- 0.2 meV. The possibility of gap anisotropy and two-gap superconductivity is also discussed. In a magnetic field, direct imaging of the vortices allows us to deduce a coherence length in the ab plane xi(ab)similar or equal to 33 nm.
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页数:4
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