Scanning Tunneling Spectroscopy on the novel superconductor CaC6

Abstract

We present scanning tunneling microscopy and spectroscopy of the newly discovered superconductor CaC${}_6$. The tunneling conductance spectra, measured between 3 K 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 $\pm$ 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 to deduce a coherence length in the ab plane ${\xi }_{ab}\simeq$ 33 nm.

References in corpus (1)

• Vortex Imaging in the pi-Band of Magnesium Diboride

Cited by in corpus (18)

• Superconducting density of states and vortex cores of 2H-NbS2
• Experimental demonstration of a two-band superconducting state for lead using scanning tunneling spectroscopy
• Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in CaC6
• Superconductivity in Heavy Alkaline-Earths Intercalated Graphites
• Superconductivity in graphite intercalation compounds
• Evidence for gap anisotropy in CaC6 from directional point-contact spectroscopy
• Unresolved problems in superconductivity of CaC6
• On the correct formula for the lifetime broadened superconducting density of states
• Evidence of Strong-Coupled Superconductivity in CaC6 from Tunneling Spectroscopy
• Quasiparticle spectrum of the cuprate BiSrCaCuO: Possible connection to the phase diagram
• Raman scattering from the CaC6 superconductor in the presence of disorder
• Far-infrared signature of the superconducting gap in intercalated graphite CaC6
• Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the beta-pyrochlore KOs2O6
• Electron Spin Dynamics of the Superconductor CaC6 probed by ESR
• Anisotropic superconductivity in graphite intercalation compound YbC6
• Linear and nonlinear electrodynamic response of bulk CaC6 in the microwave regime
• Microwave losses of bulk CaC6
• Vortex Pinning in Niobium covered by a thin polycrystalline Gold