Abstract

We have developed a scanning tunneling microscope which can be operated at low temperatures down to 2.2 K and in high magnetic fields up to 14.5 T. In 2H−NbSe2 we have succeeded in observing a vortex lattice up to 2.5T at 2.2K through measurements of a local density of states of quasi-particles, N s (E,r), and investigated how the vortex lattice disappear as the applied magnetic field approaches Hc2,(∼3T). It has been found that the size of the vortex core does not so much depend on applied magnetic fields and that N s (E,r) gradually becomes equal inside and outside the vortex core near Hc2.

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