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Tunneling spectroscopy of the superconducting state of URu2Si2

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arxiv 1201.1865 v2 pith:IYFB3TMN submitted 2012-01-09 cond-mat.supr-con cond-mat.str-el

Tunneling spectroscopy of the superconducting state of URu2Si2

A. Maldonado , I. Guillamon , J. G. Rodrigo , H. Suderow , S. Vieira , D. Aoki , J. Flouquet This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords superconductingtunnelingfermicloseconductancecouplingcurvesdensity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present measurements of the superconducting gap of URu$_2$Si$_2$ made with scanning tunneling microscopy (STM) using a superconducting tip of Al. We find tunneling conductance curves with a finite value at the Fermi level. The density of states is V shaped at low energies, and the quasiparticle peaks are located at values close to the expected superconducting gap from weak coupling BCS theory. Our results point to rather opened gap structures and gap nodes on the Fermi surface.

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