Scanning tunneling spectroscopy of layers of superconducting 2H-TaSe$_\textbf{2}$: Evidence for a zero bias anomaly in single layers

E. Coronado; E. Navarro-Moratalla; H. Suderow; I. Guillam\'on; J. A. Galvis; J. G. Rodrigo; L. Cario; M. R. Osorio; P. Rodi\`ere; S. Vieira

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Scanning tunneling spectroscopy of layers of superconducting 2H-TaSe₂: Evidence for a zero bias anomaly in single layers

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arxiv 1210.2659 v2 pith:KLPO6MMT submitted 2012-10-09 cond-mat.supr-con

Scanning tunneling spectroscopy of layers of superconducting 2H-TaSe₂: Evidence for a zero bias anomaly in single layers

J. A. Galvis , P. Rodi\`ere , I. Guillam\'on , M. R. Osorio , J. G. Rodrigo , L. Cario , E. Navarro-Moratalla , E. Coronado

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S. Vieira H. Suderow

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keywords tunnelingbiash-taselayerszeroatomsbelowconductance

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We report a characterization of surfaces of the dichalcogenide TaSe$_2$ using scanning tunneling microscopy and spectroscopy (STM/S) at 150 mK. When the top layer has the 2H structure and the layer immediately below the 1T structure, we find a singular spatial dependence of the tunneling conductance below 1 K, changing from a zero bias peak on top of Se atoms to a gap in between Se atoms. The zero bias peak is additionally modulated by the commensurate $3a_0 \times 3a_0$ charge density wave of 2H-TaSe$_2$. Multilayers of 2H-TaSe$_2$ show a spatially homogeneous superconducting gap with a critical temperature also of 1 K. We discuss possible origins for the peculiar tunneling conductance in single layers.

Scanning tunneling spectroscopy of layers of superconducting 2H-TaSe₂: Evidence for a zero bias anomaly in single layers

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