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American Institute of Physics, Journal of Applied Physics, 5(114), p. 053904

DOI: 10.1063/1.4817415

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Surface bulk differences in a conventional superconductor, ZrB(12)

Journal article published in 2013 by Sangeeta Thakur, Deepnarayan Biswas ORCID, Nishaina Sahadev, P. K. (Pabitra K.) Biswas, Geetha Balakrishnan, Kalobaran Maiti
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We studied the electronic structure of a conventional superconductor, ZrB12, using high resolution x-ray photoemission spectroscopy and single crystalline samples. Experimental results with different bulk sensitivity reveal boron deficiency at the surface while the bulk is stoichiometric and different valence states of Zr at the surface relative to those in the bulk. Signature of satellite features is observed in the Zr core level spectra corresponding to the bulk of the material suggesting importance of electron correlation among the conduction electrons in the bulk while the surface appears to be uncorrelated. These results provide an insight on surface-bulk differences, which is important for fabrication of devices based on such superconductors.