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arxiv: 0907.4735 · v1 · submitted 2009-07-27 · ❄️ cond-mat.dis-nn · cond-mat.str-el· cond-mat.supr-con

Temperature dependence of resistivity and Hall-coefficient in a strongly disordered metal: NbN

Madhavi Chand , Archana Mishra , Y. M. Xiong , Anand Kamlapure , S. P. Chockalingam , John Jesudasan , Vivas Bagwe , Mintu Mondal
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P. W. Adams Vikram Tripathi Pratap Raychaudhuri
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classification ❄️ cond-mat.dis-nn cond-mat.str-elcond-mat.supr-con
keywords disorderedfilmsbehaviortemperaturedependencefilmmetalresistivity
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We report the temperature dependence of resistivity (rho) and Hall coefficient (R_H) in the normal state of homogeneously disordered epitaxial NbN thin films with kFl~3.27-10.12. The superconducting transition temperature (Tc) of these films varies from 8.13K to 16.8K. While our least disordered film displays usual metallic behavior, for all the films with kFl<8.13, both and are negative up to 300K. We observe that R_H(T) varies linearly with rho(T) for all the films. Measurements performed on a 2nm thick Be film shows similar behavior >. This behavior is inconsistent with existing theories of localization and e-e interactions in a disordered metal.

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