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

Abstract

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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References in corpus (9)

• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Superconducting properties and Hall Effect of epitaxial NbN thin films
• Localized Superconductivity in the Quantum-Critical Region of the Disorder-Driven Superconductor-Insulator Transition in TiN Thin Films
• Experimental evidence for a collective insulating state in two-dimensional superconductors
• Coulomb Gap: How a Metal Film Becomes an Insulator
• Coulomb Gap in a Doped Semiconductor near the Metal-Insulator Transition: Tunneling Experiment and Scaling Ansatz
• Interaction corrections to the Hall coefficient at intermediate temperatures
• Tunneling studies in a homogeneously disordered s-wave superconductor: NbN
• Hall Coefficient in an Interacting Electron Gas

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