Transverse resistance due to electronic inhomogeneities in superconductors

Shamashis Sengupta; Alireza Farhadizadeh; Joe Youssef; Sara Loucif; Florian Pallier; Louis Dumoulin; Kasturi Saha; Sumiran Pujari; Magnus Óden; Claire Marrache-Kikuchi; Miguel Monteverde

doi:10.1103/bgbf-b39l

Transverse resistance due to electronic inhomogeneities in superconductors

Shamashis Sengupta, Alireza Farhadizadeh, Joe Youssef, Sara Loucif, Florian Pallier, Louis Dumoulin, Kasturi Saha, Sumiran Pujari, Magnus Óden, Claire Marrache-Kikuchi, Miguel Monteverde

DOI 10.1103/bgbf-b39l · Physical Review B

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Abstract

Typical length scales associated with superconductivity are in the range of nanometers. Accordingly, measurements of electrical resistance over much larger distances are supposed to be insensitive to details of spatial inhomogeneities of superconducting order. We observe that current paths adopt a highly nonuniform distribution at the onset of the superconducting transition which is manifested in the development of a finite transverse resistance. The anisotropic distribution of current density indicates the emergence of electronic inhomogeneities perceivable over macroscopic distances, characterized by a length scale which is unrelated to the structural properties of the superconducting films. Our experiments reveal the ubiquitous nature of this phenomenon in conventional superconductors.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.6	Pressure not reported	unknown
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.2	Pressure not reported	unknown
TlBa2Ca2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Pd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ba0.5K0.5Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown