Depairing current density of Nd2−xCexCuO4−δ superconducting films

Kunchur, Milind N.; Dean, Charles L.; Liang, Manlai; Moghaddam, Nahid Shayesteh; Guarino, Anita; Nigro, A.; Grimaldi, Gaia; Leo, Antonio

doi:10.1016/j.physc.2013.08.005

Cited by 14 publications

(10 citation statements)

References 19 publications

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“…The corresponding zero-T Pearl screening length 16 is Λ(0) = 2λ 2 /d = 4.4 µm. As emphasized in our earlier work 5,17 , the combination of B c2 and j d provides a useful method for obtaining a single-band λ purely from transport measurements, which directly gives an absolute value of λ(0) and is unaffected by magnetism in the material.…”

Section: 92 (Where Rn Is the Normal-state Resistance) (B) The Same mentioning

confidence: 99%

Current-induced depairing in theBi2Te3/FeTeinterfacial superconductor

et al. 2015

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Section: 92 (Where Rn Is the Normal-state Resistance) (B) The Same mentioning

confidence: 99%

Current-induced depairing in theBi2Te3/FeTeinterfacial superconductor

et al. 2015

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“…It requires a minimal amount of material (typically just a microbridge or nanobridge), does not require the complicated meander patterning needed for a kinetic-inductance mea-surement, and is unaffected by a material's normal-state magnetism that affects inductive measurements of ρ s as discussed above. This immunity to material magnetism was used to good advantage for directly obtaining ρ s in the Nd 2−x Ce x CuO 4 superconductor for the first time [21]. Furthermore, unlike some of the methods for measuring λ that do not provide an accurate absolute value but only provide the temperature variation λ(T )/λ(0), j d does provide the absolute value of λ and ρ s and can hence provide information on the total carrier concentration n.…”

Section: Superfluid Densitymentioning

confidence: 99%

Evaluating Superconductors through Current Induced Depairing

Kunchur

2019

Condensed Matter

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The phenomenon of superconductivity occurs in the phase space of three principal parameters: temperature T, magnetic field B, and current density j. The critical temperature Tc is one of the first parameters that is measured and in a certain way defines the superconductor. From the practical applications point of view, of equal importance is the upper critical magnetic field Bc2 and conventional critical current density jc (above which the system begins to show resistance without entering the normal state). However, a seldom-measured parameter, the depairing current density j d , holds the same fundamental importance as Tc and Bc2, in that it defines a boundary between the superconducting and normal states. A study of j d sheds unique light on other important characteristics of the superconducting state such as the superfluid density and the nature of the normal state below Tc, information that can play a key role in better understanding newly-discovered superconducting materials. From a measurement perspective, the extremely high values of j d make it difficult to measure, which is the reason why it is seldom measured. Here, we will review the fundamentals of current-induced depairing and the fast-pulsed current technique that facilitates its measurement and discuss the results of its application to the topological-insulator/chalcogenide interfacial superconducting system.

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“…2, a way to obtain λ and ρ s through purely transport measurements that is not directly affect by the material's magnetism. We exploited this fact to obtain ρ s in Nd 2−x Ce x CuO 4 , where a large paramagnetic background due to Nd 3+ moments precludes an inductive measurement [15]. As soon as an applied magnetic field exceeds B c1 , flux vortices penetrate the sample.…”

Section: Current Induced Pair Breakingmentioning

confidence: 99%

Dissipative-regime measurements as a tool for confirming and characterizing near-room-temperature superconductivity

Dean

Kunchur

2017

Quantum Stud.: Math. Found.

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The search for new superconducting materials approaching room temperature benefits from having a variety of testing methodologies to confirm and characterize the presence of superconductivity. Often the first signatures of new superconducting species occur incompletely and in very small volume fractions. These trace amounts may be too weak to produce an observable Meissner effect and the resistance may not go completely to zero if the percolation threshold is not met. Under these conditions, secondary behavior-such as transitions or cross overs in the temperature dependence of magnetoresistance, magnetic irreversibility, or thermopower-are often used as indications for the presence of superconductivity. Our group has developed a rather unique set of fast-timescale and dissipative transport measurements that can provide another tool set for confirming and characterizing suspected superconductivity. Here we provide some background for these methods and elucidate their collaborative value in the search for new superconducting materials.

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Depairing current density of Nd2−xCexCuO4−δ superconducting films

Cited by 14 publications

References 19 publications

Current-induced depairing in theBi2Te3/FeTeinterfacial superconductor

Current-induced depairing in theBi2Te3/FeTeinterfacial superconductor

Evaluating Superconductors through Current Induced Depairing

Dissipative-regime measurements as a tool for confirming and characterizing near-room-temperature superconductivity

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