Isothermal reentrant effect in a mesoscopic cylindrical structure of a superconductor coated with a normal metal layer

Gogadze, G. A.; Dolya, S. N.

doi:10.1103/physrevb.80.054509

Cited by 2 publications

(3 citation statements)

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“…More recently these types of structures revealed peculiar proximity-induced reentrance effects in χ with changing H a or temperature, T [21][22][23] . These effects were attributed to an enhancement of the paramagnetic contribution to the susceptibility [24][25][26] , which in the diffusive regime, can depend on the existence of electron-electron interactions in the N layer 29 . Meissner effects in monodomain ferromagnets in contact with superconductors have also been considered 27,28 .…”

Section: Introductionmentioning

confidence: 99%

Meissner effect probing of odd-frequency triplet pairing in superconducting spin valves

2014

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Superconducting correlations which are long-ranged in magnetic systems have attracted much attention due to their spin-polarization properties and potential use in spintronic devices. Whereas experiments have demonstrated the slow decay of such correlations, it has proven more difficult to obtain a smoking gun signature of their odd-frequency character which is responsible, e.g. for their gapless behavior. We here demonstrate that the magnetic susceptibility response of a normal metal in contact with a superconducting spin-valve provides precisely this signature, namely in form of an anomalous positive Meissner effect which may be tuned back to a conventional negative Meissner response simply by altering the magnetization configuration of the spin-valve.

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Section: Introductionmentioning

confidence: 99%

Meissner effect probing of odd-frequency triplet pairing in superconducting spin valves

2014

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“…9,a. for the branches corresponding to the minimum of the Gibbs free energy [45]: . The magnetic moment M(h) and the free energy Ω(h) as function of the magnetic field are shown in Fig.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The thermodynamic potential of a NS structure in a magnetic field and its magnetic moment (screening current) were calculated in [45]. This section describes the theory of an isothermal reentrant effect.…”

Section: Reentrant Effect Theorymentioning

confidence: 99%

Coherent quantum phenomena in mesoscopic metallic conductors (Review Article)

Gogadze

2010

Low Temperature Physics

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The quantum coherent phenomena in mesoscopic cylindrical metallic conductors have been considered. Pure double-and single-connected normal samples were placed in a longitudinal magnetic field, which generated interference phenomena depending on the magnetic flux through the cross-section of the conductor. The period of the induced oscillations is equal to the flux quantum hc/e of the normal metal. The quantum states are formed in the structures by collisions of the electrons with the dielectric boundary of the sample. The magnetic flux is included in the expression for the spectrum of quasiparticles. The proximity effect and its influence on the modification of the spectrum of quantum coherent phenomena have been investigated. The behavior of cylindrical samples consisting of a superconducting (S) metal with a deposited thin pure normal (N) metal layer has been analyzed. In this structure the electrons are localized in a well bounded by a dielectric on one side and by a superconductor on the other. The specific feature of the generated quantized Andreev levels is that in the varying field H (or temperature T) each of the levels in the well can coincide periodically with the chemical potential of the metal. As a result, the state of the system experiences strong degeneracy and the density of states exhibits resonance spikes of the energy of the NS sample. This makes a significant contribution to the magnetic moment. A theory of the reentrant effect for NS structures has been developed, which interprets the anomalous behavior of the magnetic susceptibility of such structures as a function of the magnetic field and temperatures.

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Isothermal reentrant effect in a mesoscopic cylindrical structure of a superconductor coated with a normal metal layer

Cited by 2 publications

References 20 publications

Meissner effect probing of odd-frequency triplet pairing in superconducting spin valves

Meissner effect probing of odd-frequency triplet pairing in superconducting spin valves

Coherent quantum phenomena in mesoscopic metallic conductors (Review Article)

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