Anomalous Behavior of Superconducting-Normal Mesoscopic Structures near<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Shapira, Shachar; Linfield, Edmund H.; Lambert, Colin J.; Seviour, Rebecca; Volkov, A. N.; Zaitsev, A.V.

doi:10.1103/physrevlett.84.159

Cited by 11 publications

(15 citation statements)

References 18 publications

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“…One can see that this dependence has two maxima. The resistance of a S/N system has a similar temperature dependence with two maxima [28]. Moreover, for ∆/ǫ S 1.5 the thermoemf drops to zero at a certain temperature, remains very small at larger T and increases again at temperatures close to T c .…”

Section: Resultsmentioning

confidence: 83%

Long-range thermoelectric effects in mesoscopic superconductor–normal metal structures

Volkov

Павловский

2005

Phys. Rev. B

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We consider a mesoscopic four-terminal superconductor/normal metal (S/N) structure in the presence of a temperature gradient along the N wire. A thermoemf arises in this system even in the absence of the thermoelectric quasiparticle current if the phase difference between the superconductors is not zero. We show that the thermoemf is not small in the case of a negligible Josephson coupling between two superconductors. It is also shown that the thermoelectric voltage has two maxima: one at a low temperature and another at a temperature close to the critical temperature. The obtained temperature dependence of the thermoemf describes qualitatively experimental data.

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Section: Resultsmentioning

confidence: 83%

Long-range thermoelectric effects in mesoscopic superconductor–normal metal structures

Volkov

Павловский

2005

Phys. Rev. B

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“…Theoretical explanations for the non-monotonic behavior of the resistance variation as a function of the temperature T or voltage V in S/N structures have been presented by Artemenko et al (1979);Nazarov and Stoof (1996); Shapira et al (2000); Volkov et al (1996Volkov et al ( , 1993. Such a variation of the resistance of the normal metal wire can be explained in terms of the proximity effect that leads to the penetration of the condensate into the N wire.…”

Section: Long-range Proximity Effectmentioning

confidence: 98%

“…The experimentally observed changes of the resistance can be both positive (δR > 0) and negative (δR < 0) (Quirion et al, 2002;Shapira et al, 2000). The increase or decrease of the resistance R depends, in particular, on the interface resistance R S/N .…”

Section: Long-range Proximity Effectmentioning

confidence: 99%

Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures

2005

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We consider novel unusual effects in superconductor-ferromagnet (S/F) structures. In particular we analyze the triplet component (TC) of the condensate generated in those systems.This component is odd in frequency and even in the momentum, which makes it insensitive to non-magnetic impurities. If the exchange field is not homogeneous in the system the triplet component is not destroyed even by a strong exchange field and can penetrate the ferromagnet over long distances. Some other effects considered here and caused by the proximity effect are: enhancement of the Josephson current due to the presence of the ferromagnet, induction of a magnetic moment in superconductors resulting in a screening of the magnetic moment, formation of periodic magnetic structures due to the influence of the superconductor, etc. We compare the theoretical predictions with existing experiments.

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“…Experimentally, near-T c local maxima were found for 0 (T) in Ag-Nb point contacts and junctions formed by Ag with the superconducting oxide Nd-Ce-Cu-O, 10 and recently in Al/n-GaAs structures at temperatures 20 mK lower than T c . 11 Zerotemperature conductance peaks were observed for superconductor-semiconductor junctions 12 and a finitetemperature peak was detected in the experiments 13,14 with mesoscopic N-S structures. Figure 1͑b͒ demonstrates the results of simulations for a ͑110͒ oriented d x 2 Ϫy 2-wave superconductor when the distinction between s-and d-wave symmetries is mostly pronounced.…”

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confidence: 93%

Temperature-dependent transport characteristics of quasiballistic normal-metal–superconductor junctions

2000

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We study the temperature effect on the zero-bias conductance and current fluctuations in a two-terminal heterostructure with a mesoscopic normal region connected to normal and superconducting reservoirs. For a quasiballistic regime, the shape of the conductance-voltage characteristic and its temperature behavior for an s-wave superconductor strongly depends on the transmission properties of the normal interlayer. On the contrary, in the low-frequency limit, the near-zero-voltage current noise power versus temperature is insensitive to the nature of the transition region but dramatically changes for different pairing states of the superconducting electrode. The relevant experiment could serve as a diagnostic tool to identify the symmetry of the superconducting order parameter in high-temperature superconductors.

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Anomalous Behavior of Superconducting-Normal Mesoscopic Structures nearTc

Cited by 11 publications

References 18 publications

Long-range thermoelectric effects in mesoscopic superconductor–normal metal structures

Long-range thermoelectric effects in mesoscopic superconductor–normal metal structures

Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures

Temperature-dependent transport characteristics of quasiballistic normal-metal–superconductor junctions

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