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Large Thermoelectric Effects in Unconventional Superconductors.

Tomas Löfwander (Institutionen för mikroteknologi och nanovetenskap) ; Mikael Fogelström (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik)
Physical Review B Vol. 70 (2004), 2, p. 024515.
[Artikel, refereegranskad vetenskaplig]

We present analytic and numerical results for the thermoelectric effect in unconventional superconductors with a dilute random distribution of impurities, each scattering isotropically but with a phase shift intermediate between the Born and unitary limits. The thermoelectric response function has a linear temperature dependence at low temperatures, with a slope that depends on the impurity concentration and phase shift. Although the thermoelectric effect vanishes identically in the strict Born and unitary limits, even a small deviation of the phase shift from these limits leads to a large response, especially in clean systems. We also discuss possibilities of measuring counterflowing supercurrents in a SQUID-setup. The nonquantized thermoelectrically induced flux can easily be of the order of a percent of the flux quantum in clean systems at 4He temperatures.

Denna post skapades 2006-08-29. Senast ändrad 2009-02-16.
CPL Pubid: 1735


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