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DTSTART;TZID=Europe/Berlin:20261014T140000
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DTSTAMP:20261013T092048Z
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UID:7154-1791986400-1791990000@www.trr360.de
SUMMARY:TRR 360 Seminar:Paramagnetic limit of spin-triplet superconductors Thomas Bernat
DESCRIPTION:Paramagnetic limit of spin-triplet superconductors \nDr. Thomas Bernat \nDepartment of Physics and Astronomy\, Uppsala University\, Sweden \n  \nAn upper critical field above the Pauli limit is often taken as a hint of spin-triplet pairing\, since equal-spin triplet pairs are insensitive to the Zeeman field. In real materials\, however\, strong spin-orbit coupling pins the d-vector to the crystal axes. Generically\, the condensate is then a mixture of equal-spin and opposite-spin pairs for any field direction.I’ll present two main results. First\, all triplet states are Pauli limited at finite temperature\, but this limit diverges as a power law when T ¡æ 0. Second\, for a d-vector with fixed direction and a slightly tilted field\, the phase diagram becomes surprisingly rich. Two tricritical points appear along the upper critical line\, with a first-order transition between them\, and a first-order line between two distinct superconducting phases can also emerge. I’ll show how a Landau expansion to eighth order in the gap explains this structure.Finally\, we’ll discuss UPt3\, where the model predicts a strongly temperature-dependent H_c2 anisotropy at low T. This calls for measurements at lower temperatures than those done so far. \n\n\n\n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminarparamagnetic-limit-of-spin-triplet-superconductors-thomas-bernat/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
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