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SUMMARY:JCMS: Inhomogeneity and disorder in unconventional superconductors
DTSTART:20260608T083000Z
DTEND:20260608T100000Z
DTSTAMP:20260607T074200Z
UID:indico-event-9737@indico.fysik.su.se
DESCRIPTION:Speakers: Andreas Kreisel (Uppsala University)\n\nAbstract: Di
 sorder is a common theme in unconventional superconductors due to imperfec
 tions in the growth process when multiple elements are involved\, or even 
 inevitable because the material needs to be doped away from nominal charge
  neutrality to reach the superconducting state.\nIn any case\, disorder is
  an opportunity to learn about the superconducting state or specifically p
 robe its response to disorder. In this seminar\, I will review common resu
 lts on disordered unconventional superconductors and then move to two case
  studies where new twists of the superconducting response is apparent.\nTh
 e first example is unconventional superconductivity on the kagome and Lieb
  lattice where it turns out that the superconducting order parameter that 
 sums to zero\, still can be robust against point like disorder. In the sam
 e way\, these systems show a Hebel Slichter peak in the temperature-depend
 ent spin-relaxation rate\, a property that was previously only assigned to
  conventional non-sign changing order parameters.\nIn the second example\,
  I will challenge the general notion that only overdoped cuprates approach
  the well defined Landau-BCS paradigm at large hole doping. With this work
  we connect to recent experimental data from tunneling spectroscopy and an
 gle-resolved photo emission spectroscopy where gap-filling and a prominent
  shoulder at a second energy scale has been observed. The key ingredient f
 or the theory is an inhomogeneous pairing interaction on the nanometer len
 gth scale which produces these features independent of the details of the 
 modeling. We use traditional BCS mean-field calculations and time-dependen
 t Ginzburg-Landau calculations to obtain the order parameter and density o
 f states finding that the spectral gaps fill\, rather than close. The resu
 lt is a local spectrum that remains inhomogeneous at the critical temperat
 ure Tc: the local density of states is mostly given by the normal state\, 
 but with isolated superconducting islands characterized by a spectral pseu
 dogap.\n\nhttps://indico.fysik.su.se/event/9737/
LOCATION:Albano 3: 6228 - Mega (22 seats) (Albano Building 3)
URL:https://indico.fysik.su.se/event/9737/
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