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SUMMARY:Orbital-dependent scattering in Sr2RuO4 and FeSe probed by uniaxia
 l stress - Dr. Clifford Hicks\, University of Birmingham\, Max Planck Inst
 itute for Chemical Physics of Solids\, Dresden\, Germany
DTSTART:20220316T111500Z
DTEND:20220316T123000Z
UID:TALK168863@talks.cam.ac.uk
CONTACT:Malte Grosche
DESCRIPTION:Sr2RuO4 and FeSe are both among the major mysteries of modern 
 condensed matter physics. Sr2RuO4 has a superconductivity that does not ap
 pear to be explainable by any known mechanism. FeSe shows electronically-d
 riven nematicity\, in the absence of any other electronic order\, and the 
 mechanism is not clear. In this talk\, I will demonstrate the use of strai
 n-tuning to probe k-dependent scattering in both of these materials. In Sr
 2RuO4\, we find that tuning through a Lifshitz transition drastically redu
 ces the scattering on sections of Fermi surface with dxy orbital weight\, 
 but not sections with dxz and dyz weight. This orbital dependence of the s
 cattering is evidence for Hund’s-driven decoupling. Hund’s interaction
 s may even drive the superconducting pairing. In FeSe\, we find evidence t
 hat its nematic resistive anisotropy is driven by spin fluctuations in the
  dyz orbital\, and that these spin fluctuations might not be the origin of
  the nematicity.
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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