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SUMMARY:Unconventional pressure dependence of the superfluid density in to
 pological superconductor α−PdBi2
DTSTART;VALUE=DATE-TIME:20220901T094000Z
DTEND;VALUE=DATE-TIME:20220901T100000Z
DTSTAMP;VALUE=DATE-TIME:20220826T121522Z
UID:indico-contribution-3650@indico.stfc.ac.uk
DESCRIPTION:Speakers: Debarchan Das (Paul Scherrer Institute)\nThe Pd-Bi f
 amily of compounds has become quite popular system to explore topological 
 superconductivity due to their intrinsic capability to maintain strong spi
 n orbit coupling (SOC). Amongst various members of this family\, $\\alpha$
 -PdBi$_2$ turns out to be very promising due to its superconducting ($T_c$
  = 1.7 K) as well as topological properties such as Dirac point at 1.26 eV
  below the Fermi energy at the zone center\, Rashba state near the Fermi e
 nergy etc. Notably\, the ARPES data display multiple band crossings at the
  Fermi energy which signals a possible multiple gap superconducting gap st
 ructure in this compound. To explore this interesting aspect\, we investig
 ated the superconducting properties of the topological superconductor α-P
 dBi2 at ambient and external pressures up to 1.77 GPa using muon spin rota
 tion ($\\mu$SR) experiments. The ambient pressure $\\mu$SR measurements de
 monstrate a fully gapped $s$-wave superconducting state in the bulk. The o
 bservation of $s$-wave superconductivity in $\\alpha$-PdBi$_2$ is quite cr
 ucial in search for Majorana fermions as it is theoretically predicted tha
 t in presence of an in-plane magnetic field\, the Majorana zero mode can b
 e realized utilizing the coupling of an $s$-wave superconductor with a mat
 erial exhibiting Rashba states. Further\, AC magnetic susceptibility and $
 \\mu$SR measurements under hydrostatic pressure manifest a continuous supp
 ression of $T_c$ with increasing pressure. We observed a considerable decr
 ease of superfluid density by ~20% upon application of external pressure. 
 Remarkably\, the superfluid density follows a linear relation with $T_c$ w
 hich was found before in some unconventional topological superconductors a
 nd hole doped cuprates. This finding indicates a possible crossover from B
 ose-Einstein to Bardeen-Cooper-Schrieffer like condensation in $\\alpha$-P
 dBi$_2$.\n\nReference\nDebarchan Das\, R. Gupta\, C. Baines\, H. Luetkens\
 , D. Kaczorowski\, Z. Guguchia\, and R. Khasanov\, Phys. Rev. Lett. 127\, 
 217002 (2022).\n\nhttps://indico.stfc.ac.uk/event/53/contributions/3650/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3650/
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