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SUMMARY:Superconductivity in TiSe$_2$ Under Hydrostatic Pressure
DTSTART;VALUE=DATE-TIME:20220830T164000Z
DTEND;VALUE=DATE-TIME:20220830T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T121056Z
UID:indico-contribution-3773@indico.stfc.ac.uk
DESCRIPTION:Speakers: Frank Elson (KTH\, Royal Institute of Technology)\nO
 ne of the key challenges in the condensed matter research field is underst
 anding the pairing mechanisms that give rise to unconventional superconduc
 tivity. Transition metal dichalcogenides $MX_2$ ($M$ = Nb\, Ti\, Ta\, Mo a
 nd $X$ = S\, Se) are a class of materials that have been shown to exhibit 
 competition between a charge density wave (CDW) and superconducting state 
 [ 1]. In ambient conditions\, TiSe$_2$ displays a CDW state in ambient con
 ditions and has also been shown to undergo a superconducting transition wh
 en intercalated with Cu [2] and when hydrostatic pressure is applied [3]. 
 Here\, we have conducted a muon spin resonance (µ+SR) experiment on a pow
 der sample of TiSe$_2$ under hydrostatic pressure. The measurements were c
 onducted at the GPD beamline\, Paul Scherrer Institute. Measurements were 
 taken at high pressure (22.9 kbar) and at zero pressure in order to compar
 e\, and at two muon momentums of 100 MeV/c and 95 MeV/c. All these measure
 ments were taken in field cooled conditions under 100 Gauss. We can say th
 at the response from the lower momentum muons is mainly from the pressure 
 cell\, and the larger momentum muons respond more to the sample. We see a 
 possible two s-wave gap behaviour for the high-pressure results\, fixing T
 $_C$ = 1.8K\, Δ$_1$ = 1.03meV and Δ$_2$ = 0.096 meV where Δ is the maxi
 mum value of the gap for each contribution. Results from other µ+SR studi
 es using copper doped TiSe$_2$ show a similar behaviour [4]\, suggesting t
 hese mechanisms are similar. Further analysis on these results shall allow
  us to put this material on an Uemura plot.\n[ 1]J.Wilson\,et al\, Adv.In 
 Phys.24.2\,117(1975)\n[2]A.D.Hillier et al\, Phys.Rev.B 81\, p.092507 (201
 0)\n[3]Kusmartseva\, et al. Phys.Rev letters\, 103(23)\, p.236401 (2009)\n
 [4]M.Zaberchik et al. Phys.Rev.B 81\, p.220505(R) (2010)\n\n![Temperature 
 dependence of the relaxation rate from TiSe$_2$ under pressure.][1]\n\n\n 
  [1]: https://drive.google.com/uc?id=1DuoyTM0tYiMOYPqhl-HMw1jF_WwAq5Bu\n\n
 https://indico.stfc.ac.uk/event/53/contributions/3773/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3773/
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