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SUMMARY:Large non-saturating magnetoresistance in a novel superconductor C
 a3.2Co4Sn12.8 - Dr. Monika Gamza\, University of Central Lancashire
DTSTART:20160224T111500Z
DTEND:20160224T121500Z
UID:TALK61171@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:Stannides with crystal structures composed of rigid covalently
  bonded frameworks forming cages filled with guest atoms exhibit an astoni
 shing diversity of interesting behaviours that are\, moreover\, accessible
  to tuning. Recent reports on unconventional superconducting states and in
 triguing structural and electronic instabilities for compounds with skutte
 rudite-related crystal structures and the stoichiometry M3T4Sn13 (M is a r
 are earth or alkaline earth\; T is a transition metal)[1-4] prompted us to
  study consecutive members of this family. \n\nIn this talk\, I will intro
 duce a novel superconductor Ca3+xCo4Sn13-x (x  0.2) with TC  5.5 K a
 nd a huge low temperature normal state magnetoresistance (MR) of up to 100
 0% in magnetic field of 9 T for crystals grown from Sn flux with the resid
 ual resistivity ratio (RRR) of 64. I will demonstrate that the magnitude o
 f MR scales with the RRR\, MR  1.6(1) RRR1.7(2).  I will present res
 ults of structural\, thermodynamic and transport measurements. With the he
 lp of the experimental data and electronic band structure results I will a
 ddress the origin of the extraordinarily large MR and the role of multiban
 d effects in Ca3.2Co4Sn12.8.\n\nIn the second part of the talk\, I will di
 scuss the ways of tuning the physical properties of the M3T4Sn13 -type sys
 tems in the context\nof their electronic band structure and chemical bondi
 ng characteristics based on examples of {La\,Ce}3Rh4Sn13 and Ca3Co4Sn13.\n
 \n[1] S. K. Goh et al.\, Phys. Rev. Lett. 114\, 097002 (2015) and refere
 nces therein \n[2] A. Ślebarski et al.\, Phys. Rev. B 89\, 125111 (2014) 
 and references therein \n[3] N. Kase\, H. Hayamizu\, and J. Akimitsu\, Phy
 s. Rev. B 83\, 184509 (2011)\n[4] P. D. Kulkarni et al.\, Phys. Rev. B 84\
 , 014501 (2011) and references therein\n
LOCATION:Small Lecture Theatre\, Room 133\, Cavendish Laboratory\, Departm
 ent of Physics
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