Pressure-induced superconductivity in the giant Rashba system BiTeI

At ambient pressure, BiTeI exhibits a giant Rashba splitting of the bulk electronic bands. At low pressures, BiTeI undergoes a transition from trivial insulator to topological insulator. At still higher pressures, two structural transitions are known to occur. We have carried out a series of electrical resistivity and AC magnetic susceptibility measurements on BiTeI at pressure up to similar to 40 GPa in an effort to characterize the properties of the high-pressure phases. A previous calculation found that the high-pressure orthorhombic P4/nmm structure BiTeI is a metal. We find that this structure is superconducting with T-c values as high as 6 K. AC magnetic susceptibility measurements support the bulk nature of the superconductivity. Using electronic structure and phonon calculations, we compute Tc and find that our data is consistent with phonon-mediated superconductivity.


Published in:
Journal Of Physics-Condensed Matter, 29, 9, 09LT02
Year:
2017
Publisher:
Bristol, Iop Publishing Ltd
ISSN:
0953-8984
Keywords:
Laboratories:




 Record created 2017-03-27, last modified 2018-01-28


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