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Pressure-induced superconductivity in the giant Rashba system BiTeI.

Authors :
VanGennep D
Linscheid A
Jackson DE
Weir ST
Vohra YK
Berger H
Stewart GR
Hennig RG
Hirschfeld PJ
Hamlin JJ
Source :
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2017 Mar 08; Vol. 29 (9), pp. 09LT02. Date of Electronic Publication: 2016 Dec 22.
Publication Year :
2017

Abstract

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  ∼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 <subscript>c</subscript> 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 T <subscript>c</subscript> and find that our data is consistent with phonon-mediated superconductivity.

Details

Language :
English
ISSN :
1361-648X
Volume :
29
Issue :
9
Database :
MEDLINE
Journal :
Journal of physics. Condensed matter : an Institute of Physics journal
Publication Type :
Academic Journal
Accession number :
28004645
Full Text :
https://doi.org/10.1088/1361-648X/aa5567