Electronic structure and superconductivity of the non-centrosymmetric Sn4As3

Carolina A. Marques, M. J. Neat, Chi M. Yim, M. D. Watson, Christoph Heil, K. S. Pervakov, V. A. Vlasenko, V. M. Pudalov, A. V. Muratov, T. K. Kim, Peter Wahl

Publikation: Beitrag in einer FachzeitschriftArtikelForschung

Abstract

In a superconductor that lacks inversion symmetry, the spatial part of the Cooper pair wave function has a reduced symmetry, allowing for the mixing of spin-singlet and spin-triplet Cooper pairing channels and thus providing a pathway to a non-trivial superconducting state. Materials with a non-centrosymmetric crystal structure and with strong spin-orbit coupling are a platform to realize these possibilities. Here, we report the synthesis and characterisation of high quality crystals of Sn4As3, with non-centrosymmetric unit cell (R3m). We have characterised the normal and superconducting state using a range of methods. Angle-resolved photoemission spectroscopy shows a multiband Fermi surface and the presence of two surface states, confirmed by Density-functional theory calculations. Specific heat measurements reveal a superconducting critical temperature of Tc∼1.14 K and an upper critical magnetic field of Hc≳7 mT, which are both confirmed by ultra-low temperature scanning tunneling microscopy and spectroscopy. Scanning tunneling spectroscopy shows a fully formed superconducting gap, consistent with conventional s-wave superconductivity.
Originalspracheenglisch
Aufsatznummer1912.06625
FachzeitschriftarXiv.org e-Print archive
Jahrgang1912
Ausgabenummer06625
PublikationsstatusEingereicht - Dez 2019

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superconductivity
electronic structure
spectroscopy
symmetry
cryogenic temperature
Fermi surfaces
scanning tunneling microscopy
critical temperature
photoelectric emission
heat measurement
platforms
specific heat
wave functions
inversions
density functional theory
orbits
crystal structure
scanning
synthesis
cells

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Marques, C. A., Neat, M. J., Yim, C. M., Watson, M. D., Heil, C., Pervakov, K. S., ... Wahl, P. (2019). Electronic structure and superconductivity of the non-centrosymmetric Sn4As3. Manuskript zur Veröffentlichung eingereicht.

Electronic structure and superconductivity of the non-centrosymmetric Sn4As3. / Marques, Carolina A.; Neat, M. J.; Yim, Chi M.; Watson, M. D.; Heil, Christoph; Pervakov, K. S.; Vlasenko, V. A.; Pudalov, V. M.; Muratov, A. V.; Kim, T. K.; Wahl, Peter.

in: arXiv.org e-Print archive, Jahrgang 1912, Nr. 06625, 1912.06625, 12.2019.

Publikation: Beitrag in einer FachzeitschriftArtikelForschung

Marques, CA, Neat, MJ, Yim, CM, Watson, MD, Heil, C, Pervakov, KS, Vlasenko, VA, Pudalov, VM, Muratov, AV, Kim, TK & Wahl, P 2019, 'Electronic structure and superconductivity of the non-centrosymmetric Sn4As3' arXiv.org e-Print archive, Jg. 1912, Nr. 06625, 1912.06625.
Marques CA, Neat MJ, Yim CM, Watson MD, Heil C, Pervakov KS et al. Electronic structure and superconductivity of the non-centrosymmetric Sn4As3. arXiv.org e-Print archive. 2019 Dez;1912(06625). 1912.06625.
Marques, Carolina A. ; Neat, M. J. ; Yim, Chi M. ; Watson, M. D. ; Heil, Christoph ; Pervakov, K. S. ; Vlasenko, V. A. ; Pudalov, V. M. ; Muratov, A. V. ; Kim, T. K. ; Wahl, Peter. / Electronic structure and superconductivity of the non-centrosymmetric Sn4As3. in: arXiv.org e-Print archive. 2019 ; Jahrgang 1912, Nr. 06625.
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abstract = "In a superconductor that lacks inversion symmetry, the spatial part of the Cooper pair wave function has a reduced symmetry, allowing for the mixing of spin-singlet and spin-triplet Cooper pairing channels and thus providing a pathway to a non-trivial superconducting state. Materials with a non-centrosymmetric crystal structure and with strong spin-orbit coupling are a platform to realize these possibilities. Here, we report the synthesis and characterisation of high quality crystals of Sn4As3, with non-centrosymmetric unit cell (R3m). We have characterised the normal and superconducting state using a range of methods. Angle-resolved photoemission spectroscopy shows a multiband Fermi surface and the presence of two surface states, confirmed by Density-functional theory calculations. Specific heat measurements reveal a superconducting critical temperature of Tc∼1.14 K and an upper critical magnetic field of Hc≳7 mT, which are both confirmed by ultra-low temperature scanning tunneling microscopy and spectroscopy. Scanning tunneling spectroscopy shows a fully formed superconducting gap, consistent with conventional s-wave superconductivity.",
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AU - Marques, Carolina A.

AU - Neat, M. J.

AU - Yim, Chi M.

AU - Watson, M. D.

AU - Heil, Christoph

AU - Pervakov, K. S.

AU - Vlasenko, V. A.

AU - Pudalov, V. M.

AU - Muratov, A. V.

AU - Kim, T. K.

AU - Wahl, Peter

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AB - In a superconductor that lacks inversion symmetry, the spatial part of the Cooper pair wave function has a reduced symmetry, allowing for the mixing of spin-singlet and spin-triplet Cooper pairing channels and thus providing a pathway to a non-trivial superconducting state. Materials with a non-centrosymmetric crystal structure and with strong spin-orbit coupling are a platform to realize these possibilities. Here, we report the synthesis and characterisation of high quality crystals of Sn4As3, with non-centrosymmetric unit cell (R3m). We have characterised the normal and superconducting state using a range of methods. Angle-resolved photoemission spectroscopy shows a multiband Fermi surface and the presence of two surface states, confirmed by Density-functional theory calculations. Specific heat measurements reveal a superconducting critical temperature of Tc∼1.14 K and an upper critical magnetic field of Hc≳7 mT, which are both confirmed by ultra-low temperature scanning tunneling microscopy and spectroscopy. Scanning tunneling spectroscopy shows a fully formed superconducting gap, consistent with conventional s-wave superconductivity.

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