Possible transport evidence for three-dimensional topological superconductivity in doped β-PdBi2

Abstract Interest in topological states of matter burgeoned over a decade ago with the theoretical prediction and experimental detection of topological insulators, especially in bulk three-dimensional insulators that can be tuned out of it by doping. Their superconducting counterpart, the fully-gapp...

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Autores principales:	Ayo Kolapo, Tingxin Li, Pavan Hosur, John H. Miller
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c49eac7be7124f4fb5029244efc5c82f
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spelling	oai:doaj.org-article:c49eac7be7124f4fb5029244efc5c82f2021-12-02T15:09:52ZPossible transport evidence for three-dimensional topological superconductivity in doped β-PdBi210.1038/s41598-019-48906-72045-2322https://doaj.org/article/c49eac7be7124f4fb5029244efc5c82f2019-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-48906-7https://doaj.org/toc/2045-2322Abstract Interest in topological states of matter burgeoned over a decade ago with the theoretical prediction and experimental detection of topological insulators, especially in bulk three-dimensional insulators that can be tuned out of it by doping. Their superconducting counterpart, the fully-gapped three-dimensional time-reversal-invariant topological superconductors, have evaded discovery in bulk intrinsic superconductors so far. The recently discovered topological metal β-PdBi2 is a unique candidate for tunable bulk topological superconductivity because of its intrinsic superconductivity and spin-orbit-coupling. In this work, we provide experimental transport signatures consistent with fully-gapped 3D time-reversal-invariant topological superconductivity in K-doped β-PdBi2. In particular, we find signatures of odd-parity bulk superconductivity via upper-critical field and magnetization measurements— odd-parity pairing can be argued, given the band structure of β-PdBi2, to result in 3D topological superconductivity. In addition, Andreev spectroscopy reveals surface states protected by time-reversal symmetry which might be possible evidence of Majorana surface states (Majorana cone). Moreover, we find that the undoped bulk system is a trivial superconductor. Thus, we discover β-PdBi2 as a unique bulk material that, on doping, can potentially undergo an unprecedented topological quantum phase transition in the superconducting state.Ayo KolapoTingxin LiPavan HosurJohn H. MillerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-10 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ayo Kolapo Tingxin Li Pavan Hosur John H. Miller Possible transport evidence for three-dimensional topological superconductivity in doped β-PdBi2
description	Abstract Interest in topological states of matter burgeoned over a decade ago with the theoretical prediction and experimental detection of topological insulators, especially in bulk three-dimensional insulators that can be tuned out of it by doping. Their superconducting counterpart, the fully-gapped three-dimensional time-reversal-invariant topological superconductors, have evaded discovery in bulk intrinsic superconductors so far. The recently discovered topological metal β-PdBi2 is a unique candidate for tunable bulk topological superconductivity because of its intrinsic superconductivity and spin-orbit-coupling. In this work, we provide experimental transport signatures consistent with fully-gapped 3D time-reversal-invariant topological superconductivity in K-doped β-PdBi2. In particular, we find signatures of odd-parity bulk superconductivity via upper-critical field and magnetization measurements— odd-parity pairing can be argued, given the band structure of β-PdBi2, to result in 3D topological superconductivity. In addition, Andreev spectroscopy reveals surface states protected by time-reversal symmetry which might be possible evidence of Majorana surface states (Majorana cone). Moreover, we find that the undoped bulk system is a trivial superconductor. Thus, we discover β-PdBi2 as a unique bulk material that, on doping, can potentially undergo an unprecedented topological quantum phase transition in the superconducting state.
format	article
author	Ayo Kolapo Tingxin Li Pavan Hosur John H. Miller
author_facet	Ayo Kolapo Tingxin Li Pavan Hosur John H. Miller
author_sort	Ayo Kolapo
title	Possible transport evidence for three-dimensional topological superconductivity in doped β-PdBi2
title_short	Possible transport evidence for three-dimensional topological superconductivity in doped β-PdBi2
title_full	Possible transport evidence for three-dimensional topological superconductivity in doped β-PdBi2
title_fullStr	Possible transport evidence for three-dimensional topological superconductivity in doped β-PdBi2
title_full_unstemmed	Possible transport evidence for three-dimensional topological superconductivity in doped β-PdBi2
title_sort	possible transport evidence for three-dimensional topological superconductivity in doped β-pdbi2
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/c49eac7be7124f4fb5029244efc5c82f
work_keys_str_mv	AT ayokolapo possibletransportevidenceforthreedimensionaltopologicalsuperconductivityindopedbpdbi2 AT tingxinli possibletransportevidenceforthreedimensionaltopologicalsuperconductivityindopedbpdbi2 AT pavanhosur possibletransportevidenceforthreedimensionaltopologicalsuperconductivityindopedbpdbi2 AT johnhmiller possibletransportevidenceforthreedimensionaltopologicalsuperconductivityindopedbpdbi2
_version_	1718387777428520960

Possible transport evidence for three-dimensional topological superconductivity in doped β-PdBi2

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