Weak antilocalization effect and noncentrosymmetric superconductivity in a topologically nontrivial semimetal LuPdBi

Handle URI:
http://hdl.handle.net/10754/334527
Title:
Weak antilocalization effect and noncentrosymmetric superconductivity in a topologically nontrivial semimetal LuPdBi
Authors:
Xu, Guizhou; Wang, Wenhong; Zhang, Xiaoming; Du, Yin; Liu, Enke; Wang, Shouguo; Wu, Guangheng; Liu, Zhongyuan; Zhang, Xixiang ( 0000-0002-3478-6414 )
Abstract:
A large number of half-Heusler compounds have been recently proposed as three-dimensional (3D) topological insulators (TIs) with tunable physical properties. However, no transport measurements associated with the topological surface states have been observed in these half-Heusler candidates due to the dominating contribution from bulk electrical conductance. Here we show that, by reducing the mobility of bulk carriers, a two-dimensional (2D) weak antilocalization (WAL) effect, one of the hallmarks of topological surface states, was experimentally revealed from the tilted magnetic field dependence of magnetoconductance in a topologically nontrivial semimetal LuPdBi. Besides the observation of a 2D WAL effect, a superconducting transition was revealed at T c ∼ 1.7â.K in the same bulk LuPdBi. Quantitative analysis within the framework of a generalized BCS theory leads to the conclusion that the noncentrosymmetric superconductivity of LuPdBi is fully gapped with a possibly unconventional pairing character. The co-existence of superconductivity and the transport signature of topological surface states in the same bulk alloy suggests that LuPdBi represents a very promising candidate as a topological superconductor.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Xu G, Wang W, Zhang X, Du Y, Liu E, et al. (2014) Weak Antilocalization Effect and Noncentrosymmetric Superconductivity in a Topologically Nontrivial Semimetal LuPdBi. Sci Rep 4. doi:10.1038/srep05709.
Publisher:
Nature Publishing Group
Journal:
Scientific Reports
Issue Date:
21-Jul-2014
DOI:
10.1038/srep05709
PubMed ID:
25043549
PubMed Central ID:
PMC4104393
ARXIV:
arXiv:1408.1543
Type:
Article
ISSN:
20452322
Additional Links:
http://arxiv.org/abs/1408.1543
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorXu, Guizhouen
dc.contributor.authorWang, Wenhongen
dc.contributor.authorZhang, Xiaomingen
dc.contributor.authorDu, Yinen
dc.contributor.authorLiu, Enkeen
dc.contributor.authorWang, Shouguoen
dc.contributor.authorWu, Guanghengen
dc.contributor.authorLiu, Zhongyuanen
dc.contributor.authorZhang, Xixiangen
dc.date.accessioned2014-11-11T14:28:28Z-
dc.date.available2014-11-11T14:28:28Z-
dc.date.issued2014-07-21en
dc.identifier.citationXu G, Wang W, Zhang X, Du Y, Liu E, et al. (2014) Weak Antilocalization Effect and Noncentrosymmetric Superconductivity in a Topologically Nontrivial Semimetal LuPdBi. Sci Rep 4. doi:10.1038/srep05709.en
dc.identifier.issn20452322en
dc.identifier.pmid25043549en
dc.identifier.doi10.1038/srep05709en
dc.identifier.urihttp://hdl.handle.net/10754/334527en
dc.description.abstractA large number of half-Heusler compounds have been recently proposed as three-dimensional (3D) topological insulators (TIs) with tunable physical properties. However, no transport measurements associated with the topological surface states have been observed in these half-Heusler candidates due to the dominating contribution from bulk electrical conductance. Here we show that, by reducing the mobility of bulk carriers, a two-dimensional (2D) weak antilocalization (WAL) effect, one of the hallmarks of topological surface states, was experimentally revealed from the tilted magnetic field dependence of magnetoconductance in a topologically nontrivial semimetal LuPdBi. Besides the observation of a 2D WAL effect, a superconducting transition was revealed at T c ∼ 1.7â.K in the same bulk LuPdBi. Quantitative analysis within the framework of a generalized BCS theory leads to the conclusion that the noncentrosymmetric superconductivity of LuPdBi is fully gapped with a possibly unconventional pairing character. The co-existence of superconductivity and the transport signature of topological surface states in the same bulk alloy suggests that LuPdBi represents a very promising candidate as a topological superconductor.en
dc.language.isoenen
dc.publisherNature Publishing Groupen
dc.relation.urlhttp://arxiv.org/abs/1408.1543en
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/en
dc.titleWeak antilocalization effect and noncentrosymmetric superconductivity in a topologically nontrivial semimetal LuPdBien
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalScientific Reportsen
dc.identifier.pmcidPMC4104393en
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionState Key Laboratory for Magnetism, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, Chinaen
dc.contributor.institutionState Key Laboratory of Metastable Material Sciences and Technology, Yanshan University, Qinhuangdao 066004, Chinaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
dc.identifier.arxividarXiv:1408.1543en
kaust.authorZhang, Xixiangen

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