Record-High Superconductivity in Transition Metal Dichalcogenides Emerged in Compressed 2H-TaS2

Record-High Superconductivity in Transition Metal Dichalcogenides Emerged in Compressed 2H-TaS2

© 2022 Wiley-VCH GmbH.

Détails bibliographiques
Publié dans:Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 9 vom: 14. März, Seite e2103168
Auteur principal: Dong, Qing (Auteur)
Autres auteurs: Pan, Jie, Li, Shujia, Fang, Yuqiang, Lin, Tao, Liu, Shuang, Liu, Bo, Li, Quanjun, Huang, Fuqiang, Liu, Bingbing
Format: Article en ligne
Langue:English
Publié: 2022
Accès à la collection:Advanced materials (Deerfield Beach, Fla.)
Sujets:Journal Article high pressure interlayer modification superconducting state transition metal dichalcogenides
Description
Résumé:© 2022 Wiley-VCH GmbH.
Pressure has always been an effective method for uncovering novel phenomena and properties in condensed matter physics. Here, an electrical transport study is carried on 2H-TaS2 up to ≈208 GPa, and an unexpected superconducting state (SC-II) emerging around 86.1 GPa with an initial critical temperature (Tc ) of 9.6 K is found. As pressure increases, the Tc enhances rapidly and reaches a maximum of 16.4 K at 157.4 GPa, which sets a new record for transition metal dichalcogenides (TMDs). The original superconducting state (SC-I) is found to be re-enhanced above 100 GPa after the recession around 10 GPa, and coexists with SC-II to the highest pressure applied in this work. In situ high-pressure X-ray diffraction and Hall effect measurements reveal that the occurrence of SC-II is accompanied by a structural modification and a concurrent enhancement of hole carrier density. The new high-Tc superconducting state in 2H-TaS2 can be attributed to the change of the electronic states near the Fermi surface, owing to pressure-induced interlayer modulation. It is the first time finding this remarkable superconducting state in TMDs, which not only brings a new broad of perspective on layered materials but also expands the field of pressure-modified superconductivity
Description:Date Revised 03.03.2022
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202103168