Interplay of charge density waves, disorder, and superconductivity in 2H-TaSe2 elucidated by NMR

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

Single crystals of pristine and 6% Pd-intercalated 2H-TaSe2 have been studied by means of 77Se nuclear magnetic resonance. The temperature dependence of the 77Se spectrum, with an unexpected line narrowing upon Pd intercalation, unravels the presence of correlated local lattice distortions far above the transition temperature of the charge density wave (CDW) order, thereby supporting a strong-coupling CDW mechanism in 2H-TaSe2. While, the Knight shift data suggest that the incommensurate CDW transition involves a partial Fermi surface gap opening. As for spin dynamics, the 77Se spin-lattice relaxation rate T1-1 as a function of temperature shows that a pseudogap behavior dominates the low-energy spin excitations even within the CDW phase, and gets stronger along with superconductivity in the Pd-6% sample. We discuss that CDW fluctuations may be responsible for the pseudogap as well as superconductivity, although the two phenomena are unlikely to be directly linked each other.

Details

Original languageEnglish
Article number043008
Number of pages7
JournalNew Journal of Physics
Volume24
Issue number4
Publication statusPublished - 1 Apr 2022
Peer-reviewedYes

External IDs

Scopus 85129121869
WOS 000778392400001
Mendeley 033a1680-7603-3fa6-919e-a804c95fc088

Keywords

ASJC Scopus subject areas

Keywords

  • Charge density wave, Nuclear magnetic resonance, Superconductivity, Transition metal dichacogenide

Library keywords