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Absence of superconducting dome at the charge-density-wave quantum phase transition in 2 H − NbSe 2

Moulding, Owen, Osmond, Israel, Flicker, Felix, Muramatsu, Takaki and Friedemann, Sven 2020. Absence of superconducting dome at the charge-density-wave quantum phase transition in 2 H − NbSe 2. Physical Review Research 2 (4) , 043392. 10.1103/PhysRevResearch.2.043392

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Abstract

Superconductivity is often found in a dome around quantum critical points, i.e., second-order quantum phase transitions. Here, we show that an enhancement of superconductivity is avoided at the critical pressure of the charge-density-wave (CDW) state in 2 H − NbSe 2 . We present comprehensive high-pressure Hall effect and magnetic susceptibility measurements of the CDW and superconducting state in 2 H − NbSe 2 . Initially, the second-order CDW transition is suppressed smoothly but it drops to zero abruptly at P CDW = 4.4 GPa thus indicating a change to first order, while the superconducting transition temperature T c rises continuously up to P CDW but is constant above. The putative first-order nature of the CDW transition is suggested as the cause for the absence of a superconducting dome at P CDW . Indeed, we show that the suppression of the superconducting state at low pressures is due to the loss of density of states inside the CDW phase, while the initial suppression of the CDW state is accounted for by the stiffening of the underlying bare phonon mode.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Additional Information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license
Publisher: American Physical Society
ISSN: 2643-1564
Date of First Compliant Deposit: 17 February 2021
Date of Acceptance: 25 November 2020
Last Modified: 18 Feb 2021 10:00
URI: http://orca.cardiff.ac.uk/id/eprint/138618

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