Turning charge-density waves into Cooper pairs

Alla Chikina; Alexander Fedorov; Dilipkumar Bhoi; Vladimir Voroshnin; Erik Haubold; Yevhen Kushnirenko; Kee Hoon Kim; Sergey Borisenko

doi:10.1038/s41535-020-0225-5

Turning charge-density waves into Cooper pairs

Alla Chikina
, Alexander Fedorov
, Dilipkumar Bhoi
, Vladimir Voroshnin
, Erik Haubold
, Yevhen Kushnirenko
, Kee Hoon Kim
, Sergey Borisenko

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

The relationship between charge-density waves (CDWs) and superconductivity is a long-standing debate. Often observed as neighbors in phase diagrams, it is still unclear whether they cooperate, compete, or simply coexist. Using angle-resolved photoemission spectroscopy, we demonstrate here that by tuning the energy position of the van Hove singularity in Pd-doped 2H-TaSe₂, one is able to suppress CDW and enhance superconductivity by more than an order of magnitude. We argue that it is particular fermiology of the material that is responsible for each phenomenon, thus explaining their persistent proximity as phases.

Original language	English
Article number	22
Journal	npj Quantum Materials
Volume	5
Issue number	1
DOIs	https://doi.org/10.1038/s41535-020-0225-5
State	Published - Dec 1 2020
Externally published	Yes

Funding

We are grateful to Sabine Wurmehl for the fruitful discussions. This work is supported by DFG Grant Nos. BO1912/6-1, BO1912/7-1, and SPP1458, and BMBF Grant UKRATOP and VILLUM FONDEN through the Center of Excellence for Dirac Materials (Grant. No. 11744). The works at SNU have been supported by HYU-HPSTAR-CIS High Pressure Research Center (NRF-2016K1A4A3914691) and Korea Institute of Energy Technology Evaluation and Planning (20173010012940).

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AU - Voroshnin, Vladimir

AU - Haubold, Erik

AU - Kushnirenko, Yevhen

AU - Kim, Kee Hoon

AU - Borisenko, Sergey

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Turning charge-density waves into Cooper pairs

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