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Title: Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe2

Journal Article · · Nature Communications
 [1];  [2];  [1];  [1];  [3];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [4];  [5]; ORCiD logo [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics & Astronomy
  2. Ecole Polytechnique, Palaiseau (France). Laboratoire des Solides Irradiés
  3. Ames Lab., Ames, IA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division
  5. Univ. of Florida, Gainesville, FL (United States). Dept. of Physics

The interplay between superconductivity and charge-density wave (CDW) in 2H-NbSe2 is not fully understood despite decades of study. Artificially introduced disorder can tip the delicate balance between two competing long-range orders, and reveal the underlying interactions that give rise to them. Here in this paper we introduce disorder by electron irradiation and measure in-plane resistivity, Hall resistivity, X-ray scattering, and London penetration depth. With increasing disorder, the superconducting transition temperature, Tc, varies non-monotonically, whereas the CDW transition temperature, TCDW, monotonically decreases and becomes unresolvable above a critical irradiation dose where Tc drops sharply. Our results imply that the CDW order initially competes with superconductivity, but eventually assists it. We argue that at the transition where the long-range CDW order disappears, the cooperation with superconductivity is dramatically suppressed. X-ray scattering and Hall resistivity measurements reveal that the short-range CDW survives above the transition. Superconductivity persists to much higher dose levels, consistent with fully gapped superconductivity and moderate interband pairing.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; DMR-1407502
OSTI ID:
1464471
Report Number(s):
IS-J-9685; PII: 5153
Journal Information:
Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 70 works
Citation information provided by
Web of Science

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Evidence for a connection between charge density waves and the pressure enhancement of superconductivity in 2H-NbSe2 journal January 1976
Heat capacity of 2HNbSe2 at the charge density wave transition journal August 1975
Nb–Nb Interactions Define the Charge Density Wave Structure of 2H-NbSe 2 journal January 2013
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Emergence of coherence in the charge-density wave state of 2H-NbSe2 journal February 2015
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Quenched disorder and vestigial nematicity in the pseudogap regime of the cuprates journal May 2014
A calculation of the electronic response function in 2H-NbSe 2 including electron-phonon matrix element effects journal December 1978
Bonding and phase transitions in transition metal dichalcogenide layer compounds journal January 1980
Charge- and spin-density-wave superconductors journal March 2001
Using electron irradiation to probe iron-based superconductors journal May 2018
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Fermi Surface Sheet-Dependent Superconductivity in 2H-NbSe2 journal December 2001
Long-Range Incommensurate Charge Fluctuations in (Y,Nd)Ba2Cu3O6+x journal July 2012
Ubiquitous Interplay Between Charge Ordering and High-Temperature Superconductivity in Cuprates journal December 2013
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Collective excitations in 2D atomic layers: Recent perspectives journal January 2020
Disorder raises the critical temperature of a cuprate superconductor journal May 2019
Interplay of lattice distortion and electronic structure in BaBiO 3 journal November 2019
Experimental investigation of the suppressed superconducting gap and double-resonance mode in Ba 1 − x K x Fe 2 As 2 journal December 2019
Unveiling hidden charge density waves in single-layer NbSe 2 by impurities journal November 2018
Glass-induced enhancement of superconducting T c : Pairing via dissipative mediators journal April 2019
Charge density wave and large nonsaturating magnetoresistance in YNiC 2 and LuNiC 2 journal May 2019
Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides journal November 2019
Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides text January 2019
Disorder raises the critical temperature of a cuprate superconductor text January 2018
Glass-induced enhancement of superconducting $T_c$: Pairing via dissipative mediators text January 2019
Disorder raises the critical temperature of a cuprate superconductor text January 2018