Superconducting energy gap of 2H-NbSe2 in phonon spectroscopy

Weber, F.; Rosenkranz, S.; Heid, R.; Said, A. H.

doi:10.1103/PhysRevB.94.140504

Title: Superconducting energy gap of $2 H - NbS e_{2}$ in phonon spectroscopy

Abstract

We present a high-energy-resolution inelastic x-ray scattering data investigation of the charge-density-wave (CDW) soft phonon mode upon entering the superconducting state in 2H–NbSe₂. Measurements were done close to the CDW ordering wave vector qCDW at q=q_CDW + (0,0,l), 0.15 ≤ l ≤ 0.5, for T = 10K (CDW order) and 3.8K (CDW order+superconductivity). We observe changes of the phonon line shape that are characteristic for systems with strong electron-phonon coupling in the presence of a superconducting energy gap 2Δ_c and from which we can demonstrate an l dependence of the superconducting gap. Reversely, our data imply that the CDW energy gap is strongly localized along the c* direction. The confinement of the CDW gap to a very small momentum region explains the rather low competition and easy coexistence of CDW order and superconductivity in 2H–NbSe₂. Furthermore, the energy gained by opening Δ_CDW seems to be too small to be the driving force of the phase transition at T_CDW = 33K, which is better described as an electron-phonon coupling driven structural phase transition.

Authors:

Weber, F. ^[1]; Rosenkranz, S. ^[2]; Heid, R. ^[1]; Said, A. H. ^[2]

Karlsruhe Institute of Technology, Karlsruhe (Germany)
Argonne National Lab. (ANL), Argonne, IL (United States)

Publication Date:: Tue Oct 25 00:00:00 EDT 2016

Research Org.:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Materials Sciences and Engineering Division; Helmholtz Association

OSTI Identifier:: 1352563

Alternate Identifier(s):: OSTI ID: 1329985

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 94; Journal Issue: 14; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Weber, F., Rosenkranz, S., Heid, R., and Said, A. H. Superconducting energy gap of 2H-NbSe2 in phonon spectroscopy.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevB.94.140504.

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                    Weber, F., Rosenkranz, S., Heid, R., & Said, A. H. Superconducting energy gap of 2H-NbSe2 in phonon spectroscopy.  United States.  https://doi.org/10.1103/PhysRevB.94.140504

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                    Weber, F., Rosenkranz, S., Heid, R., and Said, A. H. Tue .  
"Superconducting energy gap of 2H-NbSe2 in phonon spectroscopy".  United States.  https://doi.org/10.1103/PhysRevB.94.140504.  https://www.osti.gov/servlets/purl/1352563.

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@article{osti_1352563,

  title        = {Superconducting energy gap of 2H-NbSe2 in phonon spectroscopy},

  author       = {Weber, F. and Rosenkranz, S. and Heid, R. and Said, A. H.},

  abstractNote = {We present a high-energy-resolution inelastic x-ray scattering data investigation of the charge-density-wave (CDW) soft phonon mode upon entering the superconducting state in 2H–NbSe2. Measurements were done close to the CDW ordering wave vector qCDW at q=qCDW + (0,0,l), 0.15 ≤ l ≤ 0.5, for T = 10K (CDW order) and 3.8K (CDW order+superconductivity). We observe changes of the phonon line shape that are characteristic for systems with strong electron-phonon coupling in the presence of a superconducting energy gap 2Δc and from which we can demonstrate an l dependence of the superconducting gap. Reversely, our data imply that the CDW energy gap is strongly localized along the c* direction. The confinement of the CDW gap to a very small momentum region explains the rather low competition and easy coexistence of CDW order and superconductivity in 2H–NbSe2. Furthermore, the energy gained by opening ΔCDW seems to be too small to be the driving force of the phase transition at TCDW = 33K, which is better described as an electron-phonon coupling driven structural phase transition.},

  doi          = {10.1103/PhysRevB.94.140504},

  journal      = {Physical Review B},

  number       = 14,

  volume       = 94,

  place        = {United States},

  year         = {Tue Oct 25 00:00:00 EDT 2016},

  month        = {Tue Oct 25 00:00:00 EDT 2016}

}

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Works referenced in this record:

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Works referencing / citing this record:

Higgs-mode radiance and charge-density-wave order in $2 H - {NbSe}_{2}$
journal, March 2018

Grasset, Romain; Cea, Tommaso; Gallais, Yann
Physical Review B, Vol. 97, Issue 9
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Electron-phonon coupling and superconductivity-induced distortion of the phonon lineshape in $V_{3} Si$
journal, April 2019

Sauer, A.; Zocco, D. A.; Said, A. H.
Physical Review B, Vol. 99, Issue 13
DOI: 10.1103/physrevb.99.134511

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Title: Superconducting energy gap of 2 H - NbS e 2 in phonon spectroscopy

Abstract

Citation Formats

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Title: Superconducting energy gap of $2 H - NbS e_{2}$ in phonon spectroscopy

Pressure Induced Superconductivity in Pristine $1 T − {TiSe}_{2}$
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Pressure-Induced Superconducting Phase in the Charge-Density-Wave Compound Terbium Tritelluride
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Charge order from orbital-dependent coupling evidenced by NbSe2
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Strong anharmonicity induces quantum melting of charge density wave in $2 H - {NbSe}_{2}$ under pressure
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Evidence for a connection between charge density waves and the pressure enhancement of superconductivity in 2H-NbSe2
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Strongly enhanced charge-density-wave order in monolayer NbSe₂
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Pressure Induced Effects on the Fermi Surface of Superconducting $2 H − {NbSe}_{2}$
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Pressure dependence of the charge-density-wave and superconducting states in ${GdTe}_{3}, {TbTe}_{3}$ , and ${DyTe}_{3}$
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Optical phonons and the soft mode in 2 $H$ -NbSe $_{2}$
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Strong-Coupling Theory of Charge-Density-Wave Transitions
journal, July 1983

From Mott state to superconductivity in 1T-TaS2
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Two Energy Gaps and Fermi-Surface “Arcs” in ${NbSe}_{2}$
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Quantum phase transition from triangular to stripe charge order in NbSe2
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