Superconductivity and hybrid soft modes in TiSe2

Maschek, M.; Rosenkranz, S.; Hott, R.; Heid, R.; Merz, Michael; Zocco, D. A.; Said, A. H.; Alatas, A.; Karapetrov, G.; Zhu, Shan; van Wezel, Jasper; Weber, Frank

doi:10.1103/PhysRevB.94.214507

Title: Superconductivity and hybrid soft modes in $Ti {Se}_{2}$

Journal Article · Mon Dec 12 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.214507· OSTI ID:1352569

Maschek, M. ^[1]; Rosenkranz, S. ^[2]; Hott, R. ^[1]; Heid, R. ^[1]; Merz, Michael ^[1]; Zocco, D. A. ^[1]; Said, A. H. ^[2]; Alatas, A. ^[2]; Karapetrov, G. ^[3]; Zhu, Shan ^[4]; van Wezel, Jasper ^[4]; Weber, Frank ^[1]

Karlsruhe Institute of Technology, Karlsruhe (Germany)
Argonne National Lab. (ANL), Argonne, IL (United States)
Drexel Univ., Philadelphia, PA (United States)
Univ. of Amsterdam, Amsterdam (The Netherlands)

The interplay between superconductivity and charge-density-wave (CDW) order plays a central role in the layered transition-metal dichalcogenides. 1T-TiSe₂ forms a prime example, featuring superconducting domes on intercalation as well as under applied pressure. Here, we present high energy-resolution inelastic x-ray scattering measurements of the CDW soft phonon mode in intercalated Cu_xTiSe₂ and pressurized 1T-TiSe₂ along with detailed ab-initio calculations for the lattice dynamical properties and phonon-mediated superconductivity. We find that the intercalation-induced superconductivity can be explained by a solely phonon-mediated pairing mechanism, while this is not possible for the superconducting phase under pressure. We argue that a hybridization of phonon and exciton modes in the pairing mechanism is necessary to explain the full observed temperature-pressure-intercalation phase diagram. Finally, these results indicate that 1T-TiSe₂ under pressure is close to the elusive state of the excitonic insulator.

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

Sponsoring Organization:: Materials Sciences and Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1352569

Alternate ID(s):: OSTI ID: 1335193

Journal Information:: Physical Review B, Vol. 94, Issue 21; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Spectroscopic fingerprints of many-body renormalization in $1 T − {TiSe}_{2}$ Zhao, J.; Lee, Kyungmin; Li, J. Physical Review B, Vol. 100, Issue 4 https://doi.org/10.1103/physrevb.100.045106	journal	July 2019
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