Superconductivity and hybrid soft modes in TiSe2

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-resolutio...

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Published in:Physical review. B 2016-12, Vol.94 (21)
Main Authors: 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, F
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Language:English
Subjects:
Charge density waves
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Inelastic scattering
Intercalation
Lattice vibration
Phase diagrams
Superconductivity
Transition metal compounds
X-ray scattering
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container_issue 21
container_start_page
container_title Physical review. B
container_volume 94
creator 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, F
description 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 CuxTiSe2 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. These results indicate that 1T−TiSe2 under pressure is close to the elusive state of the excitonic insulator.
doi_str_mv 10.1103/PhysRevB.94.214507
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subjects Charge density waves
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Inelastic scattering
Intercalation
Lattice vibration
Phase diagrams
Superconductivity
Transition metal compounds
X-ray scattering
title Superconductivity and hybrid soft modes in TiSe2
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