Journal article
Superconductivity and hybrid soft modes in TiSe2
Physical review. B, v 94(21)
12 Dec 2016
Abstract
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.
Metrics
Details
- Title
- Superconductivity and hybrid soft modes in TiSe2
- Creators
- M. Maschek - Karlsruhe Institute of TechnologyS. Rosenkranz - Argonne National LaboratoryR. Hott - Karlsruhe Institute of TechnologyR. Heid - Karlsruhe Institute of TechnologyMichael Merz - Karlsruhe Institute of TechnologyD. A. Zocco - Karlsruhe Institute of TechnologyA. H. Said - Argonne National LaboratoryA. Alatas - Argonne National LaboratoryG. Karapetrov - Drexel UniversityShan Zhu - Institute for Theoretical Physics, Institute of Physics, University of Amsterdam, 1090 GL Amsterdam, The NetherlandsJasper van Wezel - Institute for Theoretical Physics, Institute of Physics, University of Amsterdam, 1090 GL Amsterdam, The NetherlandsF. Weber - Karlsruhe Institute of TechnologyArgonne National Lab. (ANL), Argonne, IL (United States)
- Publication Details
- Physical review. B, v 94(21)
- Publisher
- Amer Physical Soc
- Number of pages
- 10
- Grant note
- Karlsruhe Nano-Micro Facility (KNMF) 1408151 / Div Of Electrical, Commun & Cyber Sys; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG) VH-NG-840 / Helmholtz Association DE-AC02-06CH11357 / DOE Office of Science; United States Department of Energy (DOE) VIDI grant - Netherlands Organisation for Scientific Research (NWO); Netherlands Organization for Scientific Research (NWO) ECCS-1408151 / National Science Foundation; National Science Foundation (NSF) US Department of Energy, Office of Science, Materials Science and Engineering Division; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000390247100006
- Scopus ID
- 2-s2.0-85006306475
- Other Identifier
- 991019168587204721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter