| Title: |
Lifshitz-enhanced superfluid density in two-gap superconducting TiSe2 |
| Authors: |
Elson, F.; Philippe, J.; Simutis, G.; Forslund, Ola K.; Abdel-Hafiez, M.; Janoschek, M.; Khasanov, R.; Das, D.; Weissenrieder, J.; Tam, D. W.; Sassa, Y.; Månsson, M. |
| Publisher Information: |
Uppsala universitet, Materialteori; KTH Royal Inst Technol, Dept Appl Phys, SE-10691 Stockholm, Sweden.; PSI Ctr Neutron & Muon Sci CNM, CH-5232 Villigen, Switzerland.;Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.; PSI Ctr Neutron & Muon Sci CNM, CH-5232 Villigen, Switzerland.;Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.; Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.; Univ Sharjah, Dept Appl Phys & Astron, POB 27272, Sharjah, U Arab Emirates.; PSI Ctr Neutron & Muon Sci CNM, CH-5232 Villigen, Switzerland. |
| Publication Year: |
2025 |
| Collection: |
Uppsala University: Publications (DiVA) |
| Subject Terms: |
Condensed Matter Physics; Den kondenserade materiens fysik |
| Description: |
Superconductivity in TiSe2 emerges when the charge density wave (CDW) order is suppressed under pressure or doping. Recent theoretical and experimental studies suggest that a Lifshitz transition plays a key role in stabilizing the superconducting phase. Here, we present muon spin resonance measurements of pressurized TiSe2, revealing a two-gap superconducting state. Our results indicate that the smaller gap contributes unexpectedly strongly to the total superfluid density. This effect is consistent with an enhanced density of states in a newly formed Fermi surface pocket at the Lifshitz transition. These findings provide microscopic insight into the interplay between CDW suppression, Fermi surface reconstruction, and multi-gap superconductivity in TiSe2, demonstrating how pressure-induced changes in electronic structure can shape superconducting properties in layered materials. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| ISBN: |
978-0-01-659708-4; 0-01-659708-7 |
| Relation: |
2025, 11; NPJ QUANTUM MATERIALS, 2397-4648, 2025, 11; ISI:001659708700001 |
| DOI: |
10.1038/s41535-025-00834-8 |
| Availability: |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-577396; https://doi.org/10.1038/s41535-025-00834-8 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.523BEBC |
| Database: |
BASE |