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Journal article
Magnetic and thermodynamic properties of CuxTiSe2 single crystals
Physical review. B, v 95(17), p174512
22 May 2017
Abstract
We present a detailed study of the phase diagram of copper-intercalated TiSe2 single crystals, combining local Hall-probe magnetometry, tunnel diode oscillator technique (TDO), and specific-heat and angle-resolved photoemission spectroscopy measurements. A series of the Cu-x TiSe2 samples from three different sources with various copper content x and superconducting critical temperatures T-c have been investigated. We first show that the vortex penetration mechanism is dominated by geometrical barriers enabling a precise determination of the lower critical field, H-c1. We then show that the temperature dependence of the superfluid density deduced from magnetic measurements (both H-c1 and TDO techniques) clearly suggests the existence of a small energy gap in the system, with a coupling strength 2 Delta(s) similar to [2.4-2.8]k(B)T(c), regardless of the copper content, in puzzling contradiction with specific-heat measurements which can be well described by one single large gap 2 Delta(l) similar to [3.7-3.9]k(B)T(c). Finally, our measurements reveal a nontrivial doping dependence of the condensation energy, which remains to be understood.
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Details
- Title
- Magnetic and thermodynamic properties of CuxTiSe2 single crystals
- Creators
- Z. Pribulova - Institute of Experimental PhysicsZ. Medvecka - Institute of Experimental PhysicsJ. Kacmarcik - Institute of Experimental PhysicsV. Komanicky - Institute of Experimental PhysicsT. Klein - Institut NéelP. Rodiere - Institut NéelF. Levy-Bertrand - Institut NéelB. Michon - Institut NéelC. Marcenat - CEA GrenobleP. Husanikova - Slovak Academy of SciencesV. Cambel - Slovak Academy of SciencesJ. Soltys - Slovak Academy of SciencesG. Karapetrov - Drexel UniversityS. Borisenko - Leibniz Institute for Solid State and Materials ResearchD. Evtushinsky - Helmholtz-Zentrum Berlin für Materialien und EnergieH. Berger - École Polytechnique Fédérale de LausanneP. Samuely - Institute of Experimental Physics
- Publication Details
- Physical review. B, v 95(17), p174512
- Publisher
- Amer Physical Soc
- Number of pages
- 8
- Grant note
- 1408151 / Directorate For Engineering; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG) VEGA-0149/16; VEGA-0409/15 / Slovak Scientific Grant Agency; Vedecka grantova agentura MSVVaS SR a SAV (VEGA) APVV-14-0605 / Slovak Research and Development Agency U.S. Steel Kosice, s.r.o. ITMS26220120005 / EU ERDF (European regional development fund) ANR-12-JS04-0003-01 SUBRISSYME / French National Research Agency; French National Research Agency (ANR)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000401997600005
- Scopus ID
- 2-s2.0-85023192184
- Other Identifier
- 991019169562904721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter