Magnetic and thermodynamic properties of CuxTiSe2 single crystals

Z. Pribulová, Z. Medvecká, J. Kačmarčík, V. Komanický, T. Klein, P. Rodière, F. Levy-Bertrand, B. Michon, C. Marcenat, P. Husaníková, V. Cambel, J. Šoltýs, G. Karapetrov, S. Borisenko, D. Evtushinsky, H. Berger, and P. Samuely
Phys. Rev. B 95, 174512 – Published 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 CuxTiSe2 samples from three different sources with various copper content x and superconducting critical temperatures Tc 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, Hc1. We then show that the temperature dependence of the superfluid density deduced from magnetic measurements (both Hc1 and TDO techniques) clearly suggests the existence of a small energy gap in the system, with a coupling strength 2Δs[2.42.8]kBTc, regardless of the copper content, in puzzling contradiction with specific-heat measurements which can be well described by one single large gap 2Δl[3.73.9]kBTc. Finally, our measurements reveal a nontrivial doping dependence of the condensation energy, which remains to be understood.

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  • Received 30 January 2017
  • Revised 28 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.174512

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Z. Pribulová1, Z. Medvecká1, J. Kačmarčík1, V. Komanický1, T. Klein2, P. Rodière2, F. Levy-Bertrand2, B. Michon2, C. Marcenat3, P. Husaníková4, V. Cambel4, J. Šoltýs4, G. Karapetrov5, S. Borisenko6, D. Evtushinsky7, H. Berger8, and P. Samuely1

  • 1Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences, and P. J. Šafárik University, SK-04001 Košice, Slovakia
  • 2Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France
  • 3SPSMS, UMR-E9001, CEA-INAC/UJF-Grenoble 1, 17 Rue des martyrs, 38054 Grenoble, France
  • 4Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia
  • 5Department of Physics, Drexel University, 3141 Chestnut St., Philadelphia, Pennsylvania 19104, USA
  • 6IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany
  • 7Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
  • 8Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

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Issue

Vol. 95, Iss. 17 — 1 May 2017

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