Competing charge density waves and temperature-dependent nesting in 2H-TaSe2

Ph. Leininger, D. Chernyshov, A. Bosak, H. Berger, and D. S. Inosov
Phys. Rev. B 83, 233101 – Published 2 June 2011
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Abstract

Multiple charge density wave (CDW) phases in 2H-TaSe2 are investigated by high-resolution synchrotron x-ray diffraction. In a narrow temperature range immediately above the commensurate CDW transition, we observe a multi-q superstructure with coexisting commensurate and incommensurate order parameters, clearly distinct from the fully incommensurate state at higher temperatures. This multi-q ordered phase, characterized by a temperature hysteresis, is found both during warming and cooling, in contrast to previous reports. In the normal state, the incommensurate superstructure reflection gives way to a broad diffuse peak that persists nearly up to room temperature. Its position provides a direct and accurate estimate of the Fermi surface nesting vector, which evolves nonmonotonically and starts approaching the commensurate position as the temperature is increased. This behavior agrees with our recent observations of the temperature-dependent Fermi surface in the same compound [D. S. Inosov, D. V. Evtushinsky, V. B. Zabolotnyy, A. A. Kordyuk, B. Büchner, R. Follath, H. Berger, and S. V. Borisenko, Phys. Rev. B 79, 125112 (2009).].

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  • Received 18 January 2011

DOI:https://doi.org/10.1103/PhysRevB.83.233101

©2011 American Physical Society

Authors & Affiliations

Ph. Leininger1,*, D. Chernyshov2, A. Bosak3, H. Berger4, and D. S. Inosov1,†

  • 1Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany.
  • 2Swiss-Norwegian Beam Lines, European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble Cedex, France.
  • 3European Synchrotron Radiation Facility (ESRF), 6 rue Jules Horowitz, BP 220, F-38043 Grenoble Cedex, France.
  • 4Institut de Physique de la Matière Complexe, EPFL, 1015 Lausanne, Switzerland.

  • *p.leininger@fkf.mpg.de
  • d.inosov@fkf.mpg.de

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Issue

Vol. 83, Iss. 23 — 15 June 2011

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