Lattice and magnetic instabilities in Cu3Bi(SeO3)2O2X (X=Br,Cl)

V. Gnezdilov, Yu. Pashkevich, P. Lemmens, V. Kurnosov, P. Berdonosov, V. Dolgikh, E. Kuznetsova, V. Pryadun, K. Zakharov, and A. Vasiliev
Phys. Rev. B 96, 115144 – Published 21 September 2017
PDFHTMLExport Citation

Abstract

Specific heat C, thermal conductivity κ, dielectric permittivity ε, electric polarization P, and Raman scattering experiments are performed on Cu3Bi(SeO3)2O2X (X=Br,Cl) single crystals. The Cl compound undergoes a structural phase transition at T*115K evident in C(T), ɛ(T), and κ(T) and accompanied by the appearance of unique phonon lines in Raman scattering. No evident structural changes are detected in the Br compound. At T<T*, a very weak polarization loop with a Pc axis is observed in the Cl compound. Both compounds order antiferromagnetically at comparable temperatures TN25K marked by sharp λ-type singularities. For T<TN, an intensive mode of magnetic origin appears in both compounds. At the lowest temperatures, the energy of this mode is in good agreement with both the magnon excitation observed in infrared spectroscopy and the spin gap found recently in inelastic neutron scattering of the Cl compound.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 17 April 2016
  • Revised 24 July 2017

DOI:https://doi.org/10.1103/PhysRevB.96.115144

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

V. Gnezdilov1,2, Yu. Pashkevich3, P. Lemmens1, V. Kurnosov2, P. Berdonosov4, V. Dolgikh4, E. Kuznetsova4, V. Pryadun4, K. Zakharov4, and A. Vasiliev4,5,6

  • 1Institute of Condensed Matter Physics, TU Braunschweig, D-38106 Braunschweig, Germany
  • 2Institute for Low Temperature Physics and Engineering NASU, 61103 Kharkov, Ukraine
  • 3Donetsk Institute for Physics and Engineering NASU, 03680 Kiev, Ukraine
  • 4Lomonosov Moscow State University, 119991 Moscow, Russia
  • 5National University of Science and Technology “MISiS”, 119049 Moscow, Russia
  • 6National Research South Ural State University, 454080 Chelyabinsk, Russia

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 96, Iss. 11 — 15 September 2017

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×