Singlet state formation and its impact on the magnetic structure in the tetramer system SeCuO3

Tonči Cvitanić, Vinko Šurija, Krunoslav Prša, Oksana Zaharko, Ivan Kupčić, Peter Babkevich, Matthias Frontzek, Miroslav Požek, Helmuth Berger, Arnaud Magrez, Henrik M. Rønnow, Mihael S. Grbić, and Ivica Živković
Phys. Rev. B 98, 054409 – Published 9 August 2018

Abstract

We present an experimental investigation of the magnetic structure in a tetramer system SeCuO3 using neutron powder-diffraction and nuclear resonance techniques. We establish a commensurate antiferromagnetic ordering with a propagation vector k=(0,0,1). The order parameter follows a critical behavior near TN=8K with a critical exponent β=0.32 in agreement with a three-dimensional universality class. Evidence is presented that a singlet state starts to form on tetramers at temperatures as high as 200 K, and its signature is preserved within the ordered state through a strong renormalization of the ordered magnetic moment on two nonequivalent copper sites mCu10.35μB and mCu2<0.8μB at 1.5 K.

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  • Received 11 January 2018
  • Revised 26 June 2018

DOI:https://doi.org/10.1103/PhysRevB.98.054409

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Tonči Cvitanić1, Vinko Šurija2, Krunoslav Prša3, Oksana Zaharko4, Ivan Kupčić1, Peter Babkevich3, Matthias Frontzek4,5, Miroslav Požek1, Helmuth Berger3, Arnaud Magrez3, Henrik M. Rønnow3, Mihael S. Grbić1,*, and Ivica Živković2,3,†

  • 1Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
  • 2Institute of Physics, Bijenička 46, HR-10000 Zagreb, Croatia
  • 3Institute of Physics, EPFL, CH-1015 Lausanne, Switzerland
  • 4Laboratory for Neutron Scattering and Imaging, PSI, CH-5232 Villigen, Switzerland
  • 5Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *mgrbic@phy.hr
  • ivica.zivkovic@epfl.ch

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Issue

Vol. 98, Iss. 5 — 1 August 2018

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