Magnetic and electronic structure of the frustrated spin-chain compound linarite PbCuSO4(OH)2

M. Schäpers, H. Rosner, S.-L. Drechsler, S. Süllow, R. Vogel, B. Büchner, and A. U. B. Wolter
Phys. Rev. B 90, 224417 – Published 17 December 2014

Abstract

We present an extensive microscopic magnetic study of the quasi-one-dimensional frustrated s=12 spin-chain compound linarite. Angular-dependent susceptibility and H1-NMR measurements were performed at various temperatures in the paramagnetic state. All relevant NMR parameters, viz., the chemical, the dipolar, and the Fermi-contact contribution, were extracted to analytically calculate the local magnetic fields at the H1 sites. From this analysis, a significant spin transfer of 11% from the magnetic copper ions onto the two oxygen ligands was derived. This result is compared to LSDA+U calculations, which further can explain the significant reduction of the coupling constants of the compound compared to other edge-sharing CuO chains due to the presence of specific OH bonds in linarite. The magnetically ordered spin-spiral ground state for T<2.8 K was investigated by H1-NMR for fields μ0H=2.0 T along the three crystallographic main directions. With the derived NMR parameters in the paramagnetic regime it is possible to model the NMR spectrum of the magnetically ordered state for Hc. A deviation observed between the NMR data and the evaluated spectrum for Hb is discussed in terms of a significant rearrangement of the spiral state in an applied field of μ0H=2.0 T for this direction.

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  • Received 18 July 2014
  • Revised 13 November 2014

DOI:https://doi.org/10.1103/PhysRevB.90.224417

©2014 American Physical Society

Authors & Affiliations

M. Schäpers1,*, H. Rosner2, S.-L. Drechsler1, S. Süllow3, R. Vogel1, B. Büchner1,4, and A. U. B. Wolter1

  • 1Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
  • 2Max Planck Institute for Chemical Physics of Solids, D-01171 Dresden, Germany
  • 3Institute for Physics of Condensed Matter, TU Braunschweig, D-38106 Braunschweig, Germany
  • 4Institut für Festkörperphysik, TU Dresden, D-01069 Dresden, Germany

  • *Corresponding author: m.schaepers@gmail.com

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Vol. 90, Iss. 22 — 1 December 2014

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