Hindered magnetic order from mixed dimensionalities in CuP2O6

R. Nath, K. M. Ranjith, J. Sichelschmidt, M. Baenitz, Y. Skourski, F. Alet, I. Rousochatzakis, and A. A. Tsirlin
Phys. Rev. B 89, 014407 – Published 8 January 2014

Abstract

We present a combined experimental and theoretical study of the spin-12 compound CuP2O6 that features a network of two-dimensional (2D) antiferromagnetic (AFM) square planes, interconnected via one-dimensional (1D) AFM spin chains. Magnetic susceptibility, high-field magnetization, and electron spin resonance (ESR) data, as well as microscopic density-functional band-structure calculations and subsequent quantum Monte Carlo simulations, show that the coupling J2D40 K in the layers is an order of magnitude larger than J1D3 K in the chains. Below TN8 K, CuP2O6 develops long-range order, as evidenced by a weak net moment on the 2D planes induced by anisotropic magnetic interactions of Dzyaloshinsky-Moriya type. A striking feature of this 3D ordering transition is that the 1D moments grow significantly slower than the ones on the 2D units, which is evidenced by the persistent paramagnetic ESR signal below TN. Compared to typical quasi-2D magnets, the ordering temperature of CuP2O6 TN/J2D0.2 is unusually low, showing that weakly coupled spins sandwiched between 2D magnetic units effectively decouple these units and impede the long-range ordering.

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  • Received 30 October 2013

DOI:https://doi.org/10.1103/PhysRevB.89.014407

©2014 American Physical Society

Authors & Affiliations

R. Nath1,*, K. M. Ranjith1, J. Sichelschmidt2, M. Baenitz2, Y. Skourski3, F. Alet4, I. Rousochatzakis5,†, and A. A. Tsirlin2,6,‡

  • 1School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, India
  • 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
  • 3Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
  • 4Laboratoire de Physique Théorique, Université de Toulouse and CNRS, UPS (IRSAMC), 31062 Toulouse, France
  • 5Institute for Theoretical Solid State Physics, IFW Dresden, 01171 Dresden, Germany
  • 6National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia

  • *rnath@iisertvm.ac.in
  • i.rousochatzakis@ifw-dresden.de
  • altsirlin@gmail.com

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Issue

Vol. 89, Iss. 1 — 1 January 2014

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