Inhomogeneous magnetism in the doped kagome lattice of LaCuO2.66

M.-H. Julien, V. Simonet, B. Canals, R. Ballou, A. K. Hassan, M. Affronte, V. O. Garlea, C. Darie, and P. Bordet
Phys. Rev. B 87, 214423 – Published 24 June 2013

Abstract

The hole-doped kagome lattice of Cu2+ ions in LaCuO2.66 was investigated by nuclear quadrupole resonance, electron spin resonance, electrical resistivity, bulk magnetization, and specific-heat measurements. For temperatures above 180 K, the spin and charge properties show an activated behavior suggestive of a narrow-gap semiconductor. At lower temperatures, the results indicate an insulating ground state which may or may not be charge ordered. While the frustrated spins in remaining patches of the original kagome lattice might not be directly detected here, the observation of coexisting nonmagnetic sites, free spins, and frozen moments reveals an intrinsically inhomogeneous magnetism. Numerical simulations of a 13-diluted kagome lattice rationalize this magnetic state in terms of a heterogeneous distribution of cluster sizes and morphologies near the site-percolation threshold.

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  • Received 15 October 2012

DOI:https://doi.org/10.1103/PhysRevB.87.214423

©2013 American Physical Society

Authors & Affiliations

M.-H. Julien1,*, V. Simonet2,†, B. Canals2, R. Ballou2, A. K. Hassan1, M. Affronte3, V. O. Garlea2,4, C. Darie2, and P. Bordet2

  • 1Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 38042 Grenoble Cedex 9, France
  • 2Institut Néel, CNRS & Université Joseph Fourier, BP166, F-38042 Grenoble Cedex 9, France
  • 3CNR NANO S3 and Dipartimento di Fisica, Università di Modena e Reggio Emilia, via G. Campi 213A 41125, Modena, Italy
  • 4Oak Ridge National Laboratory, 1 Bethel Valley Road, PO Box 2008, Oak Ridge, Tennessee 37831, USA

  • *marc-henri.julien@lncmi.cnrs.fr
  • virginie.simonet@grenoble.cnrs.fr

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Issue

Vol. 87, Iss. 21 — 1 June 2013

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