Search for magnetic order in superconducting RuSr2Eu1.2Ce0.8Cu2O10

J. W. Lynn, Y. Chen, Q. Huang, S. K. Goh, and G. V. M. Williams
Phys. Rev. B 76, 014519 – Published 24 July 2007

Abstract

Neutron diffraction, polarized neutron transmission, and small angle neutron scattering have been used to investigate the crystal structure and nature of the magnetic order in a polycrystalline sample of RuSr2Eu1.2Ce0.8Cu2O10. The sample was made with the Eu-153 (98.8%) isotope to reduce the high neutron absorption for the naturally occurring element. Full refinements of the crystal structure, space group I4mmm, are reported. At low temperatures only a single magnetic peak is clearly observed in a relatively wide angular range. A sharp spin reorientation transition (SRT) is observed around 35K, close to the superconducting transition temperature (Tc40K). Between the spin reorientation temperature and the Neel temperature of 59K, additional magnetic reflections are observed. However, none of these can be simply indexed on the chemical unit cell, either as commensurate peaks or simple incommensurate magnetism, and the paucity of reflections at low T compels the conclusion that these magnetic Bragg peaks arise from an impurity phase. X-ray and neutron diffraction on the pressed pellet both show that the sample does not appear to contain substantial impurity phases, but it turns out that the magnetic impurity peaks exhibit strong preferred orientation with respect to the pellet orientation, while the primary phase does not. We have been unable to observe any magnetic order that can be identified with the ruthenate-cuprate system.

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  • Received 13 December 2006

DOI:https://doi.org/10.1103/PhysRevB.76.014519

©2007 American Physical Society

Authors & Affiliations

J. W. Lynn1, Y. Chen1,2, Q. Huang1, S. K. Goh3, and G. V. M. Williams3

  • 1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 2Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
  • 3MacDiarmid Institute for Advanced Materials and Nanotechnology, Industrial Research, P.O. Box 31310, Lower Hutt, New Zealand

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Vol. 76, Iss. 1 — 1 July 2007

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