Microscopic changes in HoNi2B2C due to thermal treatment and its effect on superconductivity

A. Dertinger, R. E. Dinnebier, A. Kreyssig, P. W. Stephens, S. Pagola, M. Loewenhaupt, S. van Smaalen, and H. F. Braun
Phys. Rev. B 63, 184518 – Published 23 April 2001
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Abstract

The low-temperature properties of HoNi2B2C strongly depend on its thermodynamic state established via thermal treatment. We present high resolution x-ray powder diffraction data taken on a pair of polycrystalline samples with identical chemical composition (HoNi2B2.1C) but annealed at different temperatures, namely, at 800 and at 1100 °C. Their superconducting transition temperatures differ by more than 10%. Rietveld refinement and difference Fourier analysis reveal subtle differences in the atomic parameters and in the electron density on the carbon site. Furthermore, a new atomic site can be identified for both samples, which is partially occupied with the lighter atoms boron or carbon.

  • Received 30 August 2000

DOI:https://doi.org/10.1103/PhysRevB.63.184518

©2001 American Physical Society

Authors & Affiliations

A. Dertinger*

  • Physikalisches Institut, Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany

R. E. Dinnebier

  • Physikalisches Institut, Kristallographie, Universität Bayreuth, 95440 Bayreuth, Germany

A. Kreyssig

  • Institut für Angewandte Physik, Technische Universität Dresden, 01062 Dresden, Germany

P. W. Stephens and S. Pagola

  • Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11974-3800

M. Loewenhaupt

  • Institut für Angewandte Physik, Technische Universität Dresden, 01062 Dresden, Germany

S. van Smaalen

  • Physikalisches Institut, Kristallographie, Universität Bayreuth, 95440 Bayreuth, Germany

H. F. Braun

  • Physikalisches Institut, Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany

  • *E-mail address: armin@dertinger.de

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Issue

Vol. 63, Iss. 18 — 1 May 2001

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