Distribution of lattice constants in CePt3Si observed by Larmor diffraction and SANS

R. Ritz, S. Mühlbauer, C. Pfleiderer, T. Keller, J. White, M. Laver, E. M. Forgan, R. Cubitt, C. Dewhurst, P. G. Niklowitz, A. Prokofiev, E. Bauer

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3 Scopus citations


The non-centrosymmetric heavy fermion compound CePt3Si orders antiferromag-netically at TN = 2.2K, followed by a superconducting transition, where Ts = 0.45 K for high quality samples and T s = 0.75K for lower quality samples. We have used neutron Larmor diffraction to measure the temperature dependence and distribution of the lattice constants in a single crystal of CePt3Si with Ts = 0.75K. In our study we observe an unusually wide range of lattice parameters for the a-axis and c-axis with Δa/a ≈ Δc/c ≈ 10-3. Small angle neutron scattering suggests an abundance of defects along the lattice planes. When taking into account the pressure dependence of T s our study attributes the increased value of Ts in low quality samples to an effective negative pressure.

Original languageEnglish
Article number012165
JournalJournal of Physics: Conference Series
Issue numberSECTION 1
StatePublished - 2010


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