Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.77: Poster

Thursday, February 28, 2008, 14:00–18:00, Poster B

Heat capacity, thermal expansion and magnetic properties of the itinerant ferromagnet MnSi — •Qin Zhang¹, William Knafo^1,2, Frédéric Hardy^1,2, Kai Grube¹, Peter Schweiss¹, Hilbert v. Löhneysen^1,2, Christoph Meingast¹, and Thomas Wolf¹ — ¹Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany — ²Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany

MnSi, which is one of the most studied weak itinerant ferromagnetic systems, has recently attracted considerable attention due to its novel magnetic phase diagram under pressure and associated non-Fermi-liquid like resistivity [1,2]. Here, we present heat capacity, thermal expansion, magnetostriction and magnetization data on several different MnSi crystals, which were grown either from Mn, Si or Sn flux using the Bridgman method. Our results show that the details of the magnetic ordering transition depend strongly on whether the crystal is grown from Mn or Si enriched flux, although single-crystal x-ray refinements of these crystals show no difference of the Mn and Si site occupation within an error of ± 0.5 %.

[1] C. Pfleiderer, D. Reznik, L. Pintschovius, H. v. Löhneysen, M. Garst, A. Rosch, Nature 427 (2004) 227

[2] C. Pfleiderer, S.R. Julian, G.G. Lonzarich, Nature 414 (2001) 427