Journal Article

PreJuSER-721

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic ordering and negative thermal expansion in PrFeAsO

Kimber, S. A. J. ; Argyriou, D. N. ; Yokaichiya, F. ; Habicht, K. ; Gerischer, S. ; Hansen, T. ; Chatterji, T.FZJ* ; Klingeler, R. ; Hess, C. ; Behr, G. ; Kondrat, A. ; Büchner, B.

2008
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/11086  doi:10.1103/PhysRevB.78.140503

Abstract: We report the structure and magnetism of PrFeAsO, one of the parent phases of the Fe-As family of superconductors, as measured by neutron powder diffraction. In common with other REFeAsO materials, a tetragonal-orthorhombic phase transition is found on cooling below 136 K and striped Fe magnetism with k=(1,0,1) is detected below similar to 85 K. Our magnetic order-parameter measurements show that the ordered Fe moment along the a axis reaches a maximum at similar to 40 K, below which an anomalous expansion of the c axis sets in that results in a negative thermal volume expansion of 0.015% at 2 K. We propose that this effect, which is suppressed in superconducting samples, is driven by a delicate interplay between Fe and Pr ordered moments.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Streumethoden (IFF-4)
2. Neutronenstreuung (IFF-5)
3. JCNS (Jülich Centre for Neutron Science JCNS (JCNS) ; JCNS)
4. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Kondensierte Materie (P54)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Appears in the scientific report 2008

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Database coverage:
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