Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.7: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Heavy fermion behaviour in the high pressure structure of CeSb2 — •Vitaly Fedoseev1, Zhuo Feng1, Yang Zou1, Terence Giles2, Philipp Niklowitz2, Heribert Wilhelm3, Giulio Lampronti4, and F. Malte Grosche11Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK — 2Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, UK — 3Beamline I15, Diamond Light Source, Didcot OX11 0DE — 4Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK

The Kondo lattice system CeSb2 crystallises in the orthorhombic SmSb2 structure and exhibits a series of magnetic phase transitions at low temperature. It has been reported to become ferromagnetic below 15 K, with the ordered moment oriented within the basal plane, and to undergo two further transitions at 9K and 12K [1]. These transition are suppressed above a hydrostatic pressure pc ≃ 16  kbar. We present high pressure transport and x-ray diffraction results, which examine the high pressure state of CeSb2. Our findings suggest that CeSb2 undergoes a drastic structural change at pc into a new and now fully resolved crystal structure. Whereas in the low pressure structure, CeSb2 is a local moment magnet, in the high pressure structure it exhibits transport properties characteristic of a heavy fermion material with a low Kondo temperature scale of the order of 10 K.

[1] Bud’ko et al. PRB 57, 21 (1998)

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