Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.2: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Heavy fermion behaviour and structural change in high pressure CeSb₂ — Zhuo Feng¹, •Yang Zou¹, Terence Giles², Philipp Niklowitz², Heribert Wilhelm³, Giulio I. Lampronti⁴, and F. Malte Grosche¹ — ¹Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK — ²Dep. of Physics, Royal Holloway, University of London, Egham TW20 0EX, UK — ³Beamline I15, Diamond Light Source, Didcot OX11 0DE, UK — 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 transition 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 9 K and 12 K [1]. These transition are suppressed above a hydrostatic pressure p_c ≃ 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 p_c. Whereas in the low pressure structure, CeSb₂ is local moment magnet, in the high pressure structure it exhibits tranport properties characteristic of a heavy fermion material with a low Kondo temperature scale of the order of 10 K.
Bud’ko et al. PRB 57,21 (1998)