SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 4: f-Electron Systems and Heavy Fermions I
TT 4.12: Talk
Monday, March 27, 2023, 12:30–12:45, HSZ 201
Structural and electronic instabilities in high pressure CeSb2 — •Christian K. de Podesta1, Theodore I. Weinberger1, Oliver P. Squire1, Stephen A. Hodgson1, Jiasheng Chen1, Rustem Khasanov2, Christine Beavers3, Patricia L. Alireza1, and F. Malte Grosche1 — 1Uniersity of Cambridge, UK — 2Paul Scherrer Institut, Switzerland — 3Diamond Light Soure, UK
The Kondo-lattice material CeSb2 undergoes a cascade of at least three magnetic transitions below 16 K and - unusually for a Ce system - settles on a ferromagnetic ground state. Whereas these transitions are initially hardly affected by applied pressure, they disappear abruptly above 18 kbar. We find that this disappearance is caused by a pressure induced structural change. The high pressure structure of CeSb2 is profoundly different. It hosts a highly renormalised heavy fermion state which itself undergoes further magnetic transitions at very low temperature. Magnetic order within the high pressure structure extrapolates to zero at a pressure tuned quantum critical point, inducing a new superconducting phase with an anomalous field dependence[1].
We present the first detailed account of the high pressure crystal structure of CeSb2 from X-ray diffraction, alongside a comprehensive study of the associated magnetic order, using µSR, AC-heat capacity and resistivity measurements. This provides the foundation on which to understand the anomalous superconducting properties which are thought to emerge from the quantum critical point.
[1] O. P. Squire et al., arXiv:2211.00975 (2022)