Physical properties of RBi2 (R=La,Ce) under pressure

2019/07/19 by Li Xiang, Elena Gati, Kathryn Neilson +2
Materials Science · Physics and Astronomy · #Antiferromagnetism #Electrical resistivity and conductivity #Hydrostatic equilibrium #Hydrostatic pressure #Iron-based superconductors research #Laminar flow #Rare-earth and actinide compounds #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el

paper · pdf · doi:10.1103/physrevmaterials.3.095006

published as Phys. Rev. Materials 3, 095006 (2019)

arxiv created 2019/07/19 · openalex created_date 2019/07/30 · openalex publication_date 2019/09/24 · arxiv updated 2019/10/02 · openalex updated_date 2026/08/05

Abstract

We present a study of electrical transport properties of RBi₂ (R=La,Ce) under hydrostatic pressure up to \ensuremath∼2.5 GPa. These measurements are complemented by thermodynamic measurements of the specific heat on CeBi₂ at different pressures up to 2.55 GPa. For CeBi₂, we find a moderate increase of the antiferromagnetic transition, T_N, from 3.3 K to 4.4 K by pressures up to 2.55 GPa. Notably, resistance measurements for both CeBi₂ and LaBi₂ show signatures of superconductivity for pressures above \ensuremath∼1.7 GPa. However, the absence of superconducting features in specific-heat measurements for CeBi₂ indicates that superconductivity in CeBi₂ (and most likely LaBi₂ as well) is not bulk and likely originates from traces of Bi flux, either on the surface of the platelike samples, or trapped inside the sample as laminar inclusions. Finally, we point out that extra caution should be exercised when claiming superconductivity based just on transport measurements, especially for Bi-containing compounds.

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