Non-metallic, non-Fermi-liquid resistivity of FeCrAs from 0 to 17 GPa

• Published in: Journal of physics. Condensed matter Vol. 25; no. 38; p. 385601
• Main Authors: Tafti, F F, Wu, W, Julian, S R
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 25.09.2013; Institute of Physics
• Subjects: Antiferromagnetism; Condensed matter; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electrical resistivity; Exact sciences and technology; Falling; Formations; Neel temperature; Physics; Pressure; Properties of type I and type II superconductors; Superconductivity; Transport properties (electric and thermal conductivity, thermoelectric effects, etc.); Energy gap; Non Fermi liquid; Iron based superconductors; Electrical conductivity; Pressure effects; Neel temperature; Fermi surface; Chromium Iron Arsenides Mixed; High pressure; Spin density waves
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/25/38/385601

An unusual, non-metallic resistivity of the 111 iron-pnictide compound FeCrAs is shown to be relatively unchanged under pressures of up to 17 GPa. Combined with our previous finding that this non-metallic behaviour persists from at least 80 mK to 800 K, this shows that the non-metallic phase is exceptionally robust. Antiferromagnetic order, with a Néel temperature TN ∼ 125 K at ambient pressure, is suppressed by pressure at a rate of 7.0 ± 0.4 K GPa−1, falling to ∼50 K at 10 GPa. We conclude that the formation of a spin-density-wave gap at TN does not play an important role in the non-metallic resistivity of FeCrAs at low temperatures.