2012/05/17 by Bayrammurad Saparov, B. Saparov, J. E. Mitchell +3
Materials Science · Physics and Astronomy · #2D Materials and Applications #Antiferromagnetism #Ferromagnetism #Iron-based superconductors research #Magnetization #Magnetoresistance #Paramagnetism #Pauli exclusion principle #Seebeck coefficient #Thermal conductivity #Topological Materials and Phenomena #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/25/8/084016
published as Supercond. Sci. Technol. 25 (2012) 084016 · 7 figures; Will be published in the upcoming focus issue in Superconductor Science and Technology
arxiv created 2012/05/17 · openalex publication_date 2012/07/17 · arxiv updated 2012/07/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present thermodynamic and transport properties of transition-metal ( T ) arsenides, T As, with T = Sc to Ni (3d), Zr, Nb, Ru (4d), Hf and Ta (5d). Characterization of these binaries is carried out with powder x-ray diffraction, temperature- and field-dependent magnetization and resistivity, temperature-dependent heat capacity, Seebeck coefficient, and thermal conductivity. All binaries show metallic behavior except TaAs and RuAs. TaAs, NbAs, ScAs and ZrAs are diamagnetic, while CoAs, VAs, TiAs, NiAs and RuAs show approximately Pauli paramagnetic behavior. FeAs and CrAs undergo antiferromagnetic ordering below T N ≈ 71 K and T N ≈ 260 K, respectively. MnAs is a ferromagnet below T C ≈ 317 K and undergoes hexagonal–orthorhombic–hexagonal transitions at T S ≈ 317 K and 384 K, respectively. For T As, Seebeck coefficients vary between + 40 and − 40 μV K −1 in the 2–300 K range, whereas thermal conductivity values stay below 18 W m −1 K −1 . The Sommerfeld coefficients γ are less than 10 mJ K −2 mol −1 . At room temperature with application of 8 T magnetic field, large positive magnetoresistance is found for TaAs (∼25%), MnAs (∼90%) and NbAs (∼75%).