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Pressure effects on the electronic properties of the undoped superconductor ThFeAsN

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Lochner,  Felix
Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Institut für Theoretische Physic III, Ruhr-Universität Bochum, D-44801 Bochum, Germany;

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Citation

Barbero, N., Holenstein, S., Shang, T., Shermadini, Z. G., Lochner, F., Eremin, I. M., et al. (2018). Pressure effects on the electronic properties of the undoped superconductor ThFeAsN. Physical Review B, 97(14): 140506. doi:10.1103/PhysRevB.97.140506.


Cite as: http://hdl.handle.net/21.11116/0000-0001-E823-2
Abstract
The recently synthesized ThFeAsN iron pnictide superconductor exhibits a Tc of 30 K, the highest of the 1111-type series in the absence of chemical doping. To understand how pressure affects its electronic properties, we carried out microscopic investigations up to 3 GPa via magnetization, nuclear magnetic resonance, and muon-spin rotation experiments. The temperature dependence of the As75 Knight shift, the spin-lattice relaxation rates, and the magnetic penetration depth suggest a multiband s±-wave gap symmetry in the dirty limit, whereas the gap-to-Tc ratio Δ/kBTc hints at a strong-coupling scenario. Pressure modulates the geometrical parameters, thus reducing Tc as well as Tm, the temperature where magnetic-relaxation rates are maximized, both at the same rate of approximately -1.1K/GPa. This decrease in Tc with pressure is consistent with band-structure calculations, which relate it to the deformation of the Fe 3dz2 orbitals. © 2018 American Physical Society.