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Journal Article

Pressure effects on the electronic properties of the undoped superconductor ThFeAsN


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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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
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.