Pressure effects on the electronic properties of the undoped superconductor ThFeAsN
| Autor: | Zurab Shermadini, Toni Shiroka, Guanghan Cao, Tingting Shang, Cao Wang, Ilya Eremin, Joël Mesot, H. R. Ott, Nicolò Barbero, Stefan Holenstein, Felix Lochner, Rustem Khasanov |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Condensed Matter - Superconductivity Doping Relaxation (NMR) FOS: Physical sciences Knight shift 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Superconductivity (cond-mat.supr-con) Magnetization Atomic orbital Condensed Matter::Superconductivity 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Penetration depth Pnictogen |
| Zdroj: | Physical Review B, 97 (14) |
| DOI: | 10.48550/arxiv.1804.06683 |
| Popis: | The recently synthesized ThFeAsN iron-pnictide superconductor exhibits a $T_c$ of 30 K, the highest of the 1111-type series in 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 ${}^{75}$As Knight shift, the spin-lattice relaxation rates, and the magnetic penetration depth suggest a multi-band $s^{\pm}$-wave gap symmetry in the dirty limit, while the gap-to-$T_c$ ratio $\Delta/k_\mathrm{B}T_c$ hints at a strong-coupling scenario. Pressure modulates the geometrical parameters, thus reducing $T_c$, as well as $T_m$, the temperature where magnetic-relaxation rates are maximized, both at the same rate of approximately -1.1 K/GPa. This decrease of $T_c$ with pressure is consistent with band-structure calculations, which relate it to the deformation of the Fe 3$d_{z^2}$ orbitals. Comment: 6 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|