Nuclear magnetic resonance on $LaFeAsO_{0.4}H_{0.6}$ at 3.7 GPa
| Autor: | Soshi Iimura, Hideo Hosono, Shusaku Nakagawa, Masayuki Takeuchi, Naoki Fujiwara, Satoru Matsuishi, Takanori Kuwayama |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Materials Science (miscellaneous) General Physics and Astronomy Pressure dependence Spectral line NMR lcsh:QC1-999 Laser linewidth high pressure superconductor Phase (matter) Antiferromagnetism iron pnictide lcsh:Q Physical and Theoretical Chemistry Spin (physics) lcsh:Science Excitation lcsh:Physics |
| Zdroj: | Papers in Physics, Vol 11, p 110002 (2019) |
| ISSN: | 1852-4249 |
| Popis: | A prototypical electron-doped iron-based superconductor $LaFeAsO_{1-x}H_x$ undergoes an antiferromagnetic (AF) phase for $x \geq 0.49$. We performed NMR measurements on $LaFeAsO_{0.4}H_{0.6}$ at 3.7 GPa to investigate the magnetic properties in the vicinity of a pressure-induced QCP. The linewidth of $~^1H$-NMR spectra broadens at low temperatures below 30 K, suggesting that the ordered spin moments remain at 3.7 GPa. The coexistence of gapped and gapless spin excitations was confirmed in the ordered state from the relaxation time $T_1$ of $~^{75}As$. The pressure-induced QCP is estimated to be 4.1 GPa from the pressure dependence of the gapped excitation. Edited by: A. Goñi, A. Cantarero, J. S. Reparaz |
| Databáze: | OpenAIRE |
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