Pressure-induced quantum critical point in the heavily hydrogen-doped iron-based superconductor LaFeAsO
Masayoshi Takeuchi, Naoki Fujiwara, Takanori Kuwayama, Satoshi Nakagawa, Soshi Iimura, Satoru Matsuishi, Youichi Yamakawa, Hiroshi Kontani, Hideo Hosono
DOI 10.1103/PhysRevB.99.174517 · Physical Review B
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Abstract
An iron-based superconductor LaFeAsO1−xHx(0≤x≤0.6) undergoes two antiferromagnetic (AF) phases upon H doping. We investigated the second AF phase (x=0.6) using NMR techniques under pressure. At pressures up to 2 GPa, the ground state is a spin-density-wave state with a large gap; however, the gap closes at 4.0 GPa, suggesting a pressure-induced quantum critical point. Interestingly, the gapped excitation coexists with gapless magnetic fluctuations at pressures between 2 and 4 GPa. This coexistence is attributable to the lift up of the dxy orbital to the Fermi level, a Lifshitz transition under pressure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO1-xHx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAs1-xPxO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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