- PHYSICAL SOC JAPAN
We performed P-31-NMR measurements on LaFe(As1-xPx)O to investigate the relationship between antiferromagnetism and superconductivity. The antiferromagnetic (AFM) ordering temperature T-N and the moment mu(ord) are continuously suppressed with increasing P content x and disappear at x = 0.3 where bulk superconductivity appears. At this superconducting x = 0.3, quantum critical AFM fluctuations are observed, indicative of the intimate relationship between superconductivity and low-energy AFM fluctuations associated with the quantum-critical point in LaFe(As1-xPx)O. The relationship is similar to those observed in other isovalent-substitution systems, e.g., BaFe2(As1-xPx)(2) and SrFe2(As1-xPx)(2), with the '' 122 '' structure. Moreover, the AFM order reappears with further P substitution (x > 0.4). The variation of the ground state with respect to the P substitution is considered to be linked to the change in the band character of Fe-3d orbitals around the Fermi level.
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- DOI : 10.7566/JPSJ.83.023707
- ISSN : 0031-9015
- Web of Science ID : WOS:000331226300008