TY - JOUR
T1 - Relationship between superconductivity and antiferromagnetism in LaFe(As1-xPx)O revealed by 31P-NMR
AU - Kitagawa, Shunsaku
AU - Iye, Tetsuya
AU - Nakai, Yusuke
AU - Ishida, Kenji
AU - Wang, Cao
AU - Cao, Guang Han
AU - Xu, Zhu An
PY - 2014/2/15
Y1 - 2014/2/15
N2 - We performed 31P-NMR measurements on LaFe(As1-xP x)O to investigate the relationship between antiferromagnetism and superconductivity. The antiferromagnetic (AFM) ordering temperature T N and the moment μord 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(As 1-xPx)O. The relationship is similar to those observed in other isovalent-substitution systems, e.g., BaFe2(As 1-xPx)2 and SrFe2(As 1-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.
AB - We performed 31P-NMR measurements on LaFe(As1-xP x)O to investigate the relationship between antiferromagnetism and superconductivity. The antiferromagnetic (AFM) ordering temperature T N and the moment μord 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(As 1-xPx)O. The relationship is similar to those observed in other isovalent-substitution systems, e.g., BaFe2(As 1-xPx)2 and SrFe2(As 1-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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U2 - 10.7566/JPSJ.83.023707
DO - 10.7566/JPSJ.83.023707
M3 - Article
AN - SCOPUS:84894184068
SN - 0031-9015
VL - 83
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 2
M1 - 023707
ER -