Relationship between Superconductivity and Antiferromagnetism in LaFe(As${}_{1-x}$P${}_x$)O Revealed by ${}^{31}$P-NMR

Abstract

We performed ${}^{31}$P-NMR measurements on LaFe(As${}_{1-x}$P${}_x$)O to investigate the relationship between antiferromagnetism and superconductivity. The antiferromagnetic (AFM) ordering temperature $T_{\mathrm{N}}$ and the moment ${\mu }_{\mathrm{ord}}$ 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(As${}_{1-x}$P${}_x$)O. The relationship is similar to those observed in other isovalent-substitution systems, e.g., BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ and SrFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$, 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-3$d$ orbitals around the Fermi level.

5 pages, 3 figures, accepted for publication in J. Phys. Soc. Jpn

References in corpus (19)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• High-temperature superconductivity in iron-based materials
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in La(O_{1-x}F_{x})FeAs Revealed by ^{75}As and ^{139}La Nuclear Magnetic Resonance
• Commensurate Itinerant Antiferromagnetism in BaFe2As2: 75As-NMR Studies on a Self-Flux Grown Single Crystal
• Bandwidth and Fermi surface of Iron-Oxypnictides: covalency and sensitivity to structural changes
• Iron pnictides as a new setting for quantum criticality
• 19-F NMR Investigation of Iron-pnictide Superconductor LaFeAsO(0.89)F(0.11)
• Pseudogap and Superconductivity in Iron-Based Layered Superconductor studied by Fluctuation-Exchange Approximation
• Doping evoluton of antiferromagnetic order and structural distortion in LaFeAsO${}_{1-x}$F${}_x$
• Superconductivity in LaFeAs${}_{1-x}$P${}_x$O: effect of chemical pressures and bond covalency
• On the Superconductivity of LaFe1-yCoyAsO1-xFx
• Stripe antiferromagnetic correlations in LaFeAsO1-xFx probed by 75As NMR
• Spin Dynamics in Iron-based Layered Superconductor (La_{0.87}Ca_{0.13})FePO Revealed by ^{31}P and ^{139}La NMR Studies
• Crossover from commensurate to incommensurate antiferromagnetism in stoichiometric NaFeAs revealed by single-crystal 23Na,75As-NMR experiments
• Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic transition in LaFeAs(O_{1-x}F_x) probed by ^{75}As and ^{139}La NMR

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• Origin of the non-monotonic variance of Tc in the 1111 iron based superconductors with isovalent doping
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• NMR evidence for an intimate relationship between antiferromagnetic spin fluctuations and extended s-wave superconductivity in mono-crystalline SrFe2(As_{1-x}P_{x})2
• Theoretical study on the correlation between the spin fluctuation and $T_c$ in the isovalent-doped 1111 iron-based superconductors
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• Nodal-to-nodeless superconducting order parameter in LaFeAs${}_{1-x}$P${}_x$O synthesized under high pressure
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• Enhanced superconductivity and moderate spin fluctuations suppressed at low energies in heavily electron-doped La1111-based superconductor
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• Crystalline anisotropy induces a second antiferromagnetic phase in the absence of SDW in the heavily hydrogen-doped LaFeAsO${}_{1-x}$H${}_x$ $(x\sim 0.5)$
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