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| Home > Publications database > Unconventional Antiferromagnetic Quantum Critical Point in Ba(Fe$_{0.97}$Cr$_{0.03}$)$_2$(As$_{1−x}$P$_x$)$_2$ |
| Home > Publications database > Unconventional Antiferromagnetic Quantum Critical Point in Ba(Fe$_{0.97}$Cr$_{0.03}$)$_2$(As$_{1−x}$P$_x$)$_2$ |
| Journal Article | FZJ-2019-02806 |
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2019
APS
College Park, Md.
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Please use a persistent id in citations: http://hdl.handle.net/2128/22128 doi:10.1103/PhysRevLett.122.037001
Abstract: We have systematically studied physical properties of BaðFe0.97Cr0.03Þ2ðAs1−xPxÞ2, where super-conductivity in BaFe2ðAs1−xPxÞ2is fully suppressed by just 3% of Cr substitution of Fe. A quantum criticalpoint is revealed atx∼0.42, where non-Fermi-liquid behaviors similar to those in BaFe2ðAs1−xPxÞ2areobserved. Neutron diffraction and inelastic neutron scattering measurements suggest that the quantumcritical point is associated with the antiferromagnetic order, which is not of conventional spin-density-wavetype as evidenced by theω=Tscaling of spin excitations. On the other hand, no divergence of low-temperature nematic susceptibility is observed whenxis decreased to 0.42 from higher doping level,demonstrating that there are no nematic quantum critical fluctuations. Our results suggest that non-Fermi-liquid behaviors in iron-based superconductors can be solely resulted from the antiferromagnetic quantumcritical fluctuations, which cast doubts on the role of nematic fluctuations played in the normal-stateproperties in iron-based superconductors.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)
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