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000862500 0247_ $$2doi$$a10.1103/PhysRevLett.122.037001
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000862500 1001_ $$0P:(DE-HGF)0$$aZhang, Wenliang$$b0
000862500 245__ $$aUnconventional Antiferromagnetic Quantum Critical Point in Ba(Fe$_{0.97}$Cr$_{0.03}$)$_2$(As$_{1−x}$P$_x$)$_2$
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000862500 520__ $$aWe have systematically studied physical properties of BaðFe0.97Cr0.03Þ2ðAs1−xPxÞ2, where super-conductivity in BaFe2ðAs1−xPxÞ2is fully suppressed by just 3% of Cr substitution of Fe. A quantum criticalpoint is revealed atx∼0.42, where non-Fermi-liquid behaviors similar to those in BaFe2ðAs1−xPxÞ2areobserved. Neutron diffraction and inelastic neutron scattering measurements suggest that the quantumcritical point is associated with the antiferromagnetic order, which is not of conventional spin-density-wavetype as evidenced by theω=Tscaling of spin excitations. On the other hand, no divergence of low-temperature nematic susceptibility is observed whenxis decreased to 0.42 from higher doping level,demonstrating that there are no nematic quantum critical fluctuations. Our results suggest that non-Fermi-liquid behaviors in iron-based superconductors can be solely resulted from the antiferromagnetic quantumcritical fluctuations, which cast doubts on the role of nematic fluctuations played in the normal-stateproperties in iron-based superconductors.
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000862500 7001_ $$0P:(DE-HGF)0$$aWei, Yuan$$b1
000862500 7001_ $$0P:(DE-HGF)0$$aXie, Tao$$b2
000862500 7001_ $$0P:(DE-HGF)0$$aLiu, Zhaoyu$$b3
000862500 7001_ $$0P:(DE-HGF)0$$aGong, Dongliang$$b4
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000862500 7001_ $$0P:(DE-HGF)0$$aMeng, Siqin$$b10
000862500 7001_ $$0P:(DE-HGF)0$$aHuesges, Zita$$b11
000862500 7001_ $$0P:(DE-HGF)0$$aLu, Zhilun$$b12
000862500 7001_ $$0P:(DE-HGF)0$$aSong, Jianming$$b13
000862500 7001_ $$0P:(DE-HGF)0$$aLuo, Wei$$b14
000862500 7001_ $$0P:(DE-HGF)0$$aXu, Liangcai$$b15
000862500 7001_ $$0P:(DE-HGF)0$$aZhu, Zengwei$$b16
000862500 7001_ $$0P:(DE-HGF)0$$aYin, Xunqing$$b17
000862500 7001_ $$0P:(DE-HGF)0$$aLi, Hai-Feng$$b18
000862500 7001_ $$0P:(DE-HGF)0$$aYang, Yi-feng$$b19
000862500 7001_ $$0P:(DE-HGF)0$$aLuo, Huiqian$$b20
000862500 7001_ $$0P:(DE-HGF)0$$aLi, Shiliang$$b21$$eCorresponding author
000862500 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.122.037001$$gVol. 122, no. 3, p. 037001$$n3$$p037001$$tPhysical review letters$$v122$$x1079-7114$$y2019
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