%0 Journal Article
%A Zhang, Wenliang
%A Wei, Yuan
%A Xie, Tao
%A Liu, Zhaoyu
%A Gong, Dongliang
%A Ma, Xiaoyan
%A Hu, Ding
%A Čermák, Petr
%A Schneidewind, Astrid
%A Tucker, Gregory
%A Meng, Siqin
%A Huesges, Zita
%A Lu, Zhilun
%A Song, Jianming
%A Luo, Wei
%A Xu, Liangcai
%A Zhu, Zengwei
%A Yin, Xunqing
%A Li, Hai-Feng
%A Yang, Yi-feng
%A Luo, Huiqian
%A Li, Shiliang
%T Unconventional Antiferromagnetic Quantum Critical Point in Ba(Fe$_{0.97}$Cr$_{0.03}$)$_2$(As$_{1−x}$P$_x$)$_2$
%J Physical review letters
%V 122
%N 3
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2019-02806
%P 037001
%D 2019
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:30735415
%U <Go to ISI:>//WOS:000456782500010
%R 10.1103/PhysRevLett.122.037001
%U https://juser.fz-juelich.de/record/862500