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Zhang, Wenliang [Author]; Wei, Yuan [Author]; Meng, Siqin [Author]; Huesges, Zita [Author]; Lu, Zhilun [Author]; Song, Jianming [Author]; Luo, Wei [Author]; Xu, Liangcai [Author]; Zhu, Zengwei [Author]; Yin, Xunqing [Author]; Li, Hai-Feng [Author]; Yang, Yi-feng [Author]; Xie, Tao [Author]; Luo, Huiqian [Author]; Li, Shiliang [Author]; Liu, Zhaoyu [Author]; Gong, Dongliang [Author]; Ma, Xiaoyan [Author]; Hu, Ding [Author]; Čermák, Petr [Author]; Schneidewind, Astrid [Author]; Tucker, Gregory [Author]

Unconventional Antiferromagnetic Quantum Critical Point in Ba(Fe$_{0.97}$Cr$_{0.03}$)$_2$(As$_{1−x}$P$_x$)$_2$

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  • Media type: E-Article
  • Title: Unconventional Antiferromagnetic Quantum Critical Point in Ba(Fe$_{0.97}$Cr$_{0.03}$)$_2$(As$_{1−x}$P$_x$)$_2$
  • Contributor: Zhang, Wenliang [Author]; Wei, Yuan [Author]; Meng, Siqin [Author]; Huesges, Zita [Author]; Lu, Zhilun [Author]; Song, Jianming [Author]; Luo, Wei [Author]; Xu, Liangcai [Author]; Zhu, Zengwei [Author]; Yin, Xunqing [Author]; Li, Hai-Feng [Author]; Yang, Yi-feng [Author]; Xie, Tao [Author]; Luo, Huiqian [Author]; Li, Shiliang [Author]; Liu, Zhaoyu [Author]; Gong, Dongliang [Author]; Ma, Xiaoyan [Author]; Hu, Ding [Author]; Čermák, Petr [Author]; Schneidewind, Astrid [Author]; Tucker, Gregory [Author]
  • imprint: APS, 2019
  • Published in: Physical review letters 122(3), 037001 (2019). doi:10.1103/PhysRevLett.122.037001
  • Language: English
  • DOI: https://doi.org/10.1103/PhysRevLett.122.037001
  • ISSN: 0031-9007; 1079-7114; 1092-0145
  • Origination:
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  • Description: 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.
  • Access State: Open Access