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Unconventional Antiferromagnetic Quantum Critical Point in Ba (Fe0.97Cr0.03)2 (As1-x Px)2
Zhang W.9; Wei Y.9; Xie T.9; Liu Z.9; Gong D.9; Ma X.9; Hu D.4; Cermak P.10; Schneidewind A.10; Tucker G.6; Meng S.12; Huesges Z.12; Lu Z.12; Song J.1; Luo W.1; Xu L.3; Zhu Z.3; Yin X.5; Li H.-F.5; Yang Y.-F.9; Luo H.9; Li S.9
Source PublicationPhysical Review Letters
ISSN10797114 00319007

We have systematically studied physical properties of Ba(Fe0.97Cr0.03)2(As1-xPx)2, where superconductivity in BaFe2(As1-xPx)2 is fully suppressed by just 3% of Cr substitution of Fe. A quantum critical point is revealed at x∼0.42, where non-Fermi-liquid behaviors similar to those in BaFe2(As1-xPx)2 are observed. Neutron diffraction and inelastic neutron scattering measurements suggest that the quantum critical point is associated with the antiferromagnetic order, which is not of conventional spin-density-wave type as evidenced by the ω/T scaling of spin excitations. On the other hand, no divergence of low-temperature nematic susceptibility is observed when x is 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 quantum critical fluctuations, which cast doubts on the role of nematic fluctuations played in the normal-state properties in iron-based superconductors.

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Indexed BySCIE
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000456782500010
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Cited Times [WOS]:7   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
Corresponding AuthorLi S.
Affiliation1.China Academy of Engineering Physics
2.China Institute of Atomic Energy
3.Huazhong University of Science and Technology
4.Beijing Normal University
5.Universidade de Macau
6.Paul Scherrer Institut
7.Chinese Academy of Sciences
8.Charles University
9.Institute of Physics Chinese Academy of Sciences
10.Forschungszentrum Jülich (FZJ)
11.Rice University
12.Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
13.Songshan Lake Materials Laboratory
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GB/T 7714
Zhang W.,Wei Y.,Xie T.,et al. Unconventional Antiferromagnetic Quantum Critical Point in Ba (Fe0.97Cr0.03)2 (As1-x Px)2[J]. Physical Review Letters,2019,122(3).
APA Zhang W..,Wei Y..,Xie T..,Liu Z..,Gong D..,Ma X..,Hu D..,Cermak P..,Schneidewind A..,Tucker G..,Meng S..,Huesges Z..,Lu Z..,Song J..,Luo W..,Xu L..,Zhu Z..,Yin X..,Li H.-F..,...&Li S..(2019).Unconventional Antiferromagnetic Quantum Critical Point in Ba (Fe0.97Cr0.03)2 (As1-x Px)2.Physical Review Letters,122(3).
MLA Zhang W.,et al."Unconventional Antiferromagnetic Quantum Critical Point in Ba (Fe0.97Cr0.03)2 (As1-x Px)2".Physical Review Letters 122.3(2019).
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