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- W2039821237 abstract "We report on the doping evolution of magnetic susceptibility $ensuremath{chi}(T)$ and Hall coefficient ${R}_{H}$ in high-quality ${mathrm{Ba}}_{1ensuremath{-}x}{mathrm{K}}_{x}{mathrm{Fe}}_{2}{mathrm{As}}_{2}$ $(0.13ensuremath{le}xensuremath{le}1)$ single crystals. It is found that the normal-state magnetic susceptibility of ${mathrm{Ba}}_{1ensuremath{-}x}{mathrm{K}}_{x}{mathrm{Fe}}_{2}{mathrm{As}}_{2}$ compounds undergoes a crossover from linear-$T$ dependence in the undoped and underdoped samples into ${mathrm{KFe}}_{2}{mathrm{As}}_{2}$-type magnetic response in the overdoped samples with increasing K content. Although magnetic susceptibility $ensuremath{chi}(T)$ of optimally doped samples $(0.34ensuremath{le}xensuremath{le}0.47)$ still follows a monotonic increase with increasing temperature, a big hump around 300 K emerges. As $x$ exceeds 0.53, a broad peak forms in overdoped samples $(0.53ensuremath{le}xensuremath{le}1)$, which shifts toward 120 K for the end member ${mathrm{KFe}}_{2}{mathrm{As}}_{2}$. Above the peak temperature ${T}^{*}=120$ K, a Curie-Weiss-like behavior is observed in ${mathrm{KFe}}_{2}{mathrm{As}}_{2}$. The Hall coefficient ${R}_{H}$ of underdoped sample $x=0.22$ shows a rapid increase above spin-density-wave transition temperature ${T}_{SDW}$. Below ${T}_{SDW}$, it increases slowly. ${R}_{H}$ of optimally doped and slightly overdoped samples $(0.34ensuremath{le}xensuremath{le}0.65)$ shows relatively weak temperature dependence and a saturation tendency below 150 K. However, ${R}_{H}$ of K heavily overdoped samples $(0.80ensuremath{le}xensuremath{le}1)$ increases rapidly below 150 K. Meanwhile, the Hall angle $cot{ensuremath{theta}}_{H}$ displays a concave temperature dependence within the doping range $0.22ensuremath{le}xensuremath{le}0.55$, whereas it changes to a convex temperature dependence within the doping range $0.65ensuremath{le}xensuremath{le}1$. The dramatic change coincides with the Lifshitz transition occurring around the critical doping $x=0.80$, where angle photoemission spectroscopy measurements had confirmed that the electron pocket disappears with excess hole doping in the ${mathrm{Ba}}_{1ensuremath{-}x}{mathrm{K}}_{x}{mathrm{Fe}}_{2}{mathrm{As}}_{2}$ system. It is suggested that the characteristic temperature ${T}^{*}$ at around $120ensuremath{sim}150$ K observed in susceptibility and the Hall coefficient, as well as previously reported resistivity data, may indicate an incoherence-coherence crossover in the ${mathrm{Ba}}_{1ensuremath{-}x}{mathrm{K}}_{x}{mathrm{Fe}}_{2}{mathrm{As}}_{2}$ system." @default.
- W2039821237 created "2016-06-24" @default.
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- W2039821237 date "2014-12-05" @default.
- W2039821237 modified "2023-09-23" @default.
- W2039821237 title "Crossover in the magnetic response of single-crystalline<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant=normal>K</mml:mi></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi …" @default.
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- W2039821237 doi "https://doi.org/10.1103/physrevb.90.224508" @default.
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