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- W179938757 abstract "Single crystals K${}_{mathrm{x}}$Fe${}_{2ensuremath{-}y}$Se${}_{2ensuremath{-}z}$S${}_{mathrm{z}}$ ($z$ $=$ 0, 0.4) are successfully synthesized by self-flux method with the superconducting transition temperatures ${T}_{c}$${}^{mathrm{onset}}$ of 31.3 K and 32.8 K, respectively. In contrast to external pressure effect on superconductivity, the substitution of S for Se does not suppress ${T}_{c}$, which suggests that chemical doping may mainly modulate the anion height from the Fe layer rather than compressing interlayer distance. In electron spin resonance (ESR) measurements, a resonance signal arising from the paramagnetic (PM) Fe ions is detected at room temperature for both K${}_{mathrm{x}}$Fe${}_{2ensuremath{-}y}$Se${}_{2}$ and K${}_{mathrm{x}}$Fe${}_{2ensuremath{-}y}$Se${}_{1.6}$S${}_{0.4}$ crystals. Upon cooling, the intensity of the spectrum weakens gradually and displays abrupt decrease below 140 K. The resonance signal disappears around 60 K (ensuremath{sim}2 ${T}_{c}$), corresponding to the saturation temperature of antiferromagnetic (AFM) order revealed by recent neutron-diffraction study. The evolution of ESR spectrum is discussed by correlating with recent neutron-diffraction and Raman-scattering results, in support of the coexistence of superconductivity and AFM order in K${}_{mathrm{x}}$Fe${}_{2ensuremath{-}y}$Se${}_{2}$. Moreover, the variation of resonance field with decreasing temperature for K${}_{mathrm{x}}$Fe${}_{2ensuremath{-}y}$Se${}_{1.6}$S${}_{0.4}$ implies that the doping of S induces local weak ferromagnetism in the parent AFM background." @default.
- W179938757 created "2016-06-24" @default.
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- W179938757 date "2011-11-04" @default.
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- W179938757 title "Coexistence of superconductivity and magnetism in K<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>Fe<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:math>Se<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>2…" @default.
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- W179938757 doi "https://doi.org/10.1103/physrevb.84.174501" @default.
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