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- W2040313120 abstract "We report on experimental evidence of different electronic phases in the superconductor ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{4}$${mathrm{O}}_{8}$: simple metallic CuO chains and highly correlated ${mathrm{CuO}}_{2}$ planes. ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{4}$${mathrm{O}}_{8}$ is a genuine untwinned compound; hence, we were able to determine the anisotropy of the resistivity along the a and b directions. Along the b direction (chain and plane conduction channels), a normal metallic temperature behavior of the chain dominates. For the a direction (only plane conduction channel), the resistivity reveals an unconventional behavior with a kink at 160 K, becoming linear at higher temperatures. Further, we present results of the dynamical (optical) conductivity of the ${mathrm{CuO}}_{2}$ plane as a function of frequency and temperature. The frequency dependence of the optical conductivity is consistent with a model of ferromagnetic polarons in an antiferromagnetic matrix. This is further confirmed by a depolarization experiment which is sensitive to crystal regions with different spin polarizations. The temperature behavior of the thermal occupation of the ground state is in agreement with a real-space condensation." @default.
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- W2040313120 title "Low-energy and low-temperature properties of untwinned<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow…" @default.
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- W2040313120 doi "https://doi.org/10.1103/physrevb.49.13164" @default.
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