Magnetic and Transport Properties in $CoSr_2Y_{1-x}Ca_xCu_2O_7$ ($x$=0$\sim$0.4)

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dc.creatorLuo, X. G.
dc.creatorChen, X. H.
dc.creatorLiu, X.
dc.creatorWang, R. T.
dc.creatorXiong, Y. M.
dc.creatorWang, C. H.
dc.creatorWang, G. Y.
dc.creatorQiu, X. G.
dc.date2004-08-04
dc.date.accessioned2026-07-07T02:59:35Z
dc.date.available2026-07-07T02:59:35Z
dc.descriptionMagnetic and transport properties of $Co Sr_2 Y_{1-x} Ca_x Cu_2 O_7$ ($x=0 \sim 0.4$) system have been investigated. A broad maximum in M(T) curve, indicative of low-dimensional antiferromagnetic ordering originated from $CoO_{1+δ}$ layers, is observed in Ca-free sample. With increasing Ca doping level up to 0.2, the M(T) curve remains almost unchanged, while resistivity is reduced by three orders. Higher Ca doping level leads to a drastic change of magnetic properties. In comparison with the samples with $x=0.0 \sim 0.2$, the temperature corresponding to the maximum of M(T) is much lowered for the sample $x$=0.3. The sample $x$=0.4 shows a small kink instead of a broad maximum and a weak ferromagnetic feature. The electrical transport behavior is found to be closely related to magnetic properties for the sample $x$=0.2, 0.25, 0.3, 0.4. It suggests that $CoO_{1+δ}$ layers are involved in charge transport in addition to conducting $CuO_2$ planes to interpret the correlation between magnetism and charge transport. X-ray photoelectron spectroscopy studies give an additional evidence of the the transfer of the holes into the $CoO_{1+δ}$ charge reservoir.
dc.identifierhttps://arxiv.org/abs/cond-mat/0408081
dc.identifierhttp://arxiv.org/abs/cond-mat/0408081
dc.identifierPhys. Rev. B 70, 054520 (2004)
dc.identifierdoi:10.1103/PhysRevB.70.054520
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24564
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleMagnetic and Transport Properties in $CoSr_2Y_{1-x}Ca_xCu_2O_7$ ($x$=0$\sim$0.4)
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