Abstract
Specific heat and magnetic susceptibility measurements on single crystals of RE 2CuO 4 ( RE= Pr, Nd, and Sm) indicate antiferromagnetic order at T N≲1.5 K and 5.95 K for RE = Nd and Sm, respectively. The susceptibility of all RE 2CuO 4 compounds is highly anisotropic and suggests the presence of crystal field effects.
Highlights
Specificheat and magneticsusceptibilitymeasurementson singlecrystalsof RE2CuO4(RE= Pr, Nd, and Sm) indicateantiferromagneticorder at TN< 1.5 K and 5.95 K for RE=Nd and Sin, respectively.The susceptibilityof all RE2CuO4compoundsis highlyanisotropicand suggeststhe presenceofcrystalfieldeffects
Some work on the RE2CuO4compounds has been reported, most of it has been on sintered compacts [8] from which it is not possible to determine the extent of anisotropic behaviour expected on the basis of strongly two-dimensional nature of the crystal structure
X-ray analysis at room temperature found the I4/mmm crystal structure and that the tetragonal c-axis was perpendicular to the faces of these plate-like crystals
Summary
Specificheat and magneticsusceptibilitymeasurementson singlecrystalsof RE2CuO4(RE= Pr, Nd, and Sm) indicateantiferromagneticorder at TN< 1.5 K and 5.95 K for RE=Nd and Sin, respectively.The susceptibilityof all RE2CuO4compoundsis highlyanisotropicand suggeststhe presenceofcrystalfieldeffects. These two classes of CuO2layer compounds differ; Hall coefficient and thermoelectric power measurements on La2CuO4+6 suggest conduction by hole-like carriers, whereas, in Tokura et al [6 ] have found that substituting Ce into RE2_xCexCuO4, where RE = Pr, Nd and Sm, induces electron superconductivity with Tc~ 20 K in these compounds which retain the I4/mmm structure of RE2CuO4 [7 ].
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