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Interplanar coupling between CuO2planes in Eu1.9Y0.1CuO4single crystals

Authors
Journal
Physica B Condensed Matter
0921-4526
Publisher
Elsevier
Publication Date
Volume
233
Identifiers
DOI: 10.1016/s0921-4526(97)00307-4
Keywords
  • Rare Earth Cuprates
  • Weak Ferromagnetism
  • Weak Ferromagnetic Resonance
Disciplines
  • Physics

Abstract

Abstract We present detailed do magnetization and magnetic resonance for an Eu 1.9Y 0.1CuO 4 single crystal. The substitution of Eu by non-magnetic Y 3+ allowed us to measure the weak ferromagnetic properties of the ordered Cu lattice with the interference of just the weakly magnetic Eu 3+ ions. A Néel temperature, T N ∼ 250 K, and a value of the saturation magnetization m s (6 K) ∼ 5 × 10 −3 μ B/Cu-atom, were obtained from the data. We observed anisotropy effects in the magnetization within the CuO 2 planes. The data were analyzed using a four sublattice magnetic free energy for the ordered Cu spins. From the magnetic resonance data taken at Q band (34 GHz) we have determined the temperature dependence of the out-of-plane and in-plane anisotropy fields. Using an average value for the exchange field 〈 H e〉 = 80 G, we estimate a value for the interplanar exchange constant, Jτ = 19 mK, similar to the values previously found in La 2CuO 4 and Y 2CuO 4.

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