Abstract

Dielectric and magnetic properties of the Nd_{2 – x}Ce_xCuO_{4 + δ} bulk single crystal with x = 0.1 are studied in this work. The anisotropy of the field and temperature dependences of the specific magnetization is found. The value of specific magnetization measured in the magnetic field applied in parallel to CuO₂ planes is higher than that measured in the magnetic field applied perpendicular to the planes; this is related to the additional contribution of magnetic moments of neodymium ions. In this case, at temperatures T < 100 K, when the magnetic field H is perpendicular to CuO₂ planes, an area of antiferromagnetic coupling of ions exists within the CuO₂ planes, which is not observed in the case of the parallel orientation of the magnetic field with respect to the CuO₂ planes. Microwave studies show the existence of strong permittivity dispersion, which indicates the presence of natural resonance frequency, whose value is beyond the frequency range of performed measurements.

中文翻译：

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Nd1.9Ce0.1CuO4+δ单晶磁性各向异性和介电常数

摘要

本工作研究了x = 0.1的 Nd _{2 – x} Ce _x CuO _{4 + δ}块状单晶的介电和磁性能。发现了特定磁化强度的场的各向异性和温度依赖性。在平行于CuO ₂平面施加的磁场中测得的比磁化值高于在垂直于平面施加的磁场中测得的值；这与钕离子磁矩的额外贡献有关。在这种情况下，在温度T < 100 K 时，当磁场H垂直于 CuO ₂在平面上，CuO ₂平面内存在离子的反铁磁耦合区域，这在磁场相对于CuO ₂平面平行取向的情况下观察不到。微波研究表明存在强介电常数色散，这表明存在固有共振频率，其值超出执行测量的频率范围。