Abstract

The ⁶¹Cu (⁶¹Ni) emission Mössbauer spectra of high-temperature superconducting ceramics are measured, as well as a number of dielectric and antiferromagnetic cupric metal oxides, which are structural analogues of high-temperature superconductors. The ⁶¹Ni nuclei quadrupole coupling constants are determined and their linear correlations are established with the calculated values of the lattice electric field gradient tensor (EFG) created in the copper sites. Linear correlations are found between the ⁶¹Ni and ⁶³Cu nuclei quadrupole coupling constants, which make it possible to determine the valence contribution to the EFG for the both probes.

中文翻译：

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超导铜陶瓷金属氧化物铜位的61 Ni和63 Cu超精细偶联及其介电类似物

摘要

测量了高温超导陶瓷的⁶¹ Cu（⁶¹ Ni）发射Mössbauer光谱，以及许多电介质和反铁磁性的铜金属氧化物，它们是高温超导体的结构类似物。确定了^61个Ni核四极耦合常数，并利用在铜位置生成的晶格电场梯度张量（EFG）的计算值建立了它们的线性相关性。在⁶¹ Ni和⁶³ Cu核四极耦合常数之间发现线性相关性，这使得可以确定两个探针对EFG的化合价贡献。