A study of the orientation dependence of the 63Cu nuclear magnetic resonance in the (Tl0.5Pb0.5)Sr2(Ca1−yYy)Cu2O7-δsystem
| Autor: | Ru-Shi Liu, Peter P. Edwards, G.P. Dai, D.P. Tunstall |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Materials science
Energy Engineering and Power Technology Resonance Knight shift Condensed Matter Physics Electronic Optical and Magnetic Materials NMR spectra database Nuclear magnetic resonance Solid-state nuclear magnetic resonance Quadrupole Electrical and Electronic Engineering Nuclear quadrupole resonance Two-dimensional nuclear magnetic resonance spectroscopy Electric field gradient |
| Zdroj: | Physica C: Superconductivity. 220:93-100 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(94)90888-5 |
| Popis: | Nuclear magnetic resonance (NMR) results for copper-63 nuclei in the Tl-based 1212 system (Tl 0.5 Pb 0.5 )Sr 2 (Ca 1- y Y y )Cu 2 O 7-δ (0.0⩽ y ⩽0.8) are reviewed. We report the NMR spectra both on random powder samples and partially aligned powder samples. After deconvoluting the random fraction from the partially aligned spectra, we obtain the resonance frequency as a function of θ, the angle between c -axis and the applied magnetic field B . Using the theoretical equation to fit the experimental data, we calculate the isotropic Knight shift, K iso , the axial Knight shift, K ax , and the quadrupole resonance frequency v Q for each value of y (0⩽ y ⩽0.8). Nuclear quadrupole resonance (NQR) on the y =0.0 sample was performed. The measured quadrupole resonance frequency is in very good agreement with the result from the NMR experimental data. We correlate these dependences on y of the resonance parameters with other structural trends. |
| Databáze: | OpenAIRE |
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