Physics – Condensed Matter – Superconductivity
Scientific paper
2004-09-04
JMR 167 (2004), 317-321
Physics
Condensed Matter
Superconductivity
5 pages, 3 figures
Scientific paper
10.1016/j.jmr.2004.01.005
We present an angle dependent nuclear quadrupole resonance (ADNQR) method to determine the electric field gradient asymmetry parameter eta in systems where the resonance line is so broad that the radio frequency field can excite only a portion of the nuclear spins. In this situation the recently developed spectroscopic methods are not applicable. ADNQR is useful for single crystals and oriented powders, and, for small eta determines eta^4. Therefore, it can be used to evaluate fluctuations in eta due to inhomogeneities. We demonstrate the application of ADNQR experimentally to oriented superconducting YBa2Cu3O7 powder.
Keren Amit
Levy Shahar
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