Hyperfine Field and Electric Field Gradient at Various Cation Sites in RBa2Cu2NbO8 and RSr2Cu2GaO7
作者： Atsushi Yamanaka , Ken-ichi Kumagai , Yuri Piskunov , Andery Yakubovsky
DOI: 10.1143/JPSJ.65.3336
关键词:
摘要: We have investigated antiferromagnetic nuclear resonance (AFNMR) for Cu-site as well magnetic (NMR) and quadrupolar (NQR) resonances La, Nb, Ga-sites in insulators RBa 2 Cu NbO 8 ( R=La, Pr, Nd) RSr GaO 7 Nd, Y). Hyperfine fields at the are very close to values published 3 O 6 analogs. Quadrupolar frequencies also those but these about 50% higher. Axially symmetric electric field gradient La Nb-sites asymmetric one accord with their structures. Split NQR spectrum Ga NdSr evidences different Cu-AF spin stacking sequence this material. Possible cation disorder is discussed.
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