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Gd sup 3+ exchange interaction as measured by NMR in hydrogen-doped GdBa sub 2 Cu sub 3 O sub 7 H sub 1. 55

Journal Article · · Physical Review (Section) B: Condensed Matter; (USA)
; ; ;  [1]; ; ;  [2]
  1. Institut d'Electronique Fondamentale, Batiment 220, Universite Paris Sud, F-91405 Orsay CEDEX, France (FR)
  2. Laboratoire d'Hydrogene et Defauts dans les Metaux, Btiment 350, Universite Paris Sud, F-91405 Orsay CEDEX, France (FR)
Proton NMR in nonsuperconducting GdBa{sub 2}Cu{sub 3}O{sub 7}H{sub 1.55} was measured at liquid-helium temperature by a spin-echo method. The negative shift of the resonance spectrum was found to be proportional to the dc magnetic field. This shift is shown to arise from the demagnetizing field due to a canted spin structure. The Gd exchange parameter is estimated to be {ital J}{approx equal}0.05 K, showing that the exchange energy is higher than the dipole one. Hydrogen doping has no effect on the gadolinium ordering temperature.
OSTI ID:
5067902
Journal Information:
Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:16; ISSN PRBMD; ISSN 0163-1829
Country of Publication:
United States
Language:
English