Nuclear Bragg scattering of synchrotron radiation with strong speedup of coherent decay, measured on antiferromagnetic 57 <mml:mi mathvariant="…
1987; American Physical Society; Volume: 59; Issue: 3 Linguagem: Inglês
10.1103/physrevlett.59.355
ISSN1092-0145
AutoresU. van Bürck, R. L. Mößbauer, E. Gerdau, R. Rüffer, R. Hollatz, G. V. Smirnov, J. P. Hannon,
Tópico(s)High-pressure geophysics and materials
ResumoA strongly speeded-up decay of a collective nuclear excitation has been observed in pure nuclear resonance diffraction of synchrotron-radiation pulses by a perfect single crystal of antiferromagnetic $^{57}\mathrm{FeBo}_{3}$. Superimposed appeared a quantum-beat spectrum exhibiting the interference of four hyperfine transitions. The angular dependence of the time spectrum was verified with measurements above, below, and at the exact Bragg position. The off-Bragg measurements reveal sensitively the weak quadrupole interaction in $^{57}\mathrm{FeBO}_{3}$. .AE
Referência(s)