This title appears in the Scientific Report :
2010
Please use the identifier:
http://dx.doi.org/10.1088/0953-8984/21/43/436008 in citations.
Anomalous hyperfine interaction in CoF2 investigated by high resolution neutron spectroscopy
Anomalous hyperfine interaction in CoF2 investigated by high resolution neutron spectroscopy
We investigated the low energy excitations in CoF(2) in the µeV range with a back-scattering neutron spectrometer. The energy scans on a CoF(2) powder sample revealed inelastic peaks at E = 0.728 ± 0.008 µeV at T = 3.46 K on both energy gain and energy loss sides. The inelastic peaks move gradually...
Saved in:
Personal Name(s): | Chatterji, T. |
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Schneider, G. J. | |
Contributing Institute: |
JCNS; JCNS JARA-FIT; JARA-FIT Neutronenstreuung; IFF-5 Streumethoden; IFF-4 |
Published in: | Journal of physics / Condensed matter, 21 (2009) S. 436008 |
Imprint: |
Bristol
IOP Publ.
2009
|
Physical Description: |
436008 |
DOI: |
10.1088/0953-8984/21/43/436008 |
PubMed ID: |
21832454 |
Document Type: |
Journal Article |
Research Program: |
Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung |
Series Title: |
Journal of Physics: Condensed Matter
21 |
Subject (ZB): | |
Publikationsportal JuSER |
We investigated the low energy excitations in CoF(2) in the µeV range with a back-scattering neutron spectrometer. The energy scans on a CoF(2) powder sample revealed inelastic peaks at E = 0.728 ± 0.008 µeV at T = 3.46 K on both energy gain and energy loss sides. The inelastic peaks move gradually towards lower energy with increasing temperature and finally merge with the elastic peak at the electronic magnetic ordering temperature T(N)≈37 K. We interpret the inelastic peaks to be due to the transition between the hyperfine-split nuclear level of the (59)Co isotopes with spin I = 7/2. We have shown that the energy of the inelastic peak or the hyperfine splitting in CoF(2) can be treated as an order parameter of the antiferromagnetic phase transition and yields the critical exponent β = 0.313 ± 0.007, consistent with the neutron diffraction results and also the three-dimensional Ising character of the magnetic system. The determined hyperfine splitting in CoF(2) deviates from the linear relationship between the ordered electronic magnetic moment and the hyperfine splitting in Co, Co-P amorphous alloys and CoO, presumably due to the presence of an unquenched orbital moment. |