TY - JOUR
T1 - High pressure collapse of magnetism in Fe0.94O
T2 - Mössbauer spectroscopy beyond 100 GPa
AU - Pasternak, M. P.
AU - Taylor, R. D.
AU - Jeanloz, R.
AU - Li, X.
AU - Nguyen, J. H.
AU - Mc Cammon, C. A.
PY - 1997/1/1
Y1 - 1997/1/1
N2 - First studies of Mössbauer spectroscopy to pressures above 100 GPa are reported. The magnetic state of Fe0.94O was investigated to 120 GPa at T≤300K. At 300 K a diamagnetic low-spin (LS) state of Fe2+ is detected at 90 GPa; its abundance increases with P. The gap between the 5T2g high-spin ground state and the 1A1g LS excited state decreases with increasing P and at 120 GPa the LS species, first observed at 70 K, is fully converted at 450K. The magnetic collapse of Fe1-xO is an isochoric, second-order transition resulting from a gradual increase in the crystal-field with increasing pressure.
AB - First studies of Mössbauer spectroscopy to pressures above 100 GPa are reported. The magnetic state of Fe0.94O was investigated to 120 GPa at T≤300K. At 300 K a diamagnetic low-spin (LS) state of Fe2+ is detected at 90 GPa; its abundance increases with P. The gap between the 5T2g high-spin ground state and the 1A1g LS excited state decreases with increasing P and at 120 GPa the LS species, first observed at 70 K, is fully converted at 450K. The magnetic collapse of Fe1-xO is an isochoric, second-order transition resulting from a gradual increase in the crystal-field with increasing pressure.
UR - http://www.scopus.com/inward/record.url?scp=0001425562&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.79.5046
DO - 10.1103/PhysRevLett.79.5046
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AN - SCOPUS:0001425562
SN - 0031-9007
VL - 79
SP - 5046
EP - 5049
JO - Physical Review Letters
JF - Physical Review Letters
IS - 25
ER -