Phys. Rev. B 78, 214304 (2008) [9 pages]Inelastic neutron scattering from confined molecular oxygenReceived 11 September 2008; published 29 December 2008 Inelastic neutron-scattering measurements were carried out on condensed bulk and confined molecular oxygen. The phase transitions of the oxygen confined in cylindrical pores with diameter of ≈94 Å are suppressed below their bulk temperatures or in the case of the lowest-temperature transition to the α phase are suppressed entirely. This last observation is possibly due to the low latent heat of transition for this transition. Both elastic and inelastic neutron-scattering data indicate a mixing of oxygen crystal phases upon confinement. Magnetic ordering fluctuations in the β phase are found to have similar energy-dependent profiles for confined and bulk excitations showing that the magnetic correlation function decay is unaffected by the finite crystal size in confinement. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.214304
DOI:
10.1103/PhysRevB.78.214304
PACS:
61.05.fg, 61.43.Gt, 63.22.Kn, 64.60.an
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