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- W2016500302 abstract "The higher energetic magnon at 27 cm−1 was systematically investigated by far-IR-absorption and Raman scattering in α-O2 (T = 11–24 K). The softening of the magnon frequency—described in mean field theory—can be explained by a weakening of the exchange interaction due to thermal expansion and by a loss of magnetic order due to thermal fluctuations. Bandwidth as a function of temperature can be fitted by a power law, with a zero bandwidth at T = 0 K (Γ = aT4.4). Dephasing processes via magnon–magnon scattering are the only meaningful relaxation mechanisms of this magnon mode. The integrated band intensity, normalized to our low temperature value, directly follows the spin–spin correlation function and describes the long range magnetic order parameter in α-O2. The spectral characteristics, band frequency and band intensity (ω and I) prove that the α–β phase transition (at Tαβ = 23.8 K) is not purely magnetic." @default.
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- W2016500302 date "2003-10-17" @default.
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- W2016500302 title "Study of magnon mode characteristics in solid oxygen by high resolution spectroscopy" @default.
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- W2016500302 doi "https://doi.org/10.1088/0953-8984/15/43/019" @default.
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