Vibrational dynamics in solid α-oxygen: Experimental assessment of spin-phonon couplings

Bernabé, A. de; Cuello, G.J.; Bermejo, F. J.; Trouw, F.; Jansen, Apj Tonek

doi:10.1103/physrevb.58.14442

Cited by 6 publications

(12 citation statements)

References 38 publications

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“…Calculated contributions of magnons (see Fig. 6 in [21]) should appear at E≃5 meV and E≃12.5 meV, which are neither detected in our or their data. The magnon peak positions at lower energies are explained by de Bernabe et al by a decrease of the exchange constant (see Eq.…”

contrasting

confidence: 87%

“…Their results show a mixture of phonons, librons and anti-ferromagnetic excitations (magnons). The peak at E≃10.5 meV at T=5 K in our result is more pro- 6) in [21]) with decreasing temperature. A more general detailed analysis of our neutron scattering data will be presented in a forthcoming paper.…”

supporting

confidence: 44%

“…Although oxygen is a purely coherent scatterer, it can be useful to use this approximation to obtain an estimate of the excitation spectra in the sample [20]. First results of the generalized density of states (T≃4 K and 23 K) were published by de Bernabe et al [21] and Kilburn et al [22]. Their results show a mixture of phonons, librons and anti-ferromagnetic excitations (magnons).…”

mentioning

confidence: 99%

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Production of ultra-cold neutrons in solid α-oxygen

Gutsmiedl

Böhle²,

Frei³

et al. 2011

EPL

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Our recent neutron scattering measurements of phonons and magnons in solid α-oxygen have led us to a new understanding of the production mechanism of ultra-cold-neutrons (UCN) in this super-thermal converter. The UCN production in solid α-oxygen is dominated by the excitation of phonons. The contribution of magnons to UCN production becomes only slightly important above E >10 meV and at E ∼4 meV. Solid α-oxygen is in comparison to solid deuterium less efficient in the down-scattering of thermal or cold neutrons into the UCN energy regime.PACS numbers: 28.20.Cz, 63.20.kk Ultra-cold-neutrons (UCN) are slow enough (∼ 300 neV) to be confined [1] in traps, which can be formed by materials with a high Fermi potential or by a magnetic field (60 neV/T). They can be kept for several minutes in the confinement, and thus be investigated with high precision. UCN are elementary particles that are extremely well suited for low-energy physics experiments. These experiments are investigating fundamental problems unsolved within the framework of the Standard Model [2]. One major experiment is the search for a non-zero electric dipole moment of the neutron [3] (current upper limit 2.9 10 −26 e· cm). Another unique experiment is the precise determination of the lifetime [4] of the free neutron. This value has an important impact on the theory of weak interaction [5].

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confidence: 87%

supporting

confidence: 44%

mentioning

confidence: 99%

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Production of ultra-cold neutrons in solid α-oxygen

Gutsmiedl

Böhle²,

Frei³

et al. 2011

EPL

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“…Magnetic correlations are of a predominant antiferromagnetic character and dominated by nearest neighbors separated by 3.37 Å. Such a value of eff is, however, well above that determined from neutron diffraction 10 for the magnetically ordered ␣ phase at low temperatures corresponding to eff = 1.45 B .…”

Section: Introductionmentioning

confidence: 80%

Spin dynamics in liquid and rotationally disordered solid oxygen

et al. 2008

Self Cite

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The spin and nuclear dynamics of the liquid and plastic-solid phases of molecular oxygen are studied by means of inelastic neutron scattering. A detailed spectral analysis over wide energy-͑0-18 meV͒ and momentum-͑0.2-4.5 Å −1 ͒ transfer ranges permits a robust separation of magnetic and nuclear contributions to the dynamic structure factor. Reliable spin-exchange constants are obtained for both liquid and plastic phases, which are found to be remarkably similar to each other, with no evidence for long-range antiferromagnetic spin correlations beyond next-nearest neighbors. Analysis of the time scales involved in spin-flip processes suggests that spin diffusion in these structurally disordered phases takes place within a lapse of time comparable to the lifetime of an O 4 unit in the liquid.

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“…(The behavior of interplane deformation u zz will be discussed in the next section). The values of phenomenological constants derived from fitting of functions η(T, P ), ∆s/s(T, P ) to experimental data 9,10 with due account of M 0 (T ) temperature dependence 11,12 are given in Table I. It can be seen from the Table I that K eff = K 0 − K 4 + Λ (α) M 2 0 and K 4 are comparable in order of value with the shear modulus of the material 13 .…”

Section: Temperature/pressure Dependence Of Lattice Parametersmentioning

confidence: 99%

Shift of close-packed basal planes as an order parameter of transitions between antiferromagnetic phases in solid oxygen: II. Temperature/pressure dependence of sound velocities and lattice parameters

Gomonay

Локтев

2007

Low Temperature Physics

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In the present paper we generalised a phenomenological model developed in 1 for the description of magnetostructural phase transitions and related peculiarities of elastic properties in solid oxygen under high pressure and/or low (below 40 K) temperature. We show that variation of all the lattice parameters in the vicinity of αβ-phase transition is due to both the shift of basal closed packed planes and appearance of the long-range magnetic order. Competition between these two factors from one side and lattice compression below T αβ from another produces non monotonic temperature dependence of lattice parameter b (along monoclinic axis). Steep decrease of the sound velocities in the vicinity of T αβ can be explained by the softening of the lattice with respect to shift of the close-packed planes (described by the constant K2) prior to phase transition point. We anticipate an analogous softening of sound velocities in the vicinity of αδ-phase transition and non monotonic pressure dependence of sound velocities in α-phase.

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Vibrational dynamics in solid α-oxygen: Experimental assessment of spin-phonon couplings

Cited by 6 publications

References 38 publications

Production of ultra-cold neutrons in solid α-oxygen

Production of ultra-cold neutrons in solid α-oxygen

Spin dynamics in liquid and rotationally disordered solid oxygen

Shift of close-packed basal planes as an order parameter of transitions between antiferromagnetic phases in solid oxygen: II. Temperature/pressure dependence of sound velocities and lattice parameters

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