The scattering of lattice vibrations by a point defect: I

McCombie, Charles; Slater, Jennifer M.

doi:10.1088/0370-1328/84/4/304

Cited by 29 publications

(6 citation statements)

References 6 publications

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“…5,6 The situation of a Kr atom doped to solid CH 4 is similar to the situation of neon impurity in solid parahydrogen. The phonon scattering on heavy isotopic impurities 19 was used successfully to describe the thermal conductivity of solid parahydrogen with the neon impurity. 20 Thus, following Ref.…”

Section: B Kr-doped Crystals Chmentioning

confidence: 99%

Heat transfer in solidCH4: Influence of an atomic impurity (Kr)

et al. 1998

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The measurements of thermal conductivity of solid methane with krypton impurity ͑concentrations of the impurity were 0.015%, 0.338%, and 1.105%͒ were performed in the temperature range from 1.4 K to 20 K. The analysis of the experimental data of both pure and impurity containing crystals was performed within the framework of the time-relaxation model. The temperature dependence of thermal conductivity of solid methane was described by using the following phonon-scattering processes: boundary scattering, phonon-phonon scattering (U processes͒, scattering by point defects, and elastic interaction with the rotational motion of methane molecules. It was shown that the elastic interaction of phonons with almost freely rotating molecules (O h symmetry sites͒ is the main phonon relaxation process that determines the thermal conductivity of methane in the low-temperature phase. The value of the phonon-rotational interaction parameter in this phase was obtained. The process of resonance phonon scattering on a heavy isotope impurity was used to describe the impurity effect of Kr. The analysis showed that the temperature dependence of thermal conductivity of doped methane can be described with the assumption that the introduction of the atomic impurity of Kr deforms the rotational spectrum of methane.

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Section: B Kr-doped Crystals Chmentioning

confidence: 99%

Heat transfer in solidCH4: Influence of an atomic impurity (Kr)

et al. 1998

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“…The form chosen, which was as given by McCombie and Slater (1964), included only the effect of mass changes, and as strain and force constant changes are unlikely to be negligible some way of combining these effects is required. In fitting calculated curves to their thermal conductivity results, BL took effects other than those due to mass difference into account approximately by varying the parameter AM/M in the mass defect relaxation rate:…”

Section: Point Defect Scatteringmentioning

confidence: 99%

Thermal effects of the absorption of CO₂laser radiation by water vapor

Левин¹,

Сорокин²,

Starik³

1986

Sov. J. Quantum Electron.

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Results of measurements of the thermal conductivity of crystals of 3He and 4He containing up to 0.1% Ne which have already been reported by Berman and Livesley are considered in more detail. The way in which the various changes associated with a point defect should be combined to obtain the net phonon scattering strength is considered and a qualitative argument is used to show how the observed results may be explained by a compensation of the effect of mass changes by force constant changes. A form for the equilibrium temperature-concentration phase diagram is suggested and is shown to be consistent with most of the observations, but some results obtained at high concentrations remain puzzling.

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“…For scattering by phonon-induced transitions between two levels, | and |6>, of a non-Kramers ion such as Ni2+, the contribution to the relaxation time is given by (Orbach 1962 where An J M is the population difference for the two levels per unit mass of the crystal, g(ho) -£ab) is the lineshape function for the transition, £ab being the most probable transition energy; and |<a|£«^|& >| = is an average spin-lattice a m atrix element for the transition over phonons of all wave vectors and polariza tions (a refers to a normal strain of the surroundings of the magnetic ion).…”

Section: T1)mentioning

confidence: 99%

The thermal conductivity of Ni ² + doped KMgF ₃ in a magnetic field at low temperatures: the effect of single ions and coupled pairs

Harley

Rosenberg

1970

Proc. R. Soc. Lond. A

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The thermal conductivity between 0.4 and 4.2 K and in magnetic fields up to 50 kOe of KMgF 3 doped with Ni 2+ has been measured. The results are analysed to give values of the average spin-lattice coupling constants ( x Sl ) for the Ni 2+ ion. These are in agreement with values calculated using the magneto-elastic constants (GX1 and 6r44) derived from acoustic paramagnetic resonance (a.p.r.) experiments. Below IK the thermal resistivity as a function of magnetic field shows a number of anomalies, for which possible causes are discussed; it is concluded that they result from phonon interactions with exchange-coupled pairs of Ni 2+ ions. Such pairs are also observed in a.p.r. experiments.

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The scattering of lattice vibrations by a point defect: I

Cited by 29 publications

References 6 publications

Heat transfer in solidCH4: Influence of an atomic impurity (Kr)

Heat transfer in solidCH4: Influence of an atomic impurity (Kr)

Thermal effects of the absorption of CO₂laser radiation by water vapor

The thermal conductivity of Ni ² + doped KMgF ₃ in a magnetic field at low temperatures: the effect of single ions and coupled pairs

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The scattering of lattice vibrations by a point defect: I

Cited by 29 publications

References 6 publications

Heat transfer in solidCH4: Influence of an atomic impurity (Kr)

Heat transfer in solidCH4: Influence of an atomic impurity (Kr)

Thermal effects of the absorption of CO2laser radiation by water vapor

The thermal conductivity of Ni 2 + doped KMgF 3 in a magnetic field at low temperatures: the effect of single ions and coupled pairs

Contact Info

Product

Resources

About

Thermal effects of the absorption of CO₂laser radiation by water vapor

The thermal conductivity of Ni ² + doped KMgF ₃ in a magnetic field at low temperatures: the effect of single ions and coupled pairs