Thermal Conductivity in Mixed Alkali Halides: KCl:Li and KBr:Li

Baumann, Fred; Harrison, John P.; Pohl, Robert Wichard; Seward, W. D.

doi:10.1103/physrev.159.691

Cited by 59 publications

(9 citation statements)

References 30 publications

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“…This failure suggests a more complex situation possibly tied to a multilevel spectrum, in the spirit of those developed for alkali halides compounds such as KCl:Li for instance or in dipolar glasses. 67,68 In this regard, incoherent inelastic neutron scattering experiments would be worthwhile to probe the sub-meV energy range and determine the distribution of tunneling energies.…”

Section: Phase Purity and Microstructure Of The Polycrystalline Samplementioning

confidence: 99%

Tl_0.6Mo₃S₅, an original large tunnel-like molybdenum sulfide with Mo zigzag chains and disordered Tl cations

et al. 2021

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Section: Phase Purity and Microstructure Of The Polycrystalline Samplementioning

confidence: 99%

Tl_0.6Mo₃S₅, an original large tunnel-like molybdenum sulfide with Mo zigzag chains and disordered Tl cations

et al. 2021

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“…In this limit, the magnons and phonons are in thermal equilibrium, 1.e. T = Tm e Tph Measurements from thls limited region are then truly representative of the combination of the two subsystems conducting heat independently as assumed in equation (25). It is quite obvious from equations (40) and 41that the coefficient 9 controls the validity of the experimental result.…”

Section: Phmentioning

confidence: 99%

Magnetic field effects on the thermal conductivity of Co[(NH2)2CS]4Cl

Ni¹

1970

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for very helpful discussions and suggestions concerning the experimental aspects of low temperature work; and to Prof. Robert Malhiot for early guidance in preparing his graduate study in physics. He wishes also to thank Mr. J. Benade and Mr. M. Duda for letting him share the benefit of their professional knowledge on machine shop work and for doing the machining of the cryostat; and R. Carlson, J. Vandendorpe, and J. Morel who helped in many ways. The financial support provided for this project by the Atomic Energy Commision is also gratefully acknowledged. Finally, the author wishes to thank his wife, Louisa, for her help in typing the thesis and for her great patience and continuous encouragement.

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“…The concentration for Q 67 (E||(100)) was determined by spectrochemical analysis and is believed accurate to about 30%. 8 It is known 1 that a classical oscillator which is damped through radiation at its resonance frequency coo would show a scattering strength proportional to coo 2 .…”

Section: [R(e)-r(g)~]/r(0)mentioning

confidence: 99%

“…8 A slightly different method was used in the present paper to extract the phenomenological phononscattering rate Tdef -1 [Eq. (1)] from the experimental data.…”

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Thermal Conductivity of KCl: Li. Isotope and Electric Field Effects

1969

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The resonance scattering of phonons in KC1 :Li has been studied through thermal-conductivity measurements of crystals containing Li 6 and Li 7 , and also of crystals in which the tunneling states of the lithium ion were polarized through an applied electric field. In all cases the resonance scattering can be very well described phenomenologically with a single-resonance relaxation rate of the form (?^4/coo 2 )(co/coo) 2 / [1-(co/coo) 2 ] 2 , where coo appears to be the weighted average of the tunneling frequencies. The lighter isotope causes an upward shift of coo by 45%, which agrees with the isotope effect observed for the tunnel splitting in specific-heat measurements. This is considered strong evidence that the phonon scattering is indeed caused by an interaction with the tunneling states. The electric-field-induced shift of coo also is consistent with the known Stark shifts of the tunneling states. The single resonance is explained with the picture that all tunneling states contribute to the scattering, and that the resolution of the thermal-conductivity measurements used for phonon spectroscopy is insufficient to resolve the scattering by the individual states. The scattering strength A, to a good approximation, is found to be proportional to co 0 2 , regardless of whether coo is changed by applying electric fields or by changing the isotopic mass. This behavior is that of a classical oscillator which is damped by radiation at its resonance frequency co 0 . It is concluded that the combined scattering by the tunneling states, as observed in thermal conductivity, is similar to that of a classical oscillator. For lithium concentrations in excess of 3X10 18 cm -3 , the thermal conductivity saturates below 1°K. This behavior is similar to that observed earlier in specific-heat measurements. The origin of this saturation is still not understood and requires further study.

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Thermal Conductivity in Mixed Alkali Halides: KCl:Li and KBr:Li

Cited by 59 publications

References 30 publications

Tl_0.6Mo₃S₅, an original large tunnel-like molybdenum sulfide with Mo zigzag chains and disordered Tl cations

Tl_0.6Mo₃S₅, an original large tunnel-like molybdenum sulfide with Mo zigzag chains and disordered Tl cations

Magnetic field effects on the thermal conductivity of Co[(NH<sub>2</sub>)<sub>2</sub>CS]<sub>4</sub>Cl

Thermal Conductivity of KCl: Li. Isotope and Electric Field Effects

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Thermal Conductivity in Mixed Alkali Halides: KCl:Li and KBr:Li

Cited by 59 publications

References 30 publications

Tl0.6Mo3S5, an original large tunnel-like molybdenum sulfide with Mo zigzag chains and disordered Tl cations

Tl0.6Mo3S5, an original large tunnel-like molybdenum sulfide with Mo zigzag chains and disordered Tl cations

Magnetic field effects on the thermal conductivity of Co[(NH<sub>2</sub>)<sub>2</sub>CS]<sub>4</sub>Cl

Thermal Conductivity of KCl: Li. Isotope and Electric Field Effects

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Tl_0.6Mo₃S₅, an original large tunnel-like molybdenum sulfide with Mo zigzag chains and disordered Tl cations

Tl_0.6Mo₃S₅, an original large tunnel-like molybdenum sulfide with Mo zigzag chains and disordered Tl cations