Low-Temperature Thermal Conductivity of High-Purity and Doped Tantalum Single Crystals after Plastic Deformation

Wasserbäch, W.; Abens, S.; Sahling, S.

doi:10.1002/1521-3951(200011)222:2<425::aid-pssb425>3.0.co;2-x

Cited by 5 publications

(10 citation statements)

References 73 publications

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“…Recent measurements of the low-temperature lattice thermal conductivity in highpurity monocrystalline tantalum specimens [6,7] revealed that plastic deformation has a pronounced effect. After plastic deformation, the magnitude of the lattice thermal conductivity was reduced by a factor of more than 100 and the phonon mean free path had a minimum at about 0.5 K which corresponds a resonance frequency of 2 Â 10 11 Hz.…”

Section: Comparison With Other Experimental Resultsmentioning

confidence: 83%

“…2), a magnitude of the lattice thermal conductivity at T ¼ 0.1 K is obtained which is by a factor of about 10 too high as compared with the experimental values of the thermal conductivity. In the case of highpurity tantalum, from internal friction experiments [5] a magnitude of the lattice thermal conductivity is obtained which is by a factor of about 15 too high as compared with the experimental values of the thermal conductivity [7,8]. A similar difference of a factor 10 has been observed in the case of high-purity niobium single crystals deformed at 195 K [4].…”

Section: The Interaction Of Phonons With Mobile Kinks In Dislocationsmentioning

confidence: 99%

“…For the calculation of the thermal conductivity k and the phonon mean free path l a resonance frequency w 0 % 10 11 Hz was chosen and a Koehler distribution of dislocation segment lengths [38] (for details of the calculation, see [7]). The phonon mean free path l has a similar temperature dependence and magnitude as in the case of kink oscillations and exhibits a minimum at T % 0.2 K. However, an unrealistic short dislocation line length L % 5 Â 10 --8 m must be assumed to explain the resonance frequency of 10 11 Hz, whereas in acoustic experiments it is found that the lengths have a typical value of about 1 mm [38].…”

Section: Comparison With Other Models Of a Dynamic Phonon-dislocationmentioning

confidence: 99%

“…The present work is part of an experimental and theoretical programme in which the nature of the interaction between phonons and dislocations has been investigated in high-purity crystalline specimens of aluminum, niobium and tantalum [1][2][3][4][5][6][7][8]. The interaction mechanisms were studied using different experimental techniques such as internal friction Q --1 [1][2][3][4][5], lattice thermal conductivity j [3,[6][7][8], specific heat c p [6,8] and heat release [6].…”

Section: Introductionmentioning

confidence: 99%

“…The interaction mechanisms were studied using different experimental techniques such as internal friction Q --1 [1][2][3][4][5], lattice thermal conductivity j [3,[6][7][8], specific heat c p [6,8] and heat release [6]. Comparison between experimental results and theoretical models requires that the defect structure of the investigated specimens be known (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Low-Temperature Acoustic and Thermal Properties of Plastically Deformed, High-Purity Polycrystalline Aluminum

Wasserbäch¹,

Abens

Sahling

et al. 2001

phys. stat. sol. (b)

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The low-temperature internal friction Q --1 , thermal conductivity j, specific heat c p and heat release of plastically deformed, high-purity aluminum polycrystals have been investigated and have been compared with measurements on an amorphous SiO 2 specimen. Plastic deformation has a pronounced effect on both internal friction Q --1 and thermal conductivity j in the superconducting state. The magnitude of the internal friction Q --1 can be increased over two orders by plastic deformation over that observed on an annealed sample, and approaches a value approximately equal to that of the amorphous SiO 2 specimen. The lattice thermal conductivity j of the deformed specimens also has a magnitude which is of the same order as that of amorphous SiO 2 , it is, however, nearly independent of the amount of deformation. No "glass-like" anomalies could be observed in the specific heat c p and heat release measurements. The specific heat c p approaches a T 3 -relationship at the lowest temperatures investigated, and heat release experiments clearly show no longtime energy relaxation effects. Thus, it must be concluded that the defects introduced into deformed aluminum cannot be described with the tunneling model which had been proposed to describe the low temperature elastic and thermal properties of amorphous solids and which is based on the assumption of a constant spectral density of tunneling states. The phonon scattering mechanism observed in the deformed aluminum is tentatively related to the interaction of phonons with geometrical kinks in dislocations.

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Section: Comparison With Other Experimental Resultsmentioning

confidence: 83%

Section: The Interaction Of Phonons With Mobile Kinks In Dislocationsmentioning

confidence: 99%

Section: Comparison With Other Models Of a Dynamic Phonon-dislocationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Low-Temperature Acoustic and Thermal Properties of Plastically Deformed, High-Purity Polycrystalline Aluminum

Wasserbäch¹,

Abens

Sahling

et al. 2001

phys. stat. sol. (b)

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Low-Temperature Internal Friction in High-Purity Monocrystalline and Impure Polycrystalline Niobium after Plastic Deformation

Wasserbäch¹,

Thompson

2001

phys. stat. sol. (a)

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The internal friction Q --1 of plastically deformed, high-purity monocrystalline and impure polycrystalline niobium specimens was measured in the temperature range between 65 mK and about 2 K. Plastic deformation has a pronounced effect on the internal friction Q --1 of the high-purity monocrystalline specimens, and the effect has been found to be almost temperature independent. By contrast, surprisingly, the internal friction Q --1 of the impure polycrystalline specimens was found to be almost independent of the extent of plastic deformation. Comparison of the experimental results with different models of a dynamic scattering of acoustic phonons by dislocations leads to the conclusion that the results cannot be explained with the two-level tunneling model. Instead it is suggested that a strong interaction between acoustic phonons and geometrical kinks in nonscrew dislocations is responsible for the observed internal friction Q --1 .

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Low temperature thermal properties of vitreous silica and plastically deformed pure aluminium

Sahling

Abens

2001

Solid State Communications

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Low-Temperature Thermal Conductivity of High-Purity and Doped Tantalum Single Crystals after Plastic Deformation

Cited by 5 publications

References 73 publications

Low-Temperature Acoustic and Thermal Properties of Plastically Deformed, High-Purity Polycrystalline Aluminum

Low-Temperature Acoustic and Thermal Properties of Plastically Deformed, High-Purity Polycrystalline Aluminum

Low-Temperature Internal Friction in High-Purity Monocrystalline and Impure Polycrystalline Niobium after Plastic Deformation

Low temperature thermal properties of vitreous silica and plastically deformed pure aluminium

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