Temperature pulses in dielectric solids

Ackerman, Christian; Guyer, R. A.

doi:10.1016/0003-4916(68)90320-5

Cited by 214 publications

(85 citation statements)

References 45 publications

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“…Measurements were made to observe the crossover from second sound in normal solid 4 He at high temperature to ballistic phonon propagation at lower temperature. We confirmed the results of the second sound propagation by earlier investigators [26] and extended the low temperature measurements [21] to pressures higher than the melting pressure. We focused our attention on the temperature range below 300 mK, where NCRI effects had been detected in torsion oscillator experiments.…”

Section: Velocity Of Heat Pulse Propagationsupporting

confidence: 90%

“…The second sound propagation as defined here in a dielectric solid is then a propagation of collective oscillation in phonon density. It has been observed in solid 4 He and 3 He [24][25][26], sodium fluoride [27][28][29] and bismuth [30].…”

Section: Heat Pulse and Second Sound Propagation In Normal Solidmentioning

confidence: 97%

“…(1) for analysis of our crossover data. The second sound propagation in normal solid 4 He was first observed [25] and studied by Ackerman and Guyer [26]. They measured the changes in temperature pulse shape from diffusion to second sound wave propagation in solid 4 He up to 130 bar, and determined the second sound velocity and the normal phonon scattering relaxation time from the broadening of the temperature pulse.…”

Section: Heat Pulse and Second Sound Propagation In Normal Solidmentioning

confidence: 99%

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Search for fourth sound propagation in supersolid He4

Aoki

Kojima

Lin

2008

Low Temperature Physics

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A systematic study was carried out to search for fourth sound propagation solid 4 He samples below 500 mK down to 40 mK between 25 and 56 bar using the techniques of heat pulse generator and titanium superconducting transition edge bolometer. If solid 4 He is endowed with superfluidity below 200 mK as indicated by recent torsional oscillator experiments, theories predict fourth sound propagation in such supersolid state. If found, fourth sound provides a convincing evidence for superfluidity and a new tool for studying the new phase. To search for a fourth sound-like mode, the response of the bolometers to heat pulses traveling through cylindrical samples of solids grown with different crystal qualities. Bolometers with increasing sensitivity were constructed. The heater generator amplitude was reduced to the sensitivity limit to search for any critical velocity effects. The fourth sound velocity is expected to vary as µ r r s / . Searches were made for signature in the bolometer response with such characteristic temperature dependence. The measured response signal has not so far revealed any signature of new propagating mode within the temperature excursion of 5 mK from the background signal shape. Possible reasons for this negative result are discussed. Prior to the fourth sound search, the temperature dependence of heat pulse propagation was studied as it transformed from «second sound» in the normal solid 4 He to the transverse ballistic phonon propagation. Our work extended the studies by Narayanamurti and Dynes [Phys. Rev. B12, 1731(1975] to higher pressures and to lower temperatures. The measured transverse ballistic phonon propagation velocity remained constant, within 0.3% scatter of data below 100 mK at all pressures and revealed no indication for an onset of supersolidity. The overall dynamic thermal response of solid to heat input was found to depend strongly on the sample preparation procedure.

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Section: Velocity Of Heat Pulse Propagationsupporting

confidence: 90%

Section: Heat Pulse and Second Sound Propagation In Normal Solidmentioning

confidence: 97%

Section: Heat Pulse and Second Sound Propagation In Normal Solidmentioning

confidence: 99%

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Search for fourth sound propagation in supersolid He4

Aoki

Kojima

Lin

2008

Low Temperature Physics

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“…All these models consider the heat carriers as a fluid, whose hydrodynamic-like equations of motion describe the heat transport. The phonon hydrodynamics lays on the Guyer-Krumhansl transport equation [16][17][18][19][20][21][22] for the heat flux q, i.e., (1) τq…”

Section: Heat Transport Equations Beyond the Fourier Law And Hydrodynmentioning

confidence: 99%

Constitutive equations for heat conduction in nanosystems and nonequilibrium processes: an overview

Jou¹,

Cimmelli

2016

Communications in Applied and Industrial Mathematics

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“…TheI1!lal transport takes the form of wave propagat ion with a finite velocity. This phenomena is referred to as second sOlUld, in thatphonon heat pulses have been ob~erved to propagate macroscopic distances in a manner analogous to phonon acoustic pulses [16].…”

Section: Tbermal Transport: Time Domainmentioning

confidence: 99%

Picosecond Transient Thermoreflectance: Time-Resolved Studies of Thin Film Thermal Transport

Eesley

1987

Review of Progress in Quantitative Nondestructive Evaluation

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Temperature pulses in dielectric solids

Cited by 214 publications

References 45 publications

Search for fourth sound propagation in supersolid He4

Search for fourth sound propagation in supersolid He4

Constitutive equations for heat conduction in nanosystems and nonequilibrium processes: an overview

Picosecond Transient Thermoreflectance: Time-Resolved Studies of Thin Film Thermal Transport

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