Thermal properties of smoky quartz at very low temperatures

Chaussy, J.; Gilchrist, John; Lasjaunias, J.C.; Saint-Paul, M.; Nava, R.

doi:10.1016/0022-3697(79)90141-0

Cited by 17 publications

(16 citation statements)

References 24 publications

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“…Experimental data support the idea that at low temperatures the hole moves in a double well potential in which the particle may tunnel through the potential barrier between two inequivalent minima associated with the two oxygen ions nearest to an aluminium impurity [2,3], generating a two level system (TLS). Random electric fields due to ionized defects and local strains result in a broad distribution N(E) of the energy splittings, confirmed by the large linearly temperature-dependent contribution to the specific heat [4,5], and by the dielectric results [2,5]. A localization temperature TL proportional to the width of the distribution is estimated to vary between 2 and 9 K [2,5].…”

mentioning

confidence: 76%

“…Random electric fields due to ionized defects and local strains result in a broad distribution N(E) of the energy splittings, confirmed by the large linearly temperature-dependent contribution to the specific heat [4,5], and by the dielectric results [2,5]. A localization temperature TL proportional to the width of the distribution is estimated to vary between 2 and 9 K [2,5]. TL characterizes the degree of imperfection of the crystal.…”

mentioning

confidence: 82%

“…The long dielectric relaxation time (7~ ~ 10-3 S at 4 K) suggests that the electronic defects are weakly coupled to the lattice phonons. Moreover, the thermal conductivity is unchanged in comparison with non-irradiated quartz below 1 K [5,7], and no resonant absorption is detected in high frequency ultrasonic attenuation experiments [6].…”

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confidence: 92%

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Short-time-scale specific heat experiments on smoky quartz

Saint-Paul¹

1980

J. Phyique Lett.

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2014 Des mesures de chaleur spécifique en temps courts ont été effectuées sur des échantillons de quartz naturel irradiés par rayonnement gamma. Elles ont été réalisées avec des temps de l'ordre de la milliseconde aux températures de l'hélium liquide. Une réduction de la chaleur spécifique a été mise en évidence dans cet intervalle de temps entre 1,4 K et 4,2 K. Abstract. 2014 Short-timescale specific heat measurements have been performed on gamma irradiated natural quartz crystals in the millisecond timescale at liquid helium temperatures. Evidence for a reduction of the specific heat has been observed in this timescale between 1.4 K and 4.2 K.

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confidence: 76%

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confidence: 82%

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Short-time-scale specific heat experiments on smoky quartz

Saint-Paul¹

1980

J. Phyique Lett.

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“…A is broadly distributed, the dielectric results above 1 K [2] and specific heat results . The dipole moments P are apparent values (in Debye), without taking into account the local field correction [3, 71, the angle 0 = 60" between P a n d the C-axis has been discussed in [3]. N ( 0 ) P2 cos2 0 and N ( 0 ) Pg are deduced from t h e relaxation intensities A, and A,, respectively ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Relaxation in Smoky Quartz at Very Low Temperatures

Saint-Paul¹,

Frossati²

1982

Physica Status Solidi (b)

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Audiofrequency dielectric measurements down to 4 mK on y-irradiated quartz are reported. A t the lowest temperatures, the mean relaxation rate increases uith dipole concentration and shows a field dependence in small ac measuring fields. Similar properties are observed in other dielectric systems containing randomly distributed electric dipoles.Nous rapportons des mesures didlectriques effectukes d a m le domaine audiofrkquence et L trAa basse temperature (4 mK) sur du quartz fume. A trks basse temperature la frequence moyenne de relaxation augmente avec la concentration dipolaire et depend du champ alternatif de mesure bien que le champ soit faible. Des propriitt6a similaires ont ittit observites dans d'autres systemes dielectriques contenant des dipoles distribues albatoirement.

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“…Among these materials are neutron irradiated quartz [5], smoky quartz [6], and doped ~-alumina [7]. In this paper we present another way of approaching this problem.…”

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confidence: 99%

Ultrasonic propagation in a fluorozirconate glass from 0.08 K to 250 K

Doussineau

Matecki

1981

J. Phyique Lett.

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The attenuation and phase velocity variation of longitudinal and transverse ultrasonic waves have been measured in the fluorozirconate glass 57.5 % ZrF 4, 33.75 % BaF2 and 8.75 % ThF4, in the temperature range 0.08 to 250 K. The usual behaviour of amorphous insulators has been observed at the lowest temperatures indicating the existence of two-level tunnelling systems (TLS). From these acoustic measurements not only the coupling constants between TLS and longitudinal and transverse acoustic waves, but also the TLS density of states have been determined

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Thermal properties of smoky quartz at very low temperatures

Cited by 17 publications

References 24 publications

Short-time-scale specific heat experiments on smoky quartz

Short-time-scale specific heat experiments on smoky quartz

Dielectric Relaxation in Smoky Quartz at Very Low Temperatures

Ultrasonic propagation in a fluorozirconate glass from 0.08 K to 250 K

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