Thermometry by Arrays of Tunnel Junctions

Pekola, Jukka P.; Hirvi, K. P.; Kauppinen, Juha; Paalanen, M. A.

doi:10.1103/physrevlett.73.2903

Cited by 225 publications

(254 citation statements)

References 6 publications

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“…Thermometry in this regime [6][7][8] typically faces similar challenges as cooling nanostructures and is ideally integrated on-sample. Among numerous sensors, 13 Coulomb blockade thermometers 14 (CBTs) are simple to use and self-calibrating yet offer high accuracy, demonstrated down to ∼20 mK. 15 Here, we present an improved nuclear refrigerator (NR) for cooling nanoelectronic samples and use it to investigate CBTs and their mechanisms of cooling.…”

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confidence: 99%

Metallic Coulomb blockade thermometry down to 10 mK and below

Casparis

Meschke²,

Maradan³

et al. 2012

Review of Scientific Instruments

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We present an improved nuclear refrigerator reaching 0.3 mK, aimed at microkelvin nanoelectronic experiments, and use it to investigate metallic Coulomb blockade thermometers (CBTs) with various resistances R. The high-R devices cool to slightly lower T , consistent with better isolation from the noise environment, and exhibit electron-phonon cooling ∝ T 5 and a residual heat-leak of 40 aW. In contrast, the low-R CBTs display cooling with a clearly weaker T -dependence, deviating from the electron-phonon mechanism. The CBTs agree excellently with the refrigerator temperature above 20 mK and reach a minimum-T of 7.5 ± 0.2 mK.

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confidence: 99%

Metallic Coulomb blockade thermometry down to 10 mK and below

Casparis

Meschke²,

Maradan³

et al. 2012

Review of Scientific Instruments

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“…Due to reduced thermal coupling, these samples are extremely susceptible to heat leaks such as vibrations 25 , microwave radiation 26,27 , heat release 17 and electronic noise 20 . Metallic Coulomb blockade thermometers (CBTs) have been established as precise and reliable electronic thermometers 18,28,29 , operating down to 10 mK and slightly below 21,22,24,30 . These typically consist of linear arrays of Al/AlO x /Al tunnel junctions with metallic islands in-between, consisting mainly of copper, see Fig.…”

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On-and-off chip cooling of a Coulomb blockade thermometer down to 2.8 mK

Palma

Scheller

Maradan

et al. 2017

Applied Physics Letters

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Cooling nanoelectronic devices below 10 mK is a great challenge since thermal conductivities become very small, thus creating a pronounced sensitivity to heat leaks. Here, we overcome these difficulties by using adiabatic demagnetization of both the electronic leads and the large metallic islands of a Coulomb blockade thermometer. This reduces the external heat leak through the leads and also provides on-chip refrigeration, together cooling the thermometer down to 2.8 ± 0.1 mK. We present a thermal model which gives a good qualitative account and suggests that the main limitation is heating due to pulse tube vibrations. With better decoupling, temperatures below 1 mK should be within reach, thus opening the door for μK nanoelectronics.

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“…The second was to measure accurately the temperature at high magnetic fields given the non-negligible magneto-resistance of the RuO 2 thermometers used in the set-up and the absence of any zero-field zone. This second problem was resolved by using Coulomb Blockade Thermometry(CBT) [12]. An array of 100 tunnel junctions provided by Nanoway (Finland) was attached to the cold finger and used as a fieldindependent thermometer [13] for calibrating the shift in the resistance of RuO 2 thermometers with the application of magnetic field.…”

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Test of the Wiedemann-Franz Law in an Optimally Doped Cuprate

et al. 2004

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We present a study of heat and charge transport in Bi2+xSr2−xCuO 6+δ focused on the size of the low-temperature linear term of the thermal conductivity at optimal doping level. In the superconducting state, the magnitude of this term implies a d-wave gap with an amplitude close to what has been reported. In the normal state, recovered by the application of a magnetic field, measurement of this term and residual resistivity yields a Lorenz number L = κN ρ0/T = 1.3 ± 0.2L0 . The departure from the value expected by the Wiedemann-Franz law is thus slightly larger than our estimated experimental resolution.

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Thermometry by Arrays of Tunnel Junctions

Cited by 225 publications

References 6 publications

Metallic Coulomb blockade thermometry down to 10 mK and below

Metallic Coulomb blockade thermometry down to 10 mK and below

On-and-off chip cooling of a Coulomb blockade thermometer down to 2.8 mK

Test of the Wiedemann-Franz Law in an Optimally Doped Cuprate

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