A New Type of Carbon Resistance Thermometer with Excellent Thermal Contact at Millikelvin Temperatures

Samkharadze, Nodar; Kumar, Ashwani; Csáthy, Gábor

doi:10.1007/s10909-010-0192-5

Cited by 14 publications

(14 citation statements)

References 19 publications

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“…13 For thermometry down to the 5 mK base temperature of our dilution refrigerator we choose to measure the strongly temperature dependent viscosity of the He-3 liquid that, together with our sample to be measured, is enclosed in the immersion cell. According to the Fermi liquid theory the viscosity of He-3 obeys the simple equation ηT 2 = constant in the strongly degenerate limit, i.e., below about 30 mK.…”

Section: Thermometry Based On Quartz Tuning Fork Viscometrymentioning

confidence: 99%

“…This is useful since cooling electrons in resistive thermometers encounters the same problems as cooling electrons in nanostructures. 13 We considered two thermometers: a carbon-based thermometer described in Ref. 13 and a RuO thermometer.…”

Section: Characterizing the Electromagnetic Environment Of The Samentioning

confidence: 99%

“…13 We considered two thermometers: a carbon-based thermometer described in Ref. 13 and a RuO thermometer. 28 The carbon resistor was thinned down by removing its phenolic protection for short response times.…”

Section: Characterizing the Electromagnetic Environment Of The Samentioning

confidence: 99%

See 2 more Smart Citations

Integrated electronic transport and thermometry at milliKelvin temperatures and in strong magnetic fields

Samkharadze¹,

Kumar²,

Manfra³

et al. 2011

Review of Scientific Instruments

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We fabricated a He-3 immersion cell for transport measurements of semiconductor nanostructures at ultra low temperatures and in strong magnetic fields. We have a new scheme of field-independent thermometry based on quartz tuning fork Helium-3 viscometry which monitors the local temperature of the sample's environment in real time. The operation and measurement circuitry of the quartz viscometer is described in detail. We provide evidence that the temperature of two-dimensional electron gas confined to a GaAs quantum well follows the temperature of the quartz viscometer down to 4 mK.

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Section: Thermometry Based On Quartz Tuning Fork Viscometrymentioning

confidence: 99%

Section: Characterizing the Electromagnetic Environment Of The Samentioning

confidence: 99%

See 1 more Smart Citation

Integrated electronic transport and thermometry at milliKelvin temperatures and in strong magnetic fields

Samkharadze¹,

Kumar²,

Manfra³

et al. 2011

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…In order to achieve low charge carrier temperature the sample has been soldered onto eight sintered silver heat exchangers which were immersed into a liquid He-3 bath [14]. The temperature of the bath is inferred from the temperature dependent viscosity of the He-3 which is measured using a quartz tuning fork viscometer [35]. Figure 1 shows an overview of the longitudinal magnetoresistance R xx and Hall resistance R xy for 2 < ν < 3.…”

mentioning

confidence: 99%

Nonconventional Odd-Denominator Fractional Quantum Hall States in the Second Landau Level

et al. 2010

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We report the observation of a new fractional quantum Hall state in the second Landau level of a two-dimensional electron gas at the Landau level filling factor ν=2+6/13. We find that the model of noninteracting composite fermions can explain the magnitude of gaps of the prominent 2+1/3 and 2+2/3 states. The same model fails, however, to account for the gaps of the 2+2/5 and the newly observed 2+6/13 states suggesting that these two states are of exotic origin.

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“…Two resistors mounted to the back side of the chip carrier were used for rapid control of the sample temperature: a metal film resistor ("local heater") was for heating, while a nearby carbon resistor ("local thermometer") monitored the temperature. 7 The sample was cooled in a dilution refrigerator with a base temperature around 15 mK, a process that took 6 hours to 4.2 K and an additional 6 hours to base temperature. The same chip was cooled down from room temperature four times, with essentially identical results.…”

mentioning

confidence: 99%

Low-temperature illumination and annealing of ultrahigh quality quantum wells

et al. 2014

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The effects of low temperature illumination and annealing on fractional quantum Hall (FQH) characteristics of a GaAs/AlGaAs quantum well are investigated. Illumination alone, below 1 K, decreases the density of the 2DEG electrons by more than an order of magnitude and resets the sample to a repeatable initial state. Subsequent thermal annealing at a few Kelvin restores the original density and dramatically improves FQH characteristics. A reliable illumination and annealing recipe is developed that yields an energy gap of 600 mK for the 5/2 state.

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A New Type of Carbon Resistance Thermometer with Excellent Thermal Contact at Millikelvin Temperatures

Cited by 14 publications

References 19 publications

Integrated electronic transport and thermometry at milliKelvin temperatures and in strong magnetic fields

Integrated electronic transport and thermometry at milliKelvin temperatures and in strong magnetic fields

Nonconventional Odd-Denominator Fractional Quantum Hall States in the Second Landau Level

Low-temperature illumination and annealing of ultrahigh quality quantum wells

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