Noise Thermometry with the Josephson Effect

Kamper, Robert A.; Zimmerman, J. E.

doi:10.1063/1.1659545

Cited by 135 publications

(49 citation statements)

References 10 publications

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“…The basic idea and the arrangement of the experiment are closely related to that of low-temperature noise thermometry, [35] where small voltage differences appearing across an ohmic resistor are converted by a SC loop with a weak link into Josephson's AC (RF) signal. The resistive behavior of B-NCD observed in the SC transition region ensures, namely, that the current flowing through the sample generates, in the array of weak links, a minute potential gradient and, consequently, oscillating Josephson's supercurrent.…”

Section: Measurement Of Current-induced Josephson Noisementioning

confidence: 99%

Quantum Transport in Boron‐Doped Nanocrystalline Diamond

Mareš

Hubík

Krištofik

et al. 2008

Chemical Vapor Deposition

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Highly grained thin films of boron-doped diamond are grown by plasma-enhanced (PE)CVD. Diamond nucleation surface treatment is discussed, together with its relation to the morphology, topology, and phase composition of the layers. The influence of the random incorporation of boron atoms in a diamond lattice is described in terms of Mott's metal and the weak localization (WL) transport mechanism. Starting from these concepts and from the experimental transport data, we build up a simple original theory of the superconductivity in boron-doped diamond that is based on a spinflip pairing mechanism. We analyze an influence of the grain boundaries in nanocrystalline diamond (NCD) on superconductivity-related quantum transport phenomena, and show a decisive role of the weak links created by point contacts between grains.

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Section: Measurement Of Current-induced Josephson Noisementioning

confidence: 99%

Quantum Transport in Boron‐Doped Nanocrystalline Diamond

Mareš

Hubík

Krištofik

et al. 2008

Chemical Vapor Deposition

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“…'_.if on T is the basis of the RSQUID noise thermometer. 2 An RSQUID so arranged that it may be used to measure heat current we shall call an RSqUID. An RSqUID may be regarded as a heat-current to frequency converter.…”

Section: The Thermal Rsquidmentioning

confidence: 99%

“…The heat capacity C,,, calculated from C., = n/(fl AT) (2) must be corrected for the addenda c, the contribution to 6",. due to parts other than the specimen, including part of the RSqUID itself.…”

Section: Introductionmentioning

confidence: 99%

Resistive SQUID calorimetry at low temperatures

Park

Vaidya

1980

J Low Temp Phys

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A resistive SQUID may be used to measure heatcurrent. We call an RSQUID used in such a way an RSqUID: It acts as a heat-current to frequency (q-f) converter of sensitivity fi = f/q. Two methods of heat capacity measurement by the use of an RSqUID are described. In the direct method the number of cycles of oscillation when the temperature of the RSqUID and specimen is changed by AT is counted. The measured heat capacity Cm (to be corrected for the addenda) is given by Cm = n/(fl AT). In the step method the specimen and heater together are separated from the RSq UID by a thermal resistance R. The RSq UID is biased to a frequency f l. The heater is switched on and a number of cycles is obtained which represents the amount of heat required to bring the specimen to equilibrium in the new steady state, in which f=fl +Sf. By this method the quantity Cm = n/(R6f) is obtained. In both methods the heat current is integrated by counting to obtain an amount of heat Q = n/fi, which may thus be measured very precisely if the number of cycles is sufficiently large (and fl(T) calibrated accurately]. The first RSqUID constructed for heat capacity measurement is described. In this RSqUID the high thermal resistance of press contacts has been avoided and soft solder as well as niobium used for superconducting material. The sensitivity fi varied from 0.8 to 0.4 Hz n W-between 2 and 7 K. The results of measurements made between 2 and 7K by the step method with this RSqUID in a rather unsophisticated cryostat achieved a relative accuracy of ~0.1% with samples of mass about 1 g. Results of measurements made on samples of pure copper and indium are described.

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“…Kamper and Zimmerman suggested that the subtlety of the Josephson effects could provide a true SQUID-based primary noise thermometer [97]. A Josephson junction is shunted by the low resistance R (in the range 1 lX to 1 mX), forming a resistive SQUID configuration.…”

Section: Magnetic Susceptibility Measurement For a Secondary Thermometermentioning

confidence: 99%