A Pulsed NMR System for Nuclear Thermometry Below 2 K

Aalto, M.I.; Collan, H.; Gylling, R.G.; Nores, K. O.

doi:10.1063/1.1686305

Cited by 35 publications

(3 citation statements)

References 11 publications

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“…Ahonen et al 6 used as a primary reference a pulsed NMR platinum powder thermometer developed by Aalto et al 47 The platinum susceptibility was self-calibrated using T1 measurements and Korringa's relation Table IV. For the melting pressures of the features A, B, and S they find values that are higher than those given in Section 2.4 by a practically constant amount of 5.7 mbar.…”

Section: Determination Of the A-transition Temperaturementioning

confidence: 99%

Properties of melting 3He: Specific heat, entropy, latent heat, and temperature

et al. 1978

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A sequence of experiments has been performed to measure thermal properties of liquid and solid 3He between the temp3eratures 1 and 25 mK at melting curve densities. A two-phase mixture of 'He sample was self-cooled by the Pomeranchuk method. A heat pulse technique was used, combined with measurements of pressure and volume, to yield separate determinations of liquid and solid properties: the specific heat of liquid 3He in the normal Fermi liquid and superfluid phases; the entropy of solid 3He above and through a nuclear magnetic transition at 1.10inK; and an absolute thermodynamic temperature scale based on measurement of latent heat of conversion of liquid to solid.

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Section: Determination Of the A-transition Temperaturementioning

confidence: 99%

Properties of melting 3He: Specific heat, entropy, latent heat, and temperature

et al. 1978

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“…Therefore, a tradeoff between the signal amplitude and the heating effect should be achieved. The radio-frequency field of the tipping pulse also introduces eddy-current heating and increases the electron temperature, [14,15] which should be carefully considered and minimized. Moreover, small samples should always be used, not only to keep the eddy-current heating small but also to make the electromagnetic field fully penetrate the sample.…”

Section: Thermometry In Millikelvin and Sub-mk Temperature Rangesmentioning

confidence: 99%

Sub-millikelvin station at Synergetic Extreme Condition User Facility

et al. 2018

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The Institute of Physics, Chinese Academy of Sciences, is in charge of the construction of the Synergetic Extreme Condition User Facility (SECUF) in Huairou, Beijing. The SECUF is a comprehensive facility focused on providing extreme physical conditions for scientific research, including an ultralow temperature, ultrahigh pressure, ultrahigh magnetic field, and ultrafast laser. The ultralow temperature will be realized by the sub-millikelvin (sub-mK) station, whose main component is an adiabatic nuclear demagnetization refrigerator (ANDR). The refrigerator is designed to have a base temperature below 1 mK and a magnetic field up to 16 T for experiments, as well as a characteristic parameter of B/T 10 4 T/K. In this review, we introduce adiabatic nuclear demagnetization refrigeration, thermometry from 10 mK to sub-mK, the properties and parameters of the ANDR of the SECUF, and related prospective research topics.

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“…Only pulsed NMR, with subsequent detection of the free induction decay, gained practical importance because its signals depend on the population before the application of the stimulating pulse. Among several possible materials, platinum is generally preferred (Aalto et al 1973, Hechtfischer and Schuster 2003b) because of its relatively short thermal relaxation time (1 s at 30 mK), long spin relaxation time (time constant 1 ms) and the existence of only one active isotope of spin 1/2 ( 195 Pt). In order to avoid heating by the stimulating pulse, its frequency is kept low (a few hundred kilohertz), and the sample itself is made of powder or fine wires.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

Temperature metrology

Fischer¹,

Fellmuth²

2005

Rep. Prog. Phys.

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The majority of the processes used by the manufacturing industry depend upon the accurate measurement and control of temperature. Thermal metrology is also a key factor affecting the efficiency and environmental impact of many high-energy industrial processes, the development of innovative products and the health and safety of the general population. Applications range from the processing, storage and shipment of perishable foodstuffs and biological materials to the development of more efficient and less environmentally polluting combustion processes for steel-making. Accurate measurement and control of temperature is, for instance, also important in areas such as the characterization of new materials used in the automotive, aerospace and semiconductor industries.This paper reviews the current status of temperature metrology. It starts with the determination of thermodynamic temperatures required on principle because temperature is an intensive quantity. Methods to determine thermodynamic temperatures are reviewed in detail to introduce the underlying physical basis. As these methods cannot usually be applied for practical measurements the need for a practical temperature scale for day-to-day work is motivated. The International Temperature Scale of 1990 and the Provisional Low Temperature Scale PLTS-2000 are described as important parts of the International System of Units to support science and technology. Its main importance becomes obvious in connection with industrial development and international markets. Every country is strongly interested in unique measures, in order to guarantee quality, reproducibility and functionability of products. The eventual realization of an international system, however, is only possible within the well-functioning organization of metrological laboratories. In developed countries the government established scientific institutes have certain metrological duties, as, for instance, the maintenance and dissemination of national units. For the base unit kelvin, this procedure is described in the sections on practical temperature scales, practical thermometry and reference standards.* Dedicated to the occasion of the 60th birthday of Wolfgang Buck.

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A Pulsed NMR System for Nuclear Thermometry Below 2 K

Cited by 35 publications

References 11 publications

Properties of melting 3He: Specific heat, entropy, latent heat, and temperature

Properties of melting 3He: Specific heat, entropy, latent heat, and temperature

Sub-millikelvin station at Synergetic Extreme Condition User Facility

Temperature metrology

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