Journal ArticleDOI
ac calorimeter for measurements of adsorbed gases on metal films at 4He temperatures
T. W. Kenny,P. L. Richards +1 more
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In this paper, an analysis of the performance of an ideal ac calorimeter limited only by thermodynamic noise is presented, which is designed for studies of the heat capacity of monolayers and multilayers of atoms and molecules adsorbed on a variety of surfaces.Abstract:
An analysis is presented of the performance of an ideal ac calorimeter limited only by thermodynamic noise. A calorimeter based on this analysis is described which is designed for studies of the heat capacity of monolayers and multilayers of atoms and molecules adsorbed on a variety of surfaces. The calorimeter consists of Ge:Ga thermometers and NiCr heaters mounted on one side of a sapphire substrate, with an evaporated film deposited on the other side. The calorimeter is mounted on a 4He cold finger in a UHV system allowing heat capacity measurements down to 1.6 K. In order to verify the performance of the calorimeter, measurements have been made of the heat capacity of 25‐μg samples of indium, and of submonolayer coverages of 4He on sapphire. The measured sensitivity corresponds to <10−2 monolayers of 4He adsorbed on the surface of the calorimeter in the gas phase.read more
Citations
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Journal ArticleDOI
Thin film microcalorimeter for heat capacity measurements from 1.5 to 800 K
D. W. Denlinger,E. N. Abarra,Kimberly Allen,P. W. Rooney,M. T. Messer,Susan K. Watson,Frances Hellman +6 more
TL;DR: In this paper, a microcalorimeter for measuring heat capacity of thin films in the range 1.5-800 K is described, using amorphous silicon nitride membrane as the sample substrate, a Pt thin film resistor for temperatures greater than 40 K, and either a thin film ammorphous Nb-Si or a boron-doped polycrystalline silicon thermometer for lower temperatures.
Journal ArticleDOI
Modulation calorimetry and related techniques
TL;DR: In this paper, various modulation techniques for measuring specific heat, thermal expansivity, temperature derivative of resistance, thermopower, and spectral absorptance are reviewed, due to the periodic nature of temperature oscillations, high sensitivity and excellent temperature resolution are peculiar to all these methods.
Journal ArticleDOI
Classical temperature-modulated calorimetry: A review
TL;DR: The application of temperature-modulated calorimetry is reviewed in this article, with a focus on temperature scanning and frequency-dependent heat capacity experiments, in view of measured dynamic specific heat.
Journal ArticleDOI
In situ investigation of vapor-deposited glasses of toluene and ethylbenzene via alternating current chip-nanocalorimetry.
TL;DR: The kinetic stability of the most stable toluene and ethylbenzene glasses is comparable to that observed for other stable glasses formed by vapor deposition, and the largest heat capacity decrease and the most kinetically stable glasses are observed in a range of deposition temperatures between 0.75 T( g) and 0.96 T(g).
Journal ArticleDOI
Differential alternating current chip calorimeter for in situ investigation of vapor-deposited thin films.
TL;DR: An ac chip calorimeter for in situ heat capacity measurements of as-deposited nanometer thin films of organic glass formers is described and sample thickness determination is based on a finite element modeling of the sensor sample arrangement.
References
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Book
Progress in Low Temperature Physics
TL;DR: In this article, the specific heat of high-T c superconductors was studied. But the authors focused on the scaling of 3 He-4 He mixtures and did not consider the properties of the order parameter collective modes of these mixtures.
Journal ArticleDOI
Dislocation-mediated melting in two dimensions
TL;DR: In this paper, a theory of dislocation-mediated melting in two dimensions is described in detail, with an emphasis on results for triangular lattices on both smooth and periodic substrates, and the behavior of the specific heat, structure factor, and various elastic constants near these transitions is worked out.
Journal ArticleDOI
Melting and the vector Coulomb gas in two dimensions
TL;DR: In this paper, the dislocation theory of two-dimensional melting due to Kosterlitz and Thouless is investigated for the triangular lattice, paying special attention to angular forces between dislocation pairs, which are equal in magnitude to the radial forces.
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Two-dimensional melting
TL;DR: A review of the current status of research into the problem of two-dimensional melting, with an emphasis on computer simulations, is given in this article, where an attempt is made to point out unresolved issues pertaining to this fascinating and still open question.
Journal ArticleDOI
Steady-State, ac-Temperature Calorimetry
Paul F. Sullivan,G. Seidel +1 more
TL;DR: In this article, a steady-state technique for measuring heat capacity using ac heating is described, where heat is applied sinusoidally in time to a sample coupled thermally to a reservoir; the resultant equilibrium temperature of the sample contains a term that is both inversely proportional to the heat capacity and measurable with high precision.