Article,

Nanocalorimeter for high resolution measurements of low temperature heat capacities of thin films and single crystals

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Review of Scientific Instruments, 68 (11): 4191-4195 (1997)
DOI: 10.1063/1.1148366

Abstract

An innovative nanocalorimeter has been developed for measuring specific heats of thin films, multilayers (typical thickness: 1000 �) and single crystals (mass: 1 �g) in the temperature range of 1.5�20 K. The addenda of the device are as small as 3 nJ/K at 4 K (0.5 nJ/K at 1.5 K), thus samples with a heat capacity of the order of nJ/K at 4 K can be measured. Heat capacity differences as a function of temperature or an external magnetic field (5 T) were determined with a resolution of Delta C/C ~= 10�4. This way we have seen heat capacity variations of less than a pJ/K. We present as an example measurements on very small Mn12O12 acetate single crystals and a measurement of a thin superconducting Pb layer. In the latter measurement we could evidence via specific heat a finite size effect.

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