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- Title
Construction of relaxation calorimetry for 10 μg samples and heat capacity measurements of organic complexes.
- Authors
Imajo, Shusaku; Fukuoka, Shuhei; Yamashita, Satoshi; Nakazawa, Yasuhiro
- Abstract
We report design and constructional details of a small-sized sample stage for relaxation calorimetry by utilizing commercially available ruthenium oxide chip sensors. The reduction in addenda heat capacity attained by fabrication of chip sensors made it possible to measure absolute values of the heat capacity of molecular compounds weighing in an order of 10 μg with better temperature resolution. The result of calibration of the system by measuring 54.0 μg metal indium which shows superconductive transition at 3.2 K is presented in the former part. Upon determining thermodynamic parameters of γ and β corresponding to the electronic heat capacity coefficient and the lattice heat capacity coefficient, respectively, we confirm that accurate measurements by such small amount of sample are possible. The magnitude of heat capacity jump is also discussed by comparing 0 T data and those under magnetic fields. Using this new calorimetry system, we then measured heat capacity of κ-type organic superconductive salts of κ-(BEDT-TTF)Cu(NCS) and κ-(BEDT-TTF)Cu[N(CN)]Br down to 0.7 K and discuss the nodal feature of the superconductive gap in them in the latter part. Measurements down to He temperature region with external magnetic fields will be possible for various organic conducting systems by a single piece of a crystal.
- Subjects
CALORIMETRY; HEAT capacity; ORGANIC compounds; METAL complexes; RUTHENIUM oxides; CHEMICAL detectors
- Publication
Journal of Thermal Analysis & Calorimetry, 2016, Vol 123, Issue 3, p1871
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-015-4885-5