Thermodynamics of the ferromagnetic phase transition in nearly half metallic CoS2 at high pressures

Journal Article · Fri Dec 06 00:00:00 EST 2013 · Solid State Communications

DOI:https://doi.org/10.1016/j.ssc.2013.12.001· OSTI ID:1139961

Elkin, F. S. ^[1]; Zibrov, I. P. ^[1]; Novikov, A. P. ^[1]; Khasanov, S. S. ^[2]; Sidorov, V. A. ^[1]; Petrova, A. E. ^[1]; Lograsso, Thomas A. ^[3]; Thompson, J. D. ^[4]; Stishov, S. M. ^[1]

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1. Institute for High Pressure Physics of Russian Academy of Sciences
2. Institute for Solid State Physics Russian Academy of Sciences
3. Ames Laboratory
4. Los Alamos National Laboratory

The volume change and heat capacity at the ferromagnetic phase transition in COS2 were measured at high pressures using X-rays generated by the Argonne synchrotron light source and by ac-calorimetry, respectively. The transition entropy, calculated on the basis of these experimental data, drops along the transition line due to quantum degradation, as required by Nernst's law. The volume change increases strongly along the transition line, which is explained by specifics of the compressibility difference of coexisting phases that results from nearly half metallic nature of the ferromagnetic phase of COS2. (C) 2013 Elsevier Ltd. All rights reserved.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 1139961
• Report Number(s): IS-J 8274
• Journal Information: Solid State Communications, Vol. 181; ISSN 0038-1098
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRICAL-RESISTIVITY
Half-metal
phase transition
pyrite structure
specific heat
x-ray