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

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2014-03-01
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Elkin, F.
Zibrov, I.
Novikov, A.
Khasanov, S.
Sidorov, V.
Petrova, A.
Thompson, J.
Stishov, S.
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Lograsso, Thomas
Ames Laboratory Division Director
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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Materials Science and Engineering

The Department of Materials Science and Engineering teaches the composition, microstructure, and processing of materials as well as their properties, uses, and performance. These fields of research utilize technologies in metals, ceramics, polymers, composites, and electronic materials.

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The Department of Materials Science and Engineering was formed in 1975 from the merger of the Department of Ceramics Engineering and the Department of Metallurgical Engineering.

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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.

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This is a manuscript of the article published as Elkin, F. S., I. P. Zibrov, A. P. Novikov, S. S. Khasanov, V. A. Sidorov, A. E. Petrova, Thomas A. Lograsso, J. D. Thompson, and S. M. Stishov. "Thermodynamics of the ferromagnetic phase transition in nearly half metallic CoS2 at high pressures." Solid State Communications 181 (2014): 41-45. DOI: 10.1016/j.ssc.2013.12.001. Posted with permission.

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Tue Jan 01 00:00:00 UTC 2013
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