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Heat capacity measurements on FeAs-based compounds: a thermodynamic probe of electronic and magnetic states

Abstract:

We report heat capacity measurements of the pnictide materials SmFeAsO1−xFx , NdFeAsO, LaFeAsO1−xFx and LiFeAs. For SmFeAsO1−xFx ,with x close to 0.1, we use 3He measurements to demonstrate a transfer of entropy from the peak at TN to a previously unidentified ~ 2K feature, which grows with increasing doping. Our results on the Sm samples are compared with a similarly doped La sample to elucidate the crystal field levels of the Sm3+ ion at 0, 20 and 45 meV, which lead to a Schottky-like anoma...

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Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1088/1367-2630/11/2/025010

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Role:
Author
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Institution:
ISIS Muon Facility, Rutherford Appleton Laboratory, Didcot, UK
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Author
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Institution:
ISIS Muon Facility, Rutherford Appleton Laboratory, Didcot, UK
Role:
Author
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Institution:
University of Science and Technology of China, Hefei, People's Republic of China
Department:
Department of Physics
Role:
Author
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Institution:
University of Science and Technology of China, Hefei, People's Republic of China
Department:
Department of Physics
Role:
Author
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Contributors

Engineering and Physical Sciences Research Council More from this funder
Science and Technology Facilities Council More from this funder
Publisher:
Institute of Physics Publisher's website
Journal:
New Journal of Physics Journal website
Volume:
11
Article number:
025010
Publication date:
2009-02-01
DOI:
ISSN:
1367-2630
Language:
English
Keywords:
Subjects:
UUID:
uuid:89e54e85-c2f0-477e-af21-a96e423ea032
Local pid:
ora:2824
Deposit date:
2009-06-09

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