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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 SmFeAsO 1-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 ∼2 K 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

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Journal:
NEW JOURNAL OF PHYSICS
Volume:
11
Issue:
2
Pages:
025010-025010
Publication date:
2009-02-27
DOI:
EISSN:
1367-2630
ISSN:
1367-2630
URN:
uuid:3c8b5b8e-ef76-4f89-ad6a-e12c54776209
Source identifiers:
7232
Local pid:
pubs:7232
Language:
English

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