Possible unconventional superconductivity in iron-based layered compound LaFePO: Study of heat capacity

Details Possible unconventional superconductivity in iron-based layered compound LaFePO: Study of heat capacity Possible unconventional superconductivity in iron-based layered compound LaFePO: Study of heat capacity

2008-06-19

arxiv.org/abs/0806.3139v1

J. Phys. Soc. Jpn. 77 (2008) 094715

Physics

Condensed Matter

Materials Science

15 Pages, 3 Figures

Scientific paper

10.1143/JPSJ.77.094715

Heat capacity measurements were performed on recently discovered iron based layered superconductors, non doped LaFePO and fluorine doped LaFePO. A relatively large electronic heat capacity coefficient and a small normalized heat capacity jump at Tc = 3.3 K were observed in LaFePO. LaFePO0.94F0.06 had a smaller electronic heat capacity coefficient and a larger normalized heat capacity jump at Tc = 5.8 K. These values indicate that these compounds have strong electron electron correlation and magnetic spin fluctuation, which are the signatures of unconventional superconductivity mediated by spin fluctuation.

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