Multiple phase transitions in single-crystalline Na$_{1-δ}$FeAs

Details Multiple phase transitions in single-crystalline Na$_{1-δ}$FeAs Multiple phase transitions in single-crystalline Na$_{1-δ}$FeAs

2009-02-06

arxiv.org/abs/0902.1100v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

Specific heat, resistivity, susceptibility and Hall coefficient measurements were performed on high-quality single crystalline Na$_{1-\delta}$FeAs. This compound is found to undergo three successive phase transitions at around 52, 41, and 23 K, which correspond to structural, magnetic and superconducting transitions, respectively. The Hall effect result indicates the development of energy gap at low temperature due to the occurrence of spin-density-wave instability. Our results provide direct experimental evidence of the magnetic ordering in the nearly stoichiometric NaFeAs.

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