Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.227004
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Funding
- NSFC
- CAS
- 973 project of the MOST of China
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Specific heat, resistivity, susceptibility, and Hall coefficient measurements were performed on high-quality single-crystalline Na1-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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