期刊
PHYSICAL REVIEW B
卷 80, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.054407
关键词
antiferromagnetic materials; high-temperature superconductors; iron compounds; magnetic hysteresis; magnetic superconductors; magnetic transition temperature; neutron diffraction; order-disorder transformations; remanence; strontium compounds; superconducting transition temperature
资金
- U.S. Department of Energy [DE-AC02-07CH11358]
A detailed elastic neutron scattering study of the structural and magnetic phase transitions in single-crystal SrFe2As2 reveals that the orthorhombic (O)-tetragonal (T) and the antiferromagnetic transitions coincide at T-O=T-N=(201.5 +/- 0.25) K. The observation of coexisting O-T phases over a finite temperature range at the transition and the sudden onset of the O distortion provide strong evidences that the structural transition is first order. The simultaneous appearance and disappearance within 0.5 K upon cooling and within 0.25 K upon warming, respectively, indicate that the magnetic and structural transitions are intimately coupled. We find that the hysteresis in the transition temperature extends over a 1-2 K range. Based on the observation of a remnant orthorhombic phase at temperatures higher than T-O, we suggest that the T-O transition may be an order-disorder transition.
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