期刊
PHYSICAL REVIEW B
卷 85, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.214414
关键词
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资金
- National Basic Research Program of China (973 Program) [2012CB922002, 2011CB00101]
- National Natural Science Foundation of China [11190021, 51021091]
- Ministry of Science and Technology of China
- Chinese Academy of Sciences
We report the magnetic and transport measurements of CaCo2As2 and Ca0.9Sr0.1Co2As2 single crystals. An antiferromagnetic transition was observed at about 70 K and 90 K for CaCo2As2 and Ca0.9Sr0.1Co2As2, respectively. Magnetic and magnetoresistance measurements reveal a metamagnetic transition from an antiferromagnetic state to a ferromagnetic state with a critical field of 3.5 and 1.5 T for these two samples, respectively along the c axis at low temperature. For the field applied along the ab plane, spins can be fully polarized above a field of 4.5 T for Ca0.9Sr0.1Co2As2. While for CaCo2As2, spins cannot be fully polarized up to 7 T. We propose the cobalt moments of these two materials should be ordered ferromagnetically within the ab plane but antiferromagnetically along the c axis (A-type antiferromagnetic).
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