Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 20, Issue 42, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/42/422201
Keywords
-
Categories
Funding
- Nature Science Foundation of China
- Ministry of Science and Technology of China [2006CB601001]
- National Basic Research Program of China [2006CB922005]
Ask authors/readers for more resources
We report intrinsic transport and magnetic properties and their anisotropy in high-quality single-crystal CaFe2As2. The resistivity anisotropy (rho(c)/rho(ab)) is similar to 50, less than the 150 of BaFe2As2, which arises from the strong coupling along the c-axis due to an apparent contraction of about 0.13 nm compared to BaFe2As2. In sharp contrast to the case of parent compounds ROFeAs (R = rare earth) and MFe2As2 (M = Ba and Sr), spin-density-wave (SDW) ordering (or structural transition) leads to a steep increase of resistivity in CaFe2As2. Such a different resistivity response to SDW ordering is helpful to understand the role played by SDW ordering in Fe-based high-T-c superconductors. The susceptibility behavior is very similar to that observed in single-crystal BaFe2As2. A linear temperature-dependent susceptibility occurs above the SDW transition of about 165 K. Partial substitution of Na for Ca suppresses the SDW ordering (anomaly in resistivity) and induces superconductivity at similar to 20 K.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available