Journal
PHYSICAL REVIEW B
Volume 79, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.104427
Keywords
antiferromagnetic materials; calcium compounds; critical exponents; crystal structure; electrical resistivity; magnetic susceptibility; Neel temperature; specific heat; thermal conductivity; thermal expansion
Funding
- National Science Foundation [DMR-0504769, DMR-0072276]
- U. S. Department of Energy, Office of Basic Energy Sciences [DE-FG-06ER46269]
- Brazilian agency CNPq and the Research Corporation [201017/2005-9]
Ask authors/readers for more resources
Physical properties including magnetic susceptibility, room-temperature electrical resistivity, thermal conductivity, heat capacity, and thermal expansion are reported for high quality single-crystal samples of marokite CaMn2O4. We determined that CaMn2O4 is highly electrically insulating and exhibits long-range antiferromagnetic order below T-N=217.5 +/- 0.6 K with easy axis along a. Anisotropic thermal expansion, similar to that of crystallographically layered materials, is observed, suggesting that the crystal structure of CaMn2O4 is also assembled from previously undescribed layers. An extensive thermodynamic study of the antiferromagnetic transition was undertaken resulting in a heat-capacity critical exponent alpha=0.082 +/- 0.007 and calculated pressure derivative dT(N)/dP=5.154 +/- 0.174 K/GPa.
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