New two dimensional S=1/2 Heisenberg antiferromagnets: synthesis, structure and magnetic properties

Details New two dimensional S=1/2 Heisenberg antiferromagnets: synthesis, structure and magnetic properties New two dimensional S=1/2 Heisenberg antiferromagnets: synthesis, structure and magnetic properties

2001-07-23

arxiv.org/abs/cond-mat/0107483v3

Physics

Condensed Matter

Materials Science

20 pages, 10 Figures Updated Figures and minor corrections to text

Scientific paper

10.1103/PhysRevB.65.144412

The magnetic susceptibility and magnetization of two new layered S=1/2 Heisenberg antiferromagnets with moderate exchange are reported. The two isostructural compounds, (2-amino-5-chloropyridinium)2CuBr4 ((5CAP)2CuBr4) and (2-amino-5-methylpyridinium)2CuBr4 ((5MAP)2CuBr4), contain S=1/2, Cu(II) ions related by C-centering, yielding four equivalent nearest neighbors. The crystal structure of newly synthesized compound, (5CAP)2CuBr4, shows the existence of layers of distorted copper(II)-bromide tetrahedra parallel to the ab plane, separated by the organic cations along the c axis. Magnetic pathways are available through the bromide-bromide contacts within the layers and provide for moderate antiferromagnetic exchange. Susceptibility measurements indicate interaction strengths to be 8.5(1) K, and 6.5(1) K and ordering temperatures of 5.1(2) K and 3.8(2) K for (5CAP)2CuBr4 and (5MAP)2CuBr4 respectively. High field magnetization experiments on both compounds show upward curvature of M(H,T). Magnetization measurements made at T = 1.3 K show saturation occurs in (5MAP)2CuBr4 at 18.8 T and in (5CAP)2CuBr4 at 24.1 T. The magnetization curves are consistent with recent theoretical predictions. Single crystal magnetization measured at 2.0 K indicate a spin flop transition at 0.38 T and 0.63 T for (5CAP)2CuBr4 and (5MAP)2CuBr4 respectively.

Affiliated with

Also associated with

No associations

Rating

New two dimensional S=1/2 Heisenberg antiferromagnets: synthesis, structure and magnetic properties does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with New two dimensional S=1/2 Heisenberg antiferromagnets: synthesis, structure and magnetic properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New two dimensional S=1/2 Heisenberg antiferromagnets: synthesis, structure and magnetic properties will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-322144