TY - JOUR
T1 - Experimental determination of the Weiss temperature of Mn12 -ac and Mn12 -ac-MeOH
AU - Li, Shiqi
AU - Bo, Lin
AU - Wen, Bo
AU - Sarachik, M. P.
AU - Subedi, P.
AU - Kent, A. D.
AU - Yeshurun, Y.
AU - Millis, A. J.
AU - Lampropoulos, C.
AU - Mukherjee, S.
AU - Christou, G.
PY - 2010/11/3
Y1 - 2010/11/3
N2 - We report measurements of the susceptibility in the temperature range from 3.5 to 6.0 K of a series of Mn12 -ac and Mn12 -ac-MeOH samples in the shape of rectangular prisms of length lc and square cross section of side la. The susceptibility obeys a Curie-Weiss law, χ=C/ (T-θ), where θ varies systematically with sample aspect ratio. Using published demagnetization factors, we obtain θ for an infinitely long sample corresponding to intrinsic ordering temperatures T c ≈0.85K and ≈0.74 K for Mn12 -ac and Mn 12 -ac-MeOH, respectively. The difference in Tc for two materials that have nearly identical unit cell volumes and lattice constant ratios suggests that, in addition to dipolar interactions, there is a nondipolar (exchange) contribution to the Weiss temperature that differs in the two materials because of the difference in ligand molecules.
AB - We report measurements of the susceptibility in the temperature range from 3.5 to 6.0 K of a series of Mn12 -ac and Mn12 -ac-MeOH samples in the shape of rectangular prisms of length lc and square cross section of side la. The susceptibility obeys a Curie-Weiss law, χ=C/ (T-θ), where θ varies systematically with sample aspect ratio. Using published demagnetization factors, we obtain θ for an infinitely long sample corresponding to intrinsic ordering temperatures T c ≈0.85K and ≈0.74 K for Mn12 -ac and Mn 12 -ac-MeOH, respectively. The difference in Tc for two materials that have nearly identical unit cell volumes and lattice constant ratios suggests that, in addition to dipolar interactions, there is a nondipolar (exchange) contribution to the Weiss temperature that differs in the two materials because of the difference in ligand molecules.
UR - https://www.scopus.com/pages/publications/78649658373
U2 - 10.1103/PhysRevB.82.174405
DO - 10.1103/PhysRevB.82.174405
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:78649658373
SN - 1098-0121
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 17
M1 - 174405
ER -