Physics – Condensed Matter – Materials Science
Scientific paper
2004-05-18
Phys. Rev. Lett. 94, 207203 (2005)
Physics
Condensed Matter
Materials Science
4 pages, 5 figures, to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.94.017205
We have found a class of zero-dimensional geometrically frustrated Heisenberg spin systems exhibiting anomalous behavior in an external magnetic field B similar to that occuring in geometrically frustrated planar antiferromagnetic lattices. Our calculations for both the classical and quantum isotropic Heisenberg models show the emergence of a pronounced minimum in the differential susceptibility dM/dB at B_sat/3 as the temperature T is raised from 0K for structures based on corner-sharing triangles, specifically the octahedron, cuboctahedron, and icosidodecahedron. Low temperature measurements of magnetization M versus B for the giant Keplerate magnetic molecule Mo72Fe30 (Fe(3+) ions with spin s=5/2 on the 30 vertices of an icosidodecahedron) are consistent with our calculational results. The minimum in dM/dB is due to the fact that for low temperatures when B is approx. B_sat/3 there exist two competing families of spin configurations of which one behaves magnetically 'stiff' leading to a reduction of the susceptibility.
Hage P.
Koegerler P.
Luban Marshall
Nojiri Hidekazu
Schnack Juergen
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