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Competing Spin Phases in Geometrically Frustrated Magnetic Molecules | | C. Schroeder
; H. Nojiri
; J. Schnack
; P. Hage
; M. Luban
; P. Koegerler
; | | Date: |
18 May 2004 | | Subject: | Materials Science | cond-mat.mtrl-sci | | Abstract: | 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. | | Source: | arXiv, cond-mat/0405405 | | Other source: | [GID 97591] pmid15698128 | | Services: | Forum | Review | PDF | Favorites | |
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