Symmetry of magnetic quantum tunneling in single molecule magnet Mn12-acetate

E. Del Barco; A. D. Kent; E. M. Rumberger; D. N. Hendrickson; G. Christou

Symmetry of magnetic quantum tunneling in single molecule magnet Mn₁₂-acetate

E. Del Barco, A. D. Kent, E. M. Rumberger, D. N. Hendrickson, G. Christou

Research output: Contribution to journal › Article › peer-review

Abstract

The average fourfold symmetry of magnetic quantum tunneling (MQT) in Mn₁₂-acerate was studied and found to be due to equal populations of isomers with biaxial anisotropy that have orthogonal medium magnetic axes. Measurements of the tunneling probability versus transverse field showed evidence for Berry phase effects probably due to a combination of second and fourth order transverse magnetic anisotropies. The results illustrate how subtle changes in the molecule environment can modulate magnetic anisotropy and magnetic quantum tunneling.

Original language	English (US)
Article number	047203
Pages (from-to)	047203/1-047203/4
Journal	Physical Review Letters
Volume	91
Issue number	4
State	Published - Jul 25 2003

ASJC Scopus subject areas

Physics and Astronomy(all)

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abstract = "The average fourfold symmetry of magnetic quantum tunneling (MQT) in Mn12-acerate was studied and found to be due to equal populations of isomers with biaxial anisotropy that have orthogonal medium magnetic axes. Measurements of the tunneling probability versus transverse field showed evidence for Berry phase effects probably due to a combination of second and fourth order transverse magnetic anisotropies. The results illustrate how subtle changes in the molecule environment can modulate magnetic anisotropy and magnetic quantum tunneling.",

author = "{Del Barco}, E. and Kent, {A. D.} and Rumberger, {E. M.} and Hendrickson, {D. N.} and G. Christou",

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AU - Kent, A. D.

AU - Rumberger, E. M.

AU - Hendrickson, D. N.

AU - Christou, G.

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N2 - The average fourfold symmetry of magnetic quantum tunneling (MQT) in Mn12-acerate was studied and found to be due to equal populations of isomers with biaxial anisotropy that have orthogonal medium magnetic axes. Measurements of the tunneling probability versus transverse field showed evidence for Berry phase effects probably due to a combination of second and fourth order transverse magnetic anisotropies. The results illustrate how subtle changes in the molecule environment can modulate magnetic anisotropy and magnetic quantum tunneling.

AB - The average fourfold symmetry of magnetic quantum tunneling (MQT) in Mn12-acerate was studied and found to be due to equal populations of isomers with biaxial anisotropy that have orthogonal medium magnetic axes. Measurements of the tunneling probability versus transverse field showed evidence for Berry phase effects probably due to a combination of second and fourth order transverse magnetic anisotropies. The results illustrate how subtle changes in the molecule environment can modulate magnetic anisotropy and magnetic quantum tunneling.

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