TY - JOUR
T1 - Geometric-phase interference in a Mn12 single-molecule magnet with fourfold rotational symmetry
AU - Adams, S. T.
AU - da Silva Neto, Silva Neto, E. H.
AU - Datta, S.
AU - Ware, J. F.
AU - Lampropoulos, C.
AU - Christou, G.
AU - Myaesoedov, Y.
AU - Zeldov, Eli
AU - Friedman, Jonathan R.
N1 - National Science Foundation [DMR-1006519, DMR-0449516]; Amherst College Dean of Faculty; NSF [CNS-0521169]; George Norman Albree Trust; Howard Hughes Medical InstituteWe thank M. Bal, D. Garanin, and A. Garg for useful discussions, and acknowledge E. Maradzike, G. Gallo, R. Cann, and J. Kubasek for their design and technical contributions to this work. Support for this work was provided by the National Science Foundation under Grants No. DMR-1006519 and No. DMR-0449516 and by the Amherst College Dean of Faculty. Some of the numerical calculations presented were performed on the Amherst College Computing Cluster, funded under NSF Grant No. CNS-0521169. In addition, S. T. A. acknowledges the support of the George Norman Albree Trust and E. H. d. S. N. acknowledges the support of the Howard Hughes Medical Institute.
PY - 2013/2/20
Y1 - 2013/2/20
N2 - We study the magnetic relaxation rate Γ of the single-molecule magnet Mn12-tBuAc as a function of the magnetic field component H T transverse to the molecule's easy axis. When the spin is near a magnetic quantum tunneling resonance, we find that Γ increases abruptly at certain values of HT. These increases are observed just beyond values of HT at which a geometric-phase interference effect suppresses tunneling between two excited energy levels. The effect is washed out by rotating HT away from the spin's hard axis, thereby suppressing the interference effect. Detailed numerical calculations of Γ using the known spin Hamiltonian accurately reproduce the observed behavior. These results are the first experimental evidence for geometric-phase interference in a single-molecule magnet with true fourfold symmetry.
AB - We study the magnetic relaxation rate Γ of the single-molecule magnet Mn12-tBuAc as a function of the magnetic field component H T transverse to the molecule's easy axis. When the spin is near a magnetic quantum tunneling resonance, we find that Γ increases abruptly at certain values of HT. These increases are observed just beyond values of HT at which a geometric-phase interference effect suppresses tunneling between two excited energy levels. The effect is washed out by rotating HT away from the spin's hard axis, thereby suppressing the interference effect. Detailed numerical calculations of Γ using the known spin Hamiltonian accurately reproduce the observed behavior. These results are the first experimental evidence for geometric-phase interference in a single-molecule magnet with true fourfold symmetry.
UR - https://www.scopus.com/pages/publications/84874139769
U2 - 10.1103/PhysRevLett.110.087205
DO - 10.1103/PhysRevLett.110.087205
M3 - مقالة
SN - 0031-9007
VL - 110
JO - Physical review letters
JF - Physical review letters
IS - 8
M1 - 087205
ER -