Inelastic neutron scattering study of Mn{sub 12}{endash}acetate

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.369824· OSTI ID:347050

Zhong, Y; Sarachik, M P ^[1]; Friedman, J R ^[2]; Robinson, R A; Kelley, T M; Nakotte, H; Christianson, A C ^[3]; Trouw, F ^[4]; Aubin, S M; Hendrickson, D N ^[5]

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1. Physics Department, City College of the City University of New York, New York, New York 10031 (United States)
2. Department of Physics and Astronomy, The State University of New York at Stony Brook, Stony Brook, New York 11794 (United States)
3. Manuel Lujan Jr. Neutron Science Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
4. Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
5. Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093 (United States)

We report zero-field inelastic neutron scattering experiments on a deuterated powder sample of Mn{sub 12}{endash}acetate consisting of a large number of nominally identical spin-10 magnetic clusters. Our resolution enables us to see a series of peaks corresponding to transitions between the anisotropy levels within the spin-10 manifold. A fit to the spin Hamiltonian H={minus}DS{sub z}{sup 2}{minus}{mu}{sub B}{bold B{center_dot}g{center_dot}S}{minus}AS{sub z}{sup 4}+C(S{sub +}{sup 4}+S{sub {minus}}{sup 4}) yields an anisotropy constant D=(0.54{plus_minus}0.02)K and a fourth-order diagonal anisotropy coefficient A=(1.2{plus_minus}0.1){times}10{sup {minus}3}K (the other terms being negligible). Performed in the absence of a magnetic field, our experiments do not involve the {ital g} values as fitting parameters, thereby yielding particularly reliable values of {ital D} and {ital A}. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 347050
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 85; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ANISOTROPY
DEUTERATION
FERROMAGNETIC MATERIALS
HAMILTONIANS
INELASTIC SCATTERING
MANGANESE COMPOUNDS
NEUTRON DIFFRACTION
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS