Low-energy magnetic excitations of the Mn12-acetate spin cluster observed by neutron scattering

被引：211

作者：

Mirebeau, I ^{[1
]}

Hennion, M

Casalta, H

Andres, H

Güdel, HU

Irodova, AV

Caneschi, A

机构：

[1] Ctr Etud Saclay, CEA, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[3] Univ Bern, Dept Chem, CH-3000 Bern, Switzerland

[4] IV Kurchatov Atom Energy Inst, Russian Res Ctr, Moscow 123182, Russia

[5] Univ Florence, Dept Chem, I-50144 Florence, Italy

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.83.628

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We studied Mn-12-acetate by inelastic neutron scattering and diffraction. We separated the energy levels corresponding to the splitting of the lowest S multiplet (S = 10 ground state). The irregular spacing of the transition energies unambiguously shows the presence of high-order terms in the spin Hamiltonian [D = -0.457(2) cm(-1), B-4(0) = -2.33(4) x 10(-5) cm(-1)]. The relative intensity of the lowest energy peaks is very sensitive to the small transverse term that is responsible for quantum tunneling, providing the first determination of this term in zero magnetic field [B-4(4) = +/-3.0(5) x 10(-5) cm(-1)].

引用

页码：628 / 631

页数：4

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