Quantum oscillations of the total spin in a heterometallic antiferromagnetic ring: Evidence from neutron spectroscopy

被引：87

作者：

Carretta, S. ^{[1
]}

Santini, P.

Amoretti, G.

Guidi, T.

Copley, J. R. D.

Qiu, Y.

Caciuffo, R.

Timco, G.

Winpenny, R. E. P.

机构：

[1] Univ Parma, Dipartimento Fis, I-43100 Parma, Italy

[2] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Univ Politecn Marche, Dipartimento Fis, I-60131 Ancona, Italy

[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[5] European Comiss, JRC ITU, D-76125 Karlsruhe, Germany

[6] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 16期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.98.167401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using inelastic neutron scattering and applied fields up to 11.4 T, we have studied the spin dynamics of the Cr7Ni antiferromagnetic ring in the energy window 0.05-1.6 meV. We demonstrate that the external magnetic field induces an avoided crossing (anticrossing) between energy levels with different total-spin quantum numbers. This corresponds to quantum oscillations of the total spin of each molecule. The inelastic character of the observed excitation and the field dependence of its linewidth indicate that molecular spins oscillate coherently for a significant number of cycles. Precise signatures of the anticrossing are also found at higher energy, where measured and calculated spectra match very well.

引用

页数：4

共 20 条

[11]

Lovesey S.W., 1986, THEORY NEUTRON SCATT, V2

[12] Spin dynamics and tunneling of the Neel vector in the Fe10 magnetic wheel -: art. no. 184405 [J].