Low-energy spin excitations in the molecular magnetic cluster V15

被引：71

作者：

Chaboussant, G ^{[1
]}

Basler, R

Sieber, A

Ochsenbein, ST

Desmedt, A

Lechner, RE

Telling, MTF

Kögerler, P

Müller, A

Güdel, HU

机构：

[1] Univ Bern, Dept Chem & Biochem, CH-3000 Bern 9, Switzerland

[2] Hahn Meitner Inst Berlin GmbH, BENSC, D-14109 Berlin, Germany

[3] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[4] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[5] Univ Bielefeld, Fak Chem, D-33501 Bielefeld, Germany

来源：

EUROPHYSICS LETTERS | 2002年 / 59卷 / 02期

关键词：

D O I：

10.1209/epl/i2002-00240-x

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report an Inelastic Neutron Scattering (INS) study of the fully deuterated molecular compound K-6[V-15(IV) As6O42] . 9D(2)O(V-15). Due to geometrical frustration, the essential physics at low temperatures of the V 15 cluster containing 15 coupled V4+ (S = 1/2) is determined by three weakly coupled spin-(1/2) on a triangle. The INS spectra at low energy allow us to directly determine the effective exchange coupling J(0) = 0.211(2) meV within the triangle and the gap 2 = 0.035(2) meV between the two spin-(1/2) doublets of the ground state. Results are discussed in terms of deviations from trigonal symmetry and Dzyaloshinskii-Moriya (DM) interactions.

引用

页码：291 / 297

页数：7

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