Spin dimers under staggered and random field in   Cu$_2$Fe$_2$Ge$_4$O$_{13}

T. Masuda; K. Kakurai; and A. Zheludev

arXiv:0909.2402·cond-mat.str-el·October 28, 2009

Spin dimers under staggered and random field in Cu$_2$Fe$_2$Ge$_4$O$_{13}

T. Masuda, K. Kakurai, and A. Zheludev

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TL;DR

This study investigates the effects of staggered and random magnetic fields on spin-1/2 dimers in Cu$_2$Fe$_2$Ge$_4$O$_{13}$ using inelastic neutron scattering, revealing Zeeman splitting and broadening of triplet excitations.

Contribution

First experimental identification of dimer dynamics under staggered and random fields in a coupled chain compound using neutron scattering.

Findings

01

Zeeman splitting of triplet states observed at low temperature.

02

Triplet excitation broadening increases with temperature.

03

Basic dimer dynamics under complex magnetic fields are characterized.

Abstract

We study $S = 1/2$ dimer excitation in a coupled chain and dimer compound Cu $_{2}$ Fe $_{2}$ Ge $_{4}$ O $_{13} b y in e l a s t i c n e u t r o n sc a tt er in g t ec hni q u e . T h e Z ee man s pl i t o f t h e d im er t r i pl e t b y a s t a g g er e df i e l d i so b ser v e d a tl o w t e m p er a t u r e . W i t h t h e in cr e a seo f t e m p er a t u r e t h ee f f ec t o f r an d o m f i e l d i s d e t ec t e d b y a d r a s t i c b r o a d e nin g o f t h e t r i pl e t e x c i t a t i o n . B a s i c d y nami cso f d im er in t h es t a g g er e d an d r an d o m f i e l d s a r ee x p er im e n t a l l y i d e n t i f i e d in C u$ _2 $F e$ _2 $G e$ _4 $O$ _{13}.

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Taxonomy

TopicsTheoretical and Computational Physics · Magneto-Optical Properties and Applications · High-pressure geophysics and materials