Excitations in spin chains and specific-heat anomalies in Yb4As3
Physik komplexer Systeme - D-01187 Dresden, Germany
Accepted: 23 May 1996
An explanation is given for the observed magnetic-field dependence of the low-temperature specific-heat coefficient of . It is based on a recently developed model for that material which can explain the observed heavy-fermion behaviour. According to it, the ions are positioned in a net of parallel chains with an effective spin coupling of the order of . The magnetic-field dependence can be understood by including a weak magnetic coupling J' between adjacent chains. The data require a ratio . In that case the experimental results can be reproduced very well by the theory.
PACS: 71.27.+a – Strongly correlated electron systems / 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions / 75.30.Ds – Spin waves
© EDP Sciences, 1996