The evanescence of ferromagnetic order in the Ce1-xYxNi0.8Pt0.2 dense Kondo system

P. Martínez Samper; A. Izquierdo; H. Suderow; J. Rodríguez Fernández; J. I. Espeso; F. G. Aliev; J. C. Gómez Sal; S. Vieira

doi:10.1140/epjb/e2002-00205-y

2021 Impact factor 1.398

Condensed Matter and Complex Systems

Eur. Phys. J. B 28, 103-109 (2002)
https://doi.org/10.1140/epjb/e2002-00205-y

The evanescence of ferromagnetic order in the Ce_1-xY_xNi_0.8Pt_0.2 dense Kondo system

P. Martínez Samper¹, A. Izquierdo¹, H. Suderow¹, J. Rodríguez Fernández², J. I. Espeso²^a, F. G. Aliev¹, J. C. Gómez Sal² and S. Vieira¹

¹ Dpto. Física Mat. Cond., C-III, Univ. Autónoma Madrid, 28049 Madrid, Spain
² CITIMAC, Universidad de Cantabria, 39005 Santander, Spain

Corresponding author: ^a espesoji@unican.es

Received: 26 March 2001
Revised: 29 May 2002
Published online: 9 July 2002

Abstract

The experimental study of the low temperature (down to 0.4 K) specific heat of the Kondo ferromagnet system Ce_1-xY_xNi_0.8Pt_0.2 is presented. Special attention has been paid to the Ce_0.8Y_0.2Ni_0.8Pt_0.2 composition, which is situated near the Zero Temperature Phase Transition. This compound presents a marked divergence of the specific heat at low temperatures, signature of a Non Fermi Liquid behaviour. Different frameworks which could account this behaviour are analysed, being the most plausible a “strong coupling” situation with disorder effects. The importance of these effects is discussed in the general scenario of the Non Fermi Liquid compounds considering the differences between “ligand” and “Kondo hole” systems.

PACS: 75.30.Mb – Valence fluctuation, Kondo lattice and heavy-fermion phenomena / 71.10.Hf – Non-Fermi-Liquid ground states, electron phase diagrams and phase transitions in model systems

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002