Anomalous percolation and quantum criticality in diluted rare-earth nickelates
Strongly Correlated Electrons
2009-11-10 v1 Superconductivity
Abstract
A microscopic model for the diluted spin-mixed compounds (R_xY_(1-x))_2BaNiO_5 (R=magnetic rare-earth) is studied using Quantum Monte Carlo (QMC). The ordering temperature is shown to be a universal function of the impurity concentration x and the intrinsic Ni-chain correlation length. An effective model for the critical modes is derived. The possibility of a quantum critical point driven by the rare earth-concentration and the existence of a Griffiths phase in the high dilution limit is investigated. Several possible experimental approaches to verify the results are put forward.
Keywords
Cite
@article{arxiv.cond-mat/0401167,
title = {Anomalous percolation and quantum criticality in diluted rare-earth nickelates},
author = {J. V. Alvarez and H. Rieger and A. Zheludev},
journal= {arXiv preprint arXiv:cond-mat/0401167},
year = {2009}
}
Comments
4 pages, 3 figures