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Anomalous percolation and quantum criticality in diluted rare-earth nickelates | | J.V. Alvarez
; H. Rieger
; A. Zheludev
; | | Date: |
11 Dec 2003 | | Journal: | Phys. Rev. Lett. 93, 156401 (2004) | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | 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. | | Source: | arXiv, cond-mat/0401167 | | Services: | Forum | Review | PDF | Favorites | |
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