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Research PapersNo Access

NONCOLLINEAR MAGNETIC ORDER IN THE DOUBLE PEROVSKITES: DOUBLE EXCHANGE ON A GEOMETRICALLY FRUSTRATED LATTICE

RAJARSHI TIWARI

Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad 211019, India

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and

PINAKI MAJUMDAR

Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad 211019, India

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https://doi.org/10.1142/S0217979213500185Cited by:2 (Source: Crossref)

Abstract

Double perovskites (DPs) of the form A₂BB′ O₆ usually involve a transition metal ion, B, with a large magnetic moment, and a nonmagnetic ion B′. While many DPs are ferromagnetic, studies on the underlying model reveal the possibility of antiferromagnetic (AF) phases as well driven by electron delocalization. In this paper we present a comprehensive study of the magnetic ground state and T_c scales of the minimal DP model in three dimensions using a combination of spin-fermion Monte Carlo and variational calculations. The effective magnetic lattice in three dimensions is face centered cubic (FCC) and so geometrically frustrated. This promotes noncollinear spiral states and "flux" like phases in addition to collinear AF order. We map out the possible magnetic phases for varying electron density, "level separation" ϵ_B - ϵ_B', and the crucial B′ B′ (next neighbour) hopping t′.

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Vol. 27, No. 06

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History

Received 9 September 2012

Revised 9 December 2012

Accepted 10 December 2012

Published: 30 January 2013

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