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Double-exchange driven ferromagnetic metal-paramagnetic insulator transition in Mn-doped CuO

Alessio Filippetti and Vincenzo Fiorentini
Phys. Rev. B 74, 220401(R) – Published 6 December 2006

Abstract

Employing ab initio self-interaction-corrected local-spin-density calculations, we explain the nature of the ferromagnetic, metallic phase of Mn-doped CuO (an antiferromagnetic insulator when undoped), and of its concurrent transitions to a paramagnetic, insulating phase. Mn-induced donor levels enable conduction through ferromagnetically aligned Mn centers and ferromagnetic CuO planes via double exchange. In the paramagnetic insulating phase, a polaron hopping mechanism consistent with the experiments is envisaged. Our results suggest the intriguing possibility of designing double-exchange driven ferromagnetic cuprates.

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  • Received 16 October 2006

DOI:https://doi.org/10.1103/PhysRevB.74.220401

©2006 American Physical Society

Authors & Affiliations

Alessio Filippetti and Vincenzo Fiorentini

  • Sardinian Laboratory for Computational Material Science and Dipartimento di Fisica, Università di Cagliari, I-09042 Monserrato (Ca), Italy

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Issue

Vol. 74, Iss. 22 — 1 December 2006

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