The essential role of magnetic frustration in the phase diagrams of doped cobaltites

2021/05/13 by Peter P. Orth, Daniel Phelan, Orth, Peter P. +11
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.2105.06402

openalex publication_date 2021/05/13 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28

Abstract

Doped perovskite cobaltites (e.g., La_1-xSr_xCoO₃) have been extensively studied for their spin-state physics, electronic inhomogeneity, and insulator-metal transitions. Ferromagnetically-interacting spin-state polarons emerge at low x in the phase diagram of these compounds, eventually yielding long-range ferromagnetism. The onset of long-range ferromagnetism (x ≈ 0.18) is substantially delayed relative to polaron percolation (x ≈ 0.05), however, generating a troubling inconsistency. Here, Monte-Carlo simulations of a disordered classical spin model are used to establish that previously ignored magnetic frustration is responsible for this effect, enabling faithful reproduction of the magnetic phase diagram.

Related

• Electronic and magnetic nano phase separation in cobaltates La_2-xSr_xCoO₄
• Magnetic Dynamics and Spin Freezing in the Ferromagnetic Phase of Ba-Doped Perovskite Cobaltites
• On the microscopic origin of the magneto-electronic phase separation in Sr doped LaCoO3
• A critical examination of magnetic states of La_0.5Ba_0.5CoO₃: non-Griffiths phase and interacting ferromagnetic-clusters
• Dynamical disorder of spin-induced Jahn-Teller orbitals with the insulator-metal transition in cobaltates