Roles of Bond Alternation in Magnetic Phase Diagram of RMnO3
Nobuo Furukawa, Masahito Mochizuki
TL;DR
This paper investigates how bond alternation influences the magnetic phase diagram of RMnO3, revealing the emergence of complex magnetic structures and ferroelectricity through analytical and numerical methods.
Contribution
It introduces a comprehensive study of bond alternation effects on magnetic phases in RMnO3 using a Heisenberg J1-J2 model with analytical and numerical analysis.
Findings
Reproduces magnetic phase diagram with incommensurate and commensurate states
Shows E-type magnetic structure and ferroelectricity emerge cooperatively
Highlights importance of magnetoelastic couplings in phase stabilization
Abstract
In order to investigate nature of the antiferromagnetic structures in perovskite RMnO3, we study a Heisenberg J1-J2 model with bond alternation using analytical and numerical approaches. The magnetic phase diagram which includes incommensurate spiral states and commensurate collinear states is reproduced. We discuss that the magnetic structure with up-up-down-down spin configuration (E-type structure) and the ferroelectricity emerge cooperatively to stabilize this phase. Magnetoelastic couplings are crucial to understand the magnetic and electric phase diagram of RMnO3.
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