Soft mode characteristics of up-up-down-down spin chains: The role of exchange interactions on lattice dynamics

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4918767· OSTI ID:22410117

Guo, Y. J. ^[1]; Gao, Y. J.; Ge, C. N ^[1]; Guo, Y. Y. ^[2]; Yan, Z. B.

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1. School of Physics and Electronic Engineering, Jiangsu Second Normal University, Nanjing 210013 (China)
2. College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003 (China)

In this work, the dynamics of a diatomic chain is investigated with ↑↑↓↓ spin order in which the dispersion relation characterizes the effect of magnetic interactions on the lattice dynamics. The optical or acoustic mode softening in the center or boundary of the Brillouin zone can be observed, indicating the transitions of ferroelectric state, antiferromagnetic state, or ferroelastic state. The coexistence of the multiferroic orders related to the ↑↑↓↓ spin order represents a type of intrinsic multiferroic with strong ferroelectric order and different microscopic mechanisms.

• OSTI ID: 22410117
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BRILLOUIN ZONES
DISPERSION RELATIONS
EXCHANGE INTERACTIONS
FERROELECTRIC MATERIALS
PHASE TRANSFORMATIONS
SPIN