Strong spin-lattice coupling in tetragonal-like BiFeO3 films with thermal expansion anomalies

Xu, Zedong1; Deng, Bei1; Hu, Sixia2; Chen, Lang1

2020-09-21

10.1063/5.0014767

APPLIED PHYSICS LETTERS   影响因子和分区

0003-6951

1077-3118

The evidence for a spin-lattice coupling in a tetragonal-like BiFeO3 (BFO) film is derived from thermal expansion measurements. Taking the advantage of La doping, the Neel temperature (T-N) of the BFO film can be further adjusted over a broad range of temperatures. The lattice parameters exhibit anomalies near the Neel temperatures. The Bi0.8La0.2FeO3 film has a spin order-to-disorder transition at the T-N without a structural phase transition, suggesting that a spin-lattice coupling drives the thermal expansion anomalies. The spin-lattice coupling can be enhanced by the coexistence of phases in the thicker BFO films. The density functional theory calculations show a smaller lattice constant of the c axis in the spin-order state than that in the spin-disorder state for the same tetragonal-like phase, which supports that the thermal expansion anomalies are a consequence of the spin-lattice coupling. Our findings may have application prospects for functional materials with controllable thermal expansions.

SCI ; EI

英语

NI期刊

第一 ; 通讯

National Natural Science Foundation of China[61601217][51972160] ; Science and Technology Research Items of Shenzhen[JCYJ20170412153325679][JCYJ20180504165650580] ; SUSTech High-level Special Funding[G02206303][G02206403]

Physics

Physics, Applied

WOS:000576358900001

AMER INST PHYSICS

20204109336055

Iron compounds ; Lanthanum compounds ; Semiconductor doping ; Density functional theory ; Functional materials ; Bismuth compounds ; Lattice theory ; Negative thermal expansion

Thermodynamics:641.1 ; Semiconducting Materials:712.1 ; Probability Theory:922.1 ; Mathematical Statistics:922.2 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4 ; Materials Science:951

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Mat Characterizat & Preparat Ctr, Shenzhen 518055, Peoples R China

Xu, Zedong,Deng, Bei,Hu, Sixia,et al. Strong spin-lattice coupling in tetragonal-like BiFeO3 films with thermal expansion anomalies[J]. APPLIED PHYSICS LETTERS,2020,117(12).

Xu, Zedong,Deng, Bei,Hu, Sixia,&Chen, Lang.(2020).Strong spin-lattice coupling in tetragonal-like BiFeO3 films with thermal expansion anomalies.APPLIED PHYSICS LETTERS,117(12).

Xu, Zedong,et al."Strong spin-lattice coupling in tetragonal-like BiFeO3 films with thermal expansion anomalies".APPLIED PHYSICS LETTERS 117.12(2020).