Volume 125, Number 5, March 2019
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||15 April 2019|
Lattice effect on charge and magnetic ordering in La1/3 Sr2/3 FeO3−δ investigated by mechanical spectroscopy
1 National Laboratory of Solid State Microstructures and School of Physics, Nanjing University Nanjing 210093, China
2 Collaborative Innovation Center of Advanced Microstructures - Nanjing 210093, China
Received: 5 December 2018
Accepted: 15 February 2019
We present an investigation on high-temperature tilting transition and low-temperature charge and magnetic ordering in La1/3 Sr2/3 FeO3−δ by mechanical spectroscopy. An octahedral tilting transition appears around 500 K showing up as a huge modulus softening with the decrease in temperature in nearly oxygen stoichiometric La1/3 Sr2/3 FeO3−δ. The modulus softening is mainly due to ferroelastic domain wall motion in rhombohedral structure. A modulus hardening appears at the charge and magnetic ordering. It is expected that the charge and magnetic ordering partially pins the ferroelastic domain walls in La1/3 Sr2/3 FeO3−δ. This proposal was further investigated in a slight oxygen nonstoichiometric La1/3 Sr2/3 FeO3−δ sample and different high-temperature annealed La1/3 Sr2/3 FeO3−δ samples. Our work suggests a special magnetoelastic coupling, the pinning of ferroelastic domain walls by magnetic interaction in La1/3 Sr2/3 FeO3−δ.
PACS: 62.40.+i – Anelasticity, internal friction, stress relaxation, and mechanical resonances / 71.30.+h – Metal-insulator transitions and other electronic transitions / 81.40.Jj – Elasticity and anelasticity, stress-strain relations
© EPLA, 2019
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