title: Application of strain to orbital-spin-coupled system MnV2O4 at cryogenic temperatures within a transmission electron microscope.
abstract: The impact of mechanical stress on the morphology of crystallographic and magnetic domains in shape-controlled specimens of an orbital-spin-coupled system, MnV2O4, was examined by cryogenic Lorentz microscopy. Because of the difference in thermal expansion coefficients of MnV2O4 and the supporting Mo mesh, compression on the order of 0.01% was applied to the thin-foil specimens near the structural/magnetic phase transformation temperatures. The extent of compression was comparable to the lattice striction associated with the cubic-to-tetragonal phase transformation in MnV2O4 The applied strain thus clearly influenced the morphology of crystallographic domains (i.e. twinning configuration in the tetragonal phase) produced during cooling. The magnetic domain structure was entirely dependent on the configuration of twinning in the tetragonal phase. The observations in this study provided useful information for understanding the relationship between the crystallographic domains and the magnetic domains in MnV2O4.
authors.affiliation: The Ultramicroscopy Research Center, Kyushu University, Fukuoka 819-0395, Japan Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka 819-0395, Japan RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan murakami@nucl.kyushu-u.ac.jp.
authors.forename: Y
authors.initials: Y
authors.lastname: Murakami
authors.affiliation: JEOL Ltd., Akishima 196-8558, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.affiliation: Department of Basic Science, The University of Tokyo, Tokyo 153-8902, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nii
authors.affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Murai
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Arima
authors.affiliation: Department of Materials Science, Tohoku University, Sendai 980-8579, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Kainuma
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Shindo
keywords: Lorentz microscopy; in situ TEM observation; magnetic domains; phase transformations; strongly correlated electron systems; twin