title: Premartensitic transition and relevant magnetic effects in Ni50Mn34In15.5Al0.5 alloy.
abstract: Resistance measurement, in situ optical microscopic observation, thermal and magnetic measurements have been carried out on Ni50Mn34In15.5Al0.5 alloy. The existence of a pronounced premartensitic transition prior to martensitic transition can be characterized by microstructure evolution as well as exothermic peak and smooth decrease of resistance and magnetization with obvious hysteresis over a wide temperature range upon cooling. Consequently, the alloy undergoes two successive magneto-structural transitions consisting of premartensitic and martensitic transitions. Magnetoelastic coupling between magnetic and structural degrees of freedom would be responsible for the appearance of premartensitic transition, as evinced by the distinct shift of transitions temperatures to lower temperature with external applied field of 50 kOe. The inverse premartensitic transition induced by magnetic field results in large magnetoresistance, and contributes to the enhanced inverse magnetocaloric effect through enlarging the peak value and temperature interval of magnetic entropy change ΔSm.
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Yuqin
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Shaopu
authors.initials: S
authors.lastname: Guo
authors.affiliation: School of Physics, Shandong University, Jinan 250100, People's Republic of China.
authors.forename: Shuyun
authors.initials: S
authors.lastname: Yu
authors.affiliation: Wuhan National High Magnetic Field Center &School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Cheng
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.|Wuhan National High Magnetic Field Center &School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Ruilong
authors.initials: R
authors.lastname: Wang
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Xiao
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Lingfang
authors.initials: L
authors.lastname: Xu
authors.affiliation: School of Physics and Technology, Wuhan University, Wuhan, 430072, People's Republic of China.
authors.forename: Rui
authors.initials: R
authors.lastname: Xiong
authors.affiliation: School of Physics and Technology, Wuhan University, Wuhan, 430072, People's Republic of China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Wuhan National High Magnetic Field Center &School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: Zhengcai
authors.initials: Z
authors.lastname: Xia
authors.affiliation: Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro &Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People's Republic of China.
authors.forename: Changping
authors.initials: C
authors.lastname: Yang