Enhancement of Curie temperature and transition temperature range induced by Al doping in Mn1-xAlxCoGe. (December 2016)

• Record Type: Journal Article
• Authors: Si, Xiaodong; Liu, Yongsheng; Lei, Wei; Xu, Juan; Du, Wenlong; Lin, Jia; Zhou, Tao; Lu, Xiaofei
• Is Part Of: Solid state communications. Volume 247(2016)
• Page Start: 27
• Page End: 30
• Publication Date: 2016-12
• Subjects: MnCoGe -- Curie temperature -- Magnetocaloric effect -- Magnetic refrigeration; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2016.06.011
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: Mn1-x Alx CoGe alloys with a second order transition were produced by arc-melting method. The substitution of Mn by Al increased the Curie temperature ( T C ) from 260.5 K to 300.8 K, the magnetic entropy change (|Δ S M |) decreased from 3.78 J·Kg −1 K −1 to 2.35 J·Kg −1 K −1 under a field change of Δµ0 H=5 T. In addition, the |Δ S M | well linearly depends on the H 2/3 around T C . Furthermore, the relative cooling power (RCP) can reach 242.3 J·Kg −1 with a large full width at half maximum of |Δ S M | (75.5 K) for x=0.02. The decrease of |Δ S M | is explained by the corresponding monotonical decrease of magnetic moment per formula unit. Highlights: Alloys exhibit a second order transition. Al doping increases the Curie temperature. A large full width at half maximum is achieved around the TC . A corresponding monotonical decrease between µf.u. and |ΔSM | is reported.