Magnetic Transition and Magnetocaloric Effect of Gd{sub 1−x}Nd{sub x}Mn{sub 2}Ge{sub 2} (x = 0.3 and 0.4) Compounds

Journal Article · Thu Nov 15 04:00:00 EST 2018 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-018-4641-8· OSTI ID:22782466

Guo, D. L.; Lin, S. D.; Wen, B.; Rao, G. H.; Zhou, H. Y. ^[1]

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1. Guilin University of Electronic Technology, School of Materials Science and Engineering and Guangxi Key Laboratory of Information Materials (China)

Gd{sub 1−x}Nd{sub x}Mn{sub 2}Ge{sub 2} compounds with x = 0.3 and 0.4 were prepared by arc melting and crystallized in the ThCr{sub 2}Si{sub 2}-type structure with the space group I4/mmm based on X-ray powder diffraction (XRD) results. Magnetic transition and magnetocaloric effect (MCE) of the Gd{sub 1−x}Nd{sub x}Mn{sub 2}Ge{sub 2} compounds were investigated by magnetic measurements on a physical property measurement system (PPMS). Gd{sub 0.7}Nd{sub 0.3}Mn{sub 2}Ge{sub 2} compound exhibits complicated magnetic transitions at around 63 K (T{sub comp}), 86 K (T{sub 1}), 136 K (T{sub C}), 260 K (T{sub N}{sup inter}), and 347 K (T{sub C}{sup inter}), respectively, while Gd{sub 0.6}Nd{sub 0.4}Mn{sub 2}Ge{sub 2} compound shows a spin re-orientation transition at about 52 K. Combined with isothermal magnetization curves and the Maxwell relation, the maximum magnetic entropy changes of Gd{sub 0.7}Nd{sub 0.3}Mn{sub 2}Ge{sub 2} and Gd{sub 0.6}Nd{sub 0.4}Mn{sub 2}Ge{sub 2} were calculated to be 4.31 and 5.15 J kg{sup − 1} K{sup − 1} under the applied magnetic field changing from 0 to 5 T, respectively.

• OSTI ID: 22782466
• Journal Information: Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 11 Vol. 31; ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL STRUCTURE
ENTROPY
GADOLINIUM COMPOUNDS
GERMANIUM COMPOUNDS
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANESE COMPOUNDS
NEODYMIUM COMPOUNDS
SPACE GROUPS
SPIN
SULFUR COMPOUNDS
TETRAGONAL LATTICES
X-RAY DIFFRACTION