Magnetic Properties and Magnetocaloric Effect οf R_{1-x}R'_{x}Mn_{2}Ge_{2} Compounds

• Authors: M. Duraj , A. Szytuła
• Languages of publication: EN

Abstracts

EN

The magnetic and magnetocaloric properties of Sm_{1-x}Gd_{x}Mn_{2}Ge_{2} compounds with 0 ≤ x ≤ 0.10 have been studied. SmMn_{2}Ge_{2} is antiferromagnetic below the Néel temperature T_{N} ( ≈ 400 K). Further cooling leeds to canted ferromagnetic phase below T_C = 341 K. With decreasing temperature, two metamagnetic phase transitions are observed: F2-AF1 at T_2 = 153 K and AF1-F1 at T_1 = 106 K. The maximum values of magnetic entropy change | Δ S_m | are found to be 1.5 J K^{-1} kg^{-1} at T_{1} and 2.0 J K^{-1} kg^{-1} at T_{2} in SmMn_{2}Ge_{2}. The MCE is found to increase with Gd concentration, | Δ S_{m}(T_{1}) | = 3.3 J K^{-1} kg^{-1}, while | Δ S_{m}(T_{2})| is slightly enhanced for x = 0.1. The magnetocaloric effect is found to be positive at T_{1} and negative at T_{2}.

Keywords

EN

75.30.Kz; 75.30.Sg

Discipline

• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 117
• Issue: 4
• Pages: 603-606

Dates

published

2010-04

Contributors

author

M. Duraj

• Institute of Physics, Technical University of Cracow, Podchorążych 1, 30-084 Kraków, Poland

author

A. Szytuła

• M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

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Identifiers

DOI

10.12693/APhysPolA.117.603