Phase transitions and magnetocaloric and transport properties in off-stoichiometric GdNi2Mnx

Aryal, Anil; Quetz, Abdiel; Pandey, Sudip; Samanta, Tapas; Dubenko, Igor; Mazumdar, Dipanjan; Stadler, Shane; Ali, Naushad

doi:10.1063/1.4940877

Title: Phase transitions and magnetocaloric and transport properties in off-stoichiometric GdNi₂Mn_x

Journal Article · Thu Jan 28 00:00:00 EST 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4940877· OSTI ID:1469195

Aryal, Anil ^[1]; Quetz, Abdiel ^[1]; Pandey, Sudip ^[1]; Samanta, Tapas ^[2]; Dubenko, Igor ^[1]; Mazumdar, Dipanjan ^[1]; Stadler, Shane ^[2]; Ali, Naushad ^[1]

Southern Illinois Univ. Carbondale, IL (United States)
Louisiana State Univ., Baton Rouge, LA (United States)

Here, the structural, magnetic, magnetocaloric, transport, and magnetoresistance properties of the rare-earth intermetallic compounds GdNi₂Mn_x (0.5 ≤ x ≤ 1.5) have been studied. The compounds with x = 0.5 and 0.6 crystallize in the cubic MgCu₂ type phase, whereas samples with x ≥ 0.8 form a mixed MgCu₂ and rhombohedral PuNi₃ phase. A second order magnetic phase transition from a ferromagnetic to paramagnetic state was observed near the Curie temperature (T_C). The GdNi₂Mn_x (0.5 ≤ x ≤ 1.5) compounds order in a ferrimagnetic structure in the ground state. The largest observed values of magnetic entropy changes (at T_C for ΔH = 5T) were 3.9, 3.5, and 3.1 J/kg K for x = 0.5, 0.6, and 0.8, respectively. The respective relative values of the cooling power were 395, 483, and 220 J/kg. These values are greater than some well-known prototype magnetocaloric materials such as Gd (400 J/kg) and Gd₅Si₂Ge₂ (240 J/kg). Analysis of the resistivity data showed a T² dependence at low temperatures, suggesting strong electron-phonon interactions, whereas at higher temperatures s-d scattering was dominated by the electron-phonon contribution, resulting in a slow increase in resistivity. Magnetoresistance values of ~–1.1% were found for x = 0.5 near T_C, and –7% for x = 1.5 near T = 80 K.

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Research Organization:: Southern Illinois Univ., Carbondale, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-06ER46291; FG02-13ER46946

OSTI ID:: 1469195

Alternate ID(s):: OSTI ID: 1236398

Journal Information:: Journal of Applied Physics, Vol. 119, Issue 4; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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References (16)

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