Hidden first-order phase transitions and large magnetocaloric effects in GdNi1-xCox

Biswas, Anis; Del Rose, Tyler; Mudryk, Yaroslav; Ribeiro, P. O.; Alho, B. P.; de Sousa, V. S.R.; Nóbrega, E. P.; von Ranke, P. J.; Pecharsky, Vitalij K.

doi:10.1016/j.jallcom.2021.163186

Hidden first-order phase transitions and large magnetocaloric effects in GdNi_1-xCo_x

Journal Article · Thu Dec 09 00:00:00 EST 2021 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2021.163186· OSTI ID:1835551

Biswas, Anis ^[1]; Del Rose, Tyler ^[1]; Mudryk, Yaroslav ^[1]; Ribeiro, P. O. ^[2]; Alho, B. P. ^[2]; de Sousa, V. S.R. ^[2]; Nóbrega, E. P. ^[2]; von Ranke, P. J. ^[2]; Pecharsky, Vitalij K. ^[1]

Ames Lab., and Iowa State Univ., Ames, IA (United States)
Univ. do Estado do Rio de Janeiro (Brazil). Inst. de Fisica

We report a large magnetocaloric effect tunable between 70 and 115 K in a series of rare earth intermetallic compounds GdNi_1-xCo_x with x varying from 0 to 0.15 that manifest rather unconventional second-order phase transitions with concurrent changes in both magnetic and crystallographic sublattices. While the Curie temperature, TC, linearly increases with x(Co), the maximum isothermal entropy change induced by magnetic field varying between 0 and 50 kOe slightly decreases from 14 J/kg K at 71 K when x(Co) = 0 to10 J/kg K at 115 K when x(Co) = 0.15. Additionally, the temperature-averaged entropy change figures of merit calculated at temperature spans of 10 K for all examined compositions are comparable to those of the best known magnetocaloric materials that exhibit second-order phase transitions, including elemental Gd and La(Fe,Co,Si)₁₃ alloys. Through a detailed analysis of the magnetic field-induced entropy changes along with assessment of critical exponents we explore the role magneto-elastic coupling plays in controlling magnetocaloric properties of GdNi_1-xCo_x compounds. We also formulate a model based on the mean field theory approximation to describe both magnetic and magnetocaloric properties of the title materials in qualitative agreement with experimental results.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1835551

Alternate ID(s):: OSTI ID: 1836874

Report Number(s):: IS-J-10,673

Journal Information:: Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 897; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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