The influence of Au substitution and hydrostatic pressure on the phase transitions and magnetocaloric properties of MnCoGe alloys

Chen, Jing-Han; Trigg, Aaron; Poudel Chhetri, Tej; Young, David P.; Dubenko, Igor; Ali, Naushad; Stadler, Shane

doi:10.1063/5.0007172

Title: The influence of Au substitution and hydrostatic pressure on the phase transitions and magnetocaloric properties of MnCoGe alloys

Journal Article · Sun Jun 07 00:00:00 EDT 2020 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0007172· OSTI ID:1658119

Chen, Jing-Han ^[1]; Trigg, Aaron ^[1]; Poudel Chhetri, Tej ^[1]; Young, David P. ^[1]; Dubenko, Igor ^[2]; Ali, Naushad ^[2]; Stadler, Shane ^[1]

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

In this work, the phase transitions and magnetocaloric properties of Mn_1--xAu_xCoGe (0≤x≤0.025) alloys were studied as a function of concentration x and applied hydrostatic pressure. The increasing substitution of Au for Mn results in the decrease of the first-order martensitic transition temperature, and this first-order martensitic transition was ultimately converted to a second-order magnetic transition when the Au substitution (x) reached 0.025. The magnitudes of the maximum magnetic entropy changes increased when the magnetic and structural transitions were coupled, which occurred for 0.005≤x≤0.020. The largest maximum magnetic entropy change for a field change of μ₀ΔH=7 T was 33.1J/kgK for the sample with x=0.020. Similar to the effect of Au substitution, the first-order martensitic transition temperature initially decreased, and then converted to second order, when the applied hydrostatic pressure reached a large enough value. Interestingly, both Au substitution and pressure application cause a volume reduction and, in both cases, the first-order martensitic transition temperature initially reduced and then converted to second-order. These results suggest two different methods of tuning the transition temperatures in these magnetocaloric materials. One can either apply hydrostatic pressure and temporarily adjust the transition temperatures or modify the composition chemically and permanently change the transition temperatures.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0010421; FG02-13ER46946; FG02-06ER46291; SC0010521

OSTI ID:: 1658119

Alternate ID(s):: OSTI ID: 1631394; OSTI ID: 1658120; OSTI ID: 1872466

Journal Information:: Journal of Applied Physics, Vol. 127, Issue 21; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Title: The influence of Au substitution and hydrostatic pressure on the phase transitions and magnetocaloric properties of MnCoGe alloys

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