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The La(Fe,Mn,Si) 13 H z magnetic phase transition under pressure
Author(s) -
Lovell Edmund,
Bez Henrique N.,
Boldrin David C.,
Nielsen Kaspar K.,
Smith Anders,
Bahl Christian R. H.,
Cohen Lesley F.
Publication year - 2017
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201700143
Subject(s) - magnetic refrigeration , hysteresis , hydrostatic pressure , materials science , condensed matter physics , phase transition , thermal hysteresis , magnetic field , hydrostatic equilibrium , magnetic hysteresis , phase (matter) , thermodynamics , magnetization , chemistry , physics , organic chemistry , quantum mechanics
We study the magnetocaloric metamagnetic transition in LaFe 11.74 Mn 0.06 Si 1.20 and LaFe 11.76 Mn 0.06 Si 1.18 H 1.65 under hydrostatic pressure up to 1.2 GPa. For both compounds, hydrostatic pressure depresses the zero field critical temperature. However, in detail, pressure influences the magnetic properties in different ways in the two compounds. In the dehydrogenated case the transition broadens under pressure whereas in the hydrogenated case the transition sharpens. In both cases thermal hysteresis increases under pressure, although with different trends. These observations suggest both intrinsic and extrinsic hysteresis loss brought about by the use of hydrostatic pressure. We explore the multicaloric field‐pressure cycle, demonstrating that although the gain introduced by overcoming the magnetic hysteresis loss is closely countered by the loss introduced in the pressure cycle, there are significant advantages in that the temperature range of operation can be finely tuned and extended, and the magnetocaloric transition can operate in lower absolute applied fields (<0.5 T), potentially overcoming one of the most significant bottlenecks to the commercialization of this technology.