Premium
Magnetic transitions and the magnetocaloric effect in the Pr 1− x Y x Mn 2 Ge 2 system
Author(s) -
Wang J. L.,
Campbell S. J.,
Md Din M. F.,
Kennedy S. J.,
Hofmann M.
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201330640
Subject(s) - antiferromagnetism , magnetic refrigeration , ferromagnetism , magnetization , neutron diffraction , condensed matter physics , materials science , crystallography , phase diagram , crystal structure , chemistry , phase (matter) , physics , magnetic field , organic chemistry , quantum mechanics
Layered rare earth compounds in the RMn 2 X 2 series (R = rare‐earth; X = Ge, Si) are of interest for potential cooling applications at lower temperatures as they enable the structural and magnetic behavior to be controlled via substitution of R, Mn, and X atoms on the 2a, 4d, and 4e sites respectively. We continue investigations of the Pr 1− x Y x Mn 2 Ge 2 magnetic phase diagram as functions of both composition and Mn–Mn spacing using X‐ray and neutron diffraction, magnetization and differential scanning calorimetry measurements. Pr 1− x Y x Mn 2 Ge 2 exhibits an extended region of re‐entrant ferromagnetism around x ∼ 0.5 with re‐entrant ferromagnetism atT c Pr ∼ 50 K for Pr 0.5 Y 0.5 Mn 2 Ge 2 . The entropy values −Δ S M around the ferromagnetic transition temperaturesT C interfrom the layered antiferromagnetic AF l structure to the canted ferromagnetic structure F mc (typicallyT C inter ∼ 330 – 340 K ) have been derived for Pr 1− x Y x Mn 2 Ge 2 with x = 0.0, 0.2, and 0.5 for Δ B = 0–5 T. The changes in magnetic states due to Y substitution for Pr are discussed in terms of chemical pressure, external pressure, and electronic effects.