Magnetic ordering of novel La3NiGe2-type R3CoGe2 compounds (R = Pr, Nd, Sm, Gd - Dy)статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The novel R3CoGe2 compounds adopt the La3NiGe2-type structure (space group Pnma) with the following cell parameters: a = 1.1706(1), b = 0.42267(5), c = 1.1242(1) nm for Sm3CoGe2; a = 1.15845(5),b = 0.41905(2), c = 1.12088(5) nm for Gd3CoGe2; a = 1.14942(4), b = 0.41705(2), c = 1.11030(4) nm for Tb3CoGe2 and a = 1.1431(2), b = 0.41500(5), c = 1.1040(2) nm for Dy3CoGe2. The R3CoGe2 compounds undergo a ferrimagnetic type ordering (TCN = 150 K for Gd3CoGe2). Neutron diffraction studies show that Pr3CoGe2 and Nd3CoGe2 have a commensurate ferromagnetic component along the a axis and a commensurate antiferromagnetic component along the c axis (Pn’ma magnetic space group):(MPrF)a is 2.59(9) mB, (MPrAF)c is 1.58(4) mB, MPr = 3.03(9) mB for Pr3CoGe2 and (MNdF)a is 2.6(1) mB,(MNdAF)c is 1.65(6) mB, MNd = 3.1(1) mB for Nd3CoGe2 at 2 K.
Magnetocaloric effect of Gd3CoGe2 in terms of the isotherm entropy change, DSiso, was derived from the magnetization measurement, and it reaches the maximum value of DSiso = -4.9 J/kgK in the 139-144 K temperature range.