Magnetocaloric effect in metamagnetic borocarbide DyNi2−xAxB2C (A=Co and Cr) compounds

Review of magnetic properties and magnetocaloric effect in the intermetallic compounds of rare earth with low boiling point metals

“…The resulted temperature dependence of -S M is shown in Fig 19 for x = 2) at 2 K, the hysteresis is ignorable for all the present DyNi 2-x A x B 2 C which is beneficial for application. I. e. similar to that of Dy site Tm substitution, [104] Ni site Co or Cr substitution also can effectively reduce (even eliminate) the magnetic hysteresis of DyNi 2 B 2 C. [107] To evaluate the MCE in DyNi [107]…”

“…[99][100][101][102][103] In recent years, we have further investigated the MCE in parent and doped RENi 2 B 2 C superconductors. [104][105][106][107] The main achievements will be shown in the following sections. The superconducting transition and magnetic ordering temperatures together with MCE parameters are summarized in [102,104] A set of selected magnetic isothermals M(H)…”

“…The values of -S M max are evaluated to be16.3, 10.2, 16.1 and 13.7 J/kg K; and to be 19.3, 13.7, 19.1 and 15.8 J/kg K for x = 0.1 (Co), 0.2 (Co), 0.1 (Cr) and 0.2 (Cr) in DyNi 2-x A x B 2 C for the magnetic field changes of 0-5 and 0-7 T, respectively. [107] Zhang and Yang [108] have investigated the magnetic properties and magnetocaloric effect (MCE) in ErNi 2-x Fe x B 2 C (x = 0, 0.1 and 0. gradually shifts to low temperature with increasing x, while the values of -S M max remain at almost the same high value which make the Dy 1-x Ho x Ni 2 B 2 C compounds attractive for active magnetic-refrigeration for low temperature magnetic refrigeration. The present results may provide some valuable information for searching proper magnetic materials for low temperature magnetic refrigeration.…”

“…(Colour online) Magnetic isothermals on increasing (open symbols) and decreasing (filled symbols) field at 2 K for DyNi 2-x A x B 2 C (A = Co and Cr, x = 0.1 and 0.2). [107] Fig. 22.…”

Quaternary borocarbides: Relatively high T intermetallic superconductors and magnetic superconductors

“…An attempt to synthesize SmRu 2 B 2 C produced a material with hexagonal phase with a possible composition SmRu 3 B 2 C x (it is to be noted that SmRu 3 B 2 itself does not seem to form) which orders ferromagnetically around 60 K. The interesting aspect about this material is that at 5 K, it has a huge coercive field $15 T or larger [48]. Recently, giant magnetocalorific effect (MCE) had been reported in RNi 2 B 2 C (R = Dy, Ho, Er) [49] which seems to show potentials for magnetic refrigeration/heat pump application based on MCE. Table 1 gives a list of reported superconducting members of QBC along with their T c [15].…”