Low-temperature heat capacity of antiferromagnetic ternary rare-earth iron silicidesM2Fe3Si

Low-temperature heat-capacity studies ofR2Ni3Si5Mazumdar1, Ghosh2, Nagarajan3 et al. 1999Phys. Rev. B19040View full textAdd to dashboardCite

“…1-7͒. In this procedure the reasonable assumption, of the nuclear specific heat and nuclear Schottky effect being negligibly small, 15 is made. In the calculations, the fact that one mole of R 2 Ni 3 Si 5 contains two moles of rare-earth ions has been taken into account.…”

Antiferromagnetic ordering in the Kondo lattice systemYb2Fe3Si

“…Surprisingly, the same study . But the same study revealed that the antiferromagnetic ordering temperature of Yb 2 Fe 3 Si 5 lies far above the theoretical curve [8]. In our opinion, there is no reason to invoke something else other than the RKKY interaction for explaining the relatively large value of T N .…”

“…Earlier study [8] showed that the antiferromagetic ordering temperature of the heavy rareearth R 2 Fe 3 Si 5 compounds do follow the deGennes scaling [14] [∼(g J -1) 2 J(J+1)] indicating that the dominant magnetic interaction is the RKKY interaction. Surprisingly, the same study .…”

“…It is worthwhile to point out that we still do not know why the antiferromagnetic order among Tm 3+ ions is a deterrent to the superconductivity in Tm 2 Fe 3 Si 5 given that the neutron scattering studies [10] could not find any ferromagnetic component in the magnetic unit cell in this compound. A recent report has suggested that an antiferromagnet Er 2 Fe 3 Si 5 [11] (below 2.5 K) also shows superconductivity below 1 K whereas an earlier heat-capacity study [8] indicated quadruple magnetic transitions without any superconductivity down to 1.5 K. A previous study [8] on an arc melted Yb 2 Fe 3 Si 5 sample reported the observation of antiferromagnetic ordering of Yb moments around 1.7 K. However, that study did neither establish the Kondo lattice behaviour nor the high value of the Sommerfeld coefficient (γ) as we will see later. In this context, the physical properties of Yb 2 Fe 3 Si 5 are largely unexplored as compared to other compounds of the R 2 Fe 3 Si 5 series.…”

“…A few of them also undergo superconducting transition at low temperatures [3,4]. In the early 80's, several investigations have been carried out to understand the superconductivity and magnetism exhibited by compounds belonging to the R 2 Fe 3 Si 5 system [5][6][7][8]. In this family the Fe atoms do not carry any magnetic moment but help in building a large density of states at the Fermi level [9].…”