Magnetic structures of non-cerium analogues of heavy-fermionCe2RhIn8: The case ofNd2

Abstract

R 2 RhIn 8 compounds (space group P 4/mmm, R is a rare-earth element) belong to a large group of structurally related tetragonal materials which involves several heavy-fermion superconductors based on Ce. We have succeeded in growing single crystals of compounds with Nd, Dy, and Er, and following our previous bulk measurements, we performed neutron-diffraction studies to determine their magnetic structures. The Laue diffraction experiment showed that the antiferromagnetic order below the Néel temperature is in all three compounds characterized by the propagation vector k = (1/2,1/2,1/2). The amplitude and direction of the magnetic moments, as well as the invariance symmetry of the magnetic structure, were determined by subsequent experiments using two-and four-circle diffractometers. The critical exponents were determined from the temperature dependence of the intensities below T N .

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

“…In addition, to our knowledge, a C-type magnetic ordering was never reported sofar for rare-earth based 1-1-5 systems. This propagation vetor is nonetheless the one of the magnetic order of the actinide based compound NpFeGa 5 [23] and of several rare-earth based compounds related to the 1-1-5 ones by different sequences of atomic stacking [24].…”

Lattice specific heat for the RMIn5 (R=Gd, La, Y; M=Co, Rh) compounds: Non-magnetic contribution subtraction

“…A common experimental procedure to obtain the magnetic contribution to the specific heat is to subtract the specific heat of an analogous non-magnetic compound [2,3,4,5,6,7,8,9,10]. Since the non-magnetic contribution is dominated in general by the lattice degrees of freedom, it is not obvious a priory why this procedure should work.…”