Electrical resistivity under extreme conditions in the Ce3Ir4Sn13 heavy fermion compound

Heavy fermion Ce3Co4Sn13 compound under pressure

“…9 For 20 < T < 150 K, a hump-like feature at T CEF $ 35 K can be attributed to CEF effects, which due to the tetragonal site symmetry of Ce 3þ ions in the Ce 3 Co 4 Sn 13 structure, 3 splits the six-fold degenerated J ¼ 5/2 multiplet into three Kramers doublets, as in Ce 3 Ir 4 Sn 13 . 13 An increase of the q(T) data for T Շ 20 K is observed and a maximum at T max is observed, possibly connected simultaneously to the onset of Kondo lattice coherence 19,20 and short range magnetic correlations, seen in low temperature specific heat. 16 The q(T) behavior at ambient pressure is quite different in polycrystalline samples, where the resistivity decreases for T < T S .…”

“…10,11 Ce 3 Ir 4 Sn 13 is also a heavy fermion [c ¼ 0.67 J/(mol-Ce-K 2 )] 6 with possibly some short range ferromagnetic correlations and a low temperature structural phase transition at 2 K, observed in specific heat and electrical resistivity measurements. 12,13 In this work, we study the Ce 3 Co 4 Sn 13 heavy fermion compound under pressure. This material shows no evidence for long range magnetic order, down to 0.3 K, and presents a large increase in the specific heat at low temperatures yielding a high c $ 4 J/(mol-Ce-K 2 ) Sommerfeld coefficient, with a Kondo temperature estimated to be T K ¼ 1.2 K. [14][15][16][17] The magnetic moment is approximately 2.58 l B per Ce 3þ ion, close to the value of 2.54 l B for the free ion.…”

Successive Phase Transitions in R3Ir4Sn13 (R: La and Ce) Investigated Using Neutron and X-ray Diffraction

“…The magnetic susceptibility shows a peak at T 1 , while no clear anomaly is seen at T 2 [15]. Electrical resistivity shows a kink behavior at T 2 , but no distinct anomaly at T 1 [12]. Ce 3 Ir 4 Sn 13 is expected to show a magnetic order below T 1 , in contrast to the paramagnetic T = Co and Rh materials.…”

“…Ce 3 Ir 4 Sn 13 shows a weak temperature dependence of electrical resistivity, and a heavy fermion state was suggested from the large electronic specific-heat coefficient γ = 670 mJ/(K 2 mol-Ce) [11,12]. Whereas the early studies reported the primitive cubic crystal structure (the lattice constant a = 9.72 Å) of Ce 3 Ir 4 Sn 13 [13,14], the recent study reports X-ray reflections characterized by the superlattice wave vector q S1 = (1/2, 1/2, 0) even at room temperature [15].…”