Heavy fermion Ce3Co4Sn13 compound under pressure

Abstract

The non-magnetic heavy fermion compound Ce 3 Co 4 Sn 13 was studied under pressure. We report single crystalline measurements of electrical resistivity as a function of temperature q(T) under pressure. Some characteristic features related to a structural transition (T S ), crystalline field effects (T CEF ), and a low temperature maximum (T max ), possibly connected simultaneously to the onset of Kondo lattice coherence and short range magnetic correlations, were identified in the q(T) data. A pressure-temperature phase diagram with T S and T max was constructed by mapping these features. Like for most Ce-based heavy fermion compounds, T max moves to higher temperatures with pressure, indicating that it is related to the Kondo energy scale, due to the increase of hybridization induced by pressure. On the other hand, T S , associated to a superlattice distortion and probably combined with a charge density wave transition, decreases as a function of pressure. However, differently from the Sr 3Àx Ca x Ir 4 Sn 13 system, where a superlattice quantum phase transition is observed [L. E. Klintberg et al., Phys. Rev. Lett. 109, 237 008 (2012)], in Ce 3 Co 4 Sn 13 T S $ 154 K, at ambient pressure (P ¼ 0), seems to stabilize at around 143 K for P ! 19 kilobars. We also investigated q(T) in external magnetic fields, at P ¼ 0. Negative magnetoresistance and increase of T max are observed, suggesting suppression of low temperature short range magnetic correlations. V C 2015 AIP Publishing LLC. [http://dx.

Robust Narrow-Gap Semiconducting Behavior in Square-Net La3Cd2As6

“…Upon cooling, a sudden increase in the resistivity is observed at T CDW = 279 K for La 3 Cd 2 As 6 and at T CDW = 136 K for Ce 3 Cd 2 As 6 . Below T CDW , the observed semiconducting behavior indicates the opening of an energy gap due to the CDW phase transition, similar to Sr 3 Ir 4 Sn 13 , Ca 3 Ir 4 Sn 13 , Ce 3 Co 4 Sn 13 , and La 3 Co 4 Sn 13 . − Notably, the resistivity of La 3 Cd 2 As 6 increases up to 10 10 Ω cm at 12 K, as presented in the inset of Figure a. This large increase of 13 orders of magnitude is a rare property in narrow-gap semiconductors, which are typically prone to impurity bands that may dominate the electronic properties at low temperatures. , Remarkably, this increase was achieved in the as-grown single crystal, which suggests that sample quality could be improved through further purification.…”

Robust narrow-gap semiconducting behavior in square-net La$_{3}$Cd$_{2}$As$_{6}$

“…Upon cooling, a sudden increase in the resistivity is observed at T CDW = 279 K for La3Cd2As6 and at T CDW = 136 K for Ce 3 Cd 2 As 6 . Below T CDW , the observed semiconducting behavior indicates the opening of an energy gap due to the CDW phase transition, similar to Sr 3 Ir 4 Sn 13 , Ca 3 Ir 4 Sn 13 36 , Ce 3 Co 4 Sn 13 and La 3 Co 4 Sn 13 [37][38][39][40] . Notably, the resistivity of La 3 Cd 2 As 6 increases up to 10 10 Ω cm at 12 K, as presented in the inset of Fig.…”

Nonmagnetic ground state, Crystal field effects and Heavy-fermion behaviour in the Remeika Phase: Pr$_3$Ir$_4$Ge$_{13}$

“…For example, (Ca, Sr) 3 Ir 4 Sn 13 exhibit charged density wave order at T = 33 K and 138 K respectively and the transition temperature can be suppressed by chemical or physical pressure to drive the system close to a quantum critical point [12,11]. Another interesting stannide based compound is Ce 3 Co 4 Sn 13 which shows complicated semiconducting property and exhibits single channel single ion impurity Kondo effect with T K (Kondo temperature) = 1.5 K [13,14]. Based on structural, magnetic, and electrical transport properties, it is observed that the Pr containing compounds crystallize in cubic structure with 3+ ionic state with no magnetic ordering and presence of crystalline electric field excitations.…”