Pressure-induced antiferromagnetic dome in the heavy-fermion Yb2Pd2In1−xSnx system

Abstract

In the heavy-fermion system Yb 2 Pd 2 In 1−x Sn x , the interplay of crystal-field splitting, Kondo effect, and Ruderman-Kittel-Kasuya-Yosida interactions leads to complex chemical-, pressure-, and magnetic-field phase diagrams, still to be explored in full detail. By using a series of techniques, we show that even modest changes of parameters other than temperature are sufficient to induce multiple quantum-critical transitions in this highly susceptible heavy-fermion family. In particular, we show that, above ∼ 10 kbar, hydrostatic pressure not only induces an antiferromagnetic phase at low temperature, but it likely leads to a reorientation of the Yb magnetic moments and/or the competition among different antiferromagnetic configurations.

Superconductivity in La$_2$Ni$_2$In

“…For R 2 T 2 X (R=Ce,Yb), the f-electrons of the rare earths can also display mixed valence behaviors [8][9][10][11][12][13] , indicating that coupling of the f-electrons to extended states can lead to the overall suppression of magnetic moments. It is expected that the interplay of strong quantum fluctuations due to the unique R 2 T 2 X lattice [13][14][15] , and as well proximity to the delocalization of the f-electrons via the Kondo effect can result in the destabilization of ordered phases, and to the formation of quantum critical points (QCPs) where the host systems are transitioning among different phases 9,13,[16][17][18] . Given this richness of behavior when the rare earth R has f-electrons, it is surprising that relatively little is known about compounds from this family where R=La,Lu,Y , where there are no valence f-electrons.…”