Uniaxial stress effect on quasi-one-dimensional Kondo lattice CeCo₂Ga₈

Abstract

Quantum critical phenomena in the quasi-one-dimensional limit remains an open issue. We report the uniaxial stress effect on the quasi-one-dimensional Kondo lattice CeCo2Ga8 by electric transport and AC heat capacity measurements. CeCo2Ga8 is speculated to sit in close vicinity but on the quantum-disordered side of a quantum critical point. Upon compressing the c axis, parallel to the Ce-Ce chain, the onset of coherent Kondo effect is enhanced. In contrast, the electronic specific heat diverges more rapidly at low temperature when the intra-chain distance is elongated by compressions along a or b axes. These results suggest that a tensile intra-chain strain (ε c > 0) pushes CeCo2Ga8 closer to a quantum critical point, while a compressive intra-chain strain (ε c < 0) likely causes departure. Our work provides a rare paradigm of manipulation near a quantum critical point in a quasi-1D Kondo lattice by uniaxial stress, and paves the way for further investigations on the unique feature of quantum criticality in the quasi-1D limit.

A novel monoclinic phase and electrically tunable magnetism of van derWaals layered magnet CrTe2

“…[1,2] Enormous efforts have been devoted to the fabrication of the various systems and many magnetic materials have been reported, such as CrI 3 , [3] Fe 3 GeTe 2 , [4,5] Cr 3 Te 4 , [6] CrBr 3 , [7] and Cr 2 Ge 2 Te 6 . [8] One of the merits that exploring the vdW layered magnetic system is that the magnetism can normally be tuned by customizing the stacking and doping of the system [9][10][11] or exerting optical method [12][13][14][15] as well as strain engineering, [16][17][18] which are extremely important for the efficient switching in building the magnetic memory devices. Although versatile methodologies have been explored, [19] the delicate tuning of the lattice structure to realize the dramatic change in the magnetism of the vdW layered system is still scarce.…”