Phase diagram of the Shastry-Sutherland Kondo lattice model with classical localized spins: a variational calculation study

• Main Authors: Shahzad, Munir, Sengupta, Pinaki
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2017
• Subjects: Kondo lattice model; Chiral magnetic states
• Online Access: https://hdl.handle.net/10356/85614; http://hdl.handle.net/10220/43772
• Institution: Nanyang Technological University

We study the Shastry-Sutherland Kondo lattice model with additional Dzyaloshinskii–Moriya (DM) interactions, exploring the possible magnetic phases in its multi-dimensional parameter space. Treating the local moments as classical spins and using a variational ansatz, we identify the parameter ranges over which various common magnetic orderings are potentially stabilized. Our results reveal that the competing interactions result in a heightened susceptibility towards a wide range of spin configurations including longitudinal ferromagnetic and antiferromagnetic order, coplanar flux configurations and most interestingly, multiple non-coplanar configurations including a novel canted-flux state as the different Hamiltonian parameters like electron density, interaction strengths and degree of frustration are varied. The non-coplanar and non-collinear magnetic ordering of localized spins behave like emergent electromagnetic fields and drive unusual transport and electronic phenomena.