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

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...

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Bibliographic Details
Main Authors: Shahzad, Munir, Sengupta, Pinaki
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2017
Subjects:
Online Access:https://hdl.handle.net/10356/85614
http://hdl.handle.net/10220/43772
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Institution: Nanyang Technological University
Language: English
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Summary: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.