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

Shahzad, Munir; Sengupta, Pinaki

doi:10.1088/1361-648x/aa73bb

Cited by 9 publications

(7 citation statements)

References 60 publications

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“…We also note that the Dzyaloshinskii-Moriya interaction plays an important role for the Kondo effect and magnetic order at the interface between different materials. Theoretical research in this direction appears to be ongoing [121,122], but the impact on the f -electron superlattice is not clear at the moment.…”

Section: Discussionmentioning

confidence: 99%

Emergent exotic superconductivity in artificially engineered tricolor Kondo superlattices

et al. 2017

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In the quest for exotic superconducting pairing states, the Rashba effect, which lifts the electronspin degeneracy as a consequence of strong spin-orbit interaction (SOI) under broken inversion symmetry, has attracted considerable interest. Here, to introduce the Rashba effect into two-dimensional (2D) strongly correlated electron systems, we fabricate non-centrosymmetric (tricolor) superlattices composed of three kinds of f -electron compounds with atomic thickness; d-wave heavy fermion superconductor CeCoIn5 sandwiched by two different nonmagnetic metals, YbCoIn5 and YbRhIn5. We find that the Rashba SOI induced global inversion symmetry breaking in these tricolor Kondo superlattices leads to profound changes in the superconducting properties of CeCoIn5, which are revealed by unusual temperature and angular dependences of upper critical fields that are in marked contrast with the bulk CeCoIn5 single crystals. We demonstrate that the Rashba effect incorporated into 2D CeCoIn5 block layers is largely tunable by changing the layer thickness. Moreover, the temperature dependence of in-plane upper critical field exhibits an anomalous upturn at low temperatures, which is attributed to a possible emergence of a helical or stripe superconducting phase. Our results demonstrate that the tricolor Kondo superlattices provide a new playground for exploring exotic superconducting states in the strongly correlated 2D electron systems with the Rashba effect.

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Section: Discussionmentioning

confidence: 99%

Emergent exotic superconductivity in artificially engineered tricolor Kondo superlattices

et al. 2017

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“…Further, the use of an external Zeeman field enhances the possibility of having noncoplanar phases significantly. Previously, we have shown that the Kondo lattice model on the SS lattice exhibits noncoplanar and noncollinear ground states over a wide range of parameters [46][47][48]. In this work, we aim to thoroughly study the effect of all the competing interactions in stabilizing the noncoplanar phases and investigate the transport properties of itinerant electrons on this lattice.…”

Section: Introductionmentioning

confidence: 99%

Topological Hall effect in the Shastry-Sutherland lattice

2020

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We study the classical Heisenberg model on the geometrically frustrated Shastry-Sutherland (SS) lattice with additional Dzyaloshinskii-Moriya (DM) interaction in the presence of an external magnetic field. We show that several noncollinear and noncoplanar magnetic phases, such as the flux, all-in/all-out, 3-in-1-out/3-out-1-in, and canted-flux phases are stabilized over wide ranges of parameters in the presence of the DM interaction. We discuss the role of DM interaction in stabilizing these complex magnetic phases. When coupled to these noncoplanar magnetic phases, itinerant electrons experience a finite Berry phase, which manifests in the form of topological Hall effect, whereby a nonzero transverse conductivity is observed even in the absence of a magnetic field. We study this anomalous magnetotransport by calculating the electron band structure and transverse conductivity for a wide range of parameter values, and demonstrate the existence of topological Hall effect in the SS lattice. We explore the role of the strength of itinerant electron-local moment coupling on electron transport and show that the topological Hall features evolve significantly from strong to intermediate values of the coupling strength, and are accompanied by the appearance of a finite spin Hall conductivity.

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“…Since DMI is ubiquitous in all of these materials, it is natural to supplement the canonical SS model with DMI. This results in an even richer variety of magnetic orderings including colinear, coplanar and non-coplanar spin configurations, several of which host topological magnons [17,36]. Previous studies of topological magnons for the SS lattice were restricted to the dimer [37] and the ferro-magnetic phases [38].…”

Section: Introductionmentioning

confidence: 99%

The topological magnon bands in the Flux state in Sashtry-Sutherland lattice

Bhowmick,

Sengupta

2020

Preprint

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We investigate low energy magnon excitations above the non-collinear flux state and non-coplanar canted flux state in a Heisenberg anti-ferromagnet with Dzyaloshinskii-Moriya interaction (DMI) on a Sashtry-Sutherland lattice. While previous studies have shown the presence of topological magnetic excitation in the dimer and ferromagnetic phases on the Shastry-Sutherland lattice, our results establish the non-trivial topology of magnons in the anti-ferromagnetic flux and canted flux states. Our results uncover the existence of a multitude of topological phase transitions in the magnon sector -evidenced by the changing Chern numbers of the single magnon bands -as the Hamiltonian parameters are varied, even when the ground state remains unchanged. The thermal Hall conductivity is calculated and its derivative is shown to exhibit a logarithmic divergence at the phase transitions, independent of the type of band touching involved. This may provide a useful means to identify the energy at which the transition occurs. Finally, we propose the way to realize the studied model in a practical material.

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

Cited by 9 publications

References 60 publications

Emergent exotic superconductivity in artificially engineered tricolor Kondo superlattices

Emergent exotic superconductivity in artificially engineered tricolor Kondo superlattices

Topological Hall effect in the Shastry-Sutherland lattice

The topological magnon bands in the Flux state in Sashtry-Sutherland lattice

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