Thermal spin dynamics of Kitaev magnets: Scattering continua and magnetic field induced phases within a stochastic semiclassical approach

Franke, Oliver; Călugăru, Dumitru; Nunnenkamp, Andreas; Knolle, Johannes

doi:10.1103/physrevb.106.174428

Cited by 11 publications

(2 citation statements)

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“…Given the contrast between PdCrO

and PdCoO

, it is plausible that the fluctuations of the Cr-local moments play a crucial role in the electronic transport lifetimes even at the relatively high temperatures of interest (i.e., for

). However, recent work ( 40 ) has demonstrated that electrons scattering off the fluctuations of a “cooperative” paramagnet ( 41 – 48 ) can not account for a

-linear resistivity; instead, the resistivity saturates to a temperature-independent value for

. Starting with a microscopic model, we will now demonstrate that the resolution to the conundrum lies in a previously ignored and nontrivial interaction term between the Pd-electrons, the Cr-spins, and phonons, as encoded in an electron-magneto-elastic (EME) coupling.…”

Section: An Experimental Puzzlementioning

confidence: 99%

“…In recent work ( 40 ), some of us analyzed the properties of a subset of the terms (

) in Eq. 1a at leading order in a small

by approximating the local moments as

vectors, but capturing their complex precessional dynamics using the Landau–Lifshitz equations ( 41 – 48 ). While this leads to an interesting frequency dependence and momentum-dependent cross-overs in the electronic self-energy, the temperature dependence can be understood entirely based on a high-temperature expansion with uncorrelated local moments.…”

Section: Modelmentioning

confidence: 99%

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T-linear resistivity from magneto-elastic scattering: Application to PdCrO ₂

Mendez-Valderrama,

Tulipman,

Zhakina

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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An electronic solid with itinerant carriers and localized magnetic moments represents a paradigmatic strongly correlated system. The electrical transport properties associated with the itinerant carriers, as they scatter off these local moments, have been scrutinized across a number of materials. Here, we analyze the transport characteristics associated with ultraclean PdCrO 2 —a quasi-two-dimensional material consisting of alternating layers of itinerant Pd-electrons and Mott-insulating CrO 2 layers—which shows a pronounced regime of T -linear resistivity over a wide range of intermediate temperatures. By contrasting these observations to the transport properties in a closely related material PdCoO 2 , where the CoO 2 layers are band-insulators, we can rule out the traditional electron–phonon interactions as being responsible for this interesting regime. We propose a previously ignored electron-magneto-elastic interaction between the Pd-electrons, the Cr local moments and an out-of-plane phonon as the main scattering mechanism that leads to the significant enhancement of resistivity and a T -linear regime in PdCrO 2 at temperatures far in excess of the magnetic ordering temperature. We suggest a number of future experiments to confirm this picture in PdCrO 2 as well as other layered metallic/Mott-insulating materials.

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“…Given the contrast between PdCrO

and PdCoO

, it is plausible that the fluctuations of the Cr-local moments play a crucial role in the electronic transport lifetimes even at the relatively high temperatures of interest (i.e., for

). However, recent work ( 40 ) has demonstrated that electrons scattering off the fluctuations of a “cooperative” paramagnet ( 41 – 48 ) can not account for a

-linear resistivity; instead, the resistivity saturates to a temperature-independent value for

Section: An Experimental Puzzlementioning

confidence: 99%

“…In recent work ( 40 ), some of us analyzed the properties of a subset of the terms (

) in Eq. 1a at leading order in a small

by approximating the local moments as

Section: Modelmentioning

confidence: 99%

T-linear resistivity from magneto-elastic scattering: Application to PdCrO ₂

Mendez-Valderrama,

Tulipman,

Zhakina

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Majorana quasiparticles emergent in Kitaev spin liquid

Nasu

2023

Progress of Theoretical and Experimental Physics

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This paper reviews the nature of two quasiparticles, Majorana fermion and vison, emergent in the Kitaev model, mainly from the theoretical point of view. We demonstrate how the fractionalization of a quantum spin into these two quasiparticles occurs and clarify their properties in the presence and absence of magnetic fields. In addition to discussions on the itinerant nature inherent to Majorana fermions, the quantum dynamics of visons induced by an applied magnetic field is revealed. Fractional quasiparticles manifest themselves in temperature evolutions of thermodynamic quantities, excitation spectra, and transport properties. The formulations for them and calculation results are shown in detail. Based on the results, we present how the signatures of fractional quasiparticles appear in physical quantities. The paper also mentions the recent developments of the experimental and theoretical works of Kitaev-related systems and presents outlooks of studies on these systems.

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