Characteristic Timescales of the Local Moment Dynamics in Hund's Metals

Characteristic Timescales of the Local Moment Dynamics in Hund’s Metals

C. Watzenböck, M. Edelmann, D. Springer, G. Sangiovanni, and A. Toschi

Phys. Rev. Lett. 125, 086402 – Published 20 August 2020

Abstract

We study the characteristic timescales of the fluctuating local moments in Hund’s metal systems for different degrees of correlation. By analyzing the dynamical spin susceptibility in the real-time domain, we determine the timescales controlling oscillation and damping of on-site fluctuations—a crucial factor for the detection of local moments with different experimental probes. We apply this procedure to different families of iron pnictides or chalcogenides, explaining the material trend in the discrepancies reported between experimental and theoretical estimates of their magnetic moments.

Received 27 January 2020
Accepted 16 July 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.086402

Physics Subject Headings (PhySH)

Antiferromagnetism Metal-insulator transition Spin dynamics Spin fluctuations

Iron-based superconductors Multiple time scale dynamics Strongly correlated systems

Approximation methods for many-body systems DFT+DMFT Electron-correlation calculations Hubbard model Many-body techniques Quantum Monte Carlo

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

C. Watzenböck ¹, M. Edelmann², D. Springer ¹, G. Sangiovanni ², and A. Toschi ¹

¹Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
²Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, 97074 Würzburg, Germany

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Issue

Vol. 125, Iss. 8 — 21 August 2020

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