Suppressed Fluctuations as the Origin of the Static Magnetic Order in Strained ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$

Suppressed Fluctuations as the Origin of the Static Magnetic Order in Strained ${Sr}_{2} {RuO}_{4}$

Bongjae Kim, Sergii Khmelevskyi, Cesare Franchini, and I. I. Mazin

Phys. Rev. Lett. 130, 026702 – Published 13 January 2023

Abstract

Combining first-principles density-functional calculations and Moriya’s self-consistent renormalization theory, we explain the recently reported counterintuitive appearance of an ordered magnetic state in uniaxially strained ${Sr}_{2} {RuO}_{4}$ beyond the Lifshitz transition. We show that strain weakens the quantum spin fluctuations, which destroy the static order, more strongly than the tendency to magnetism. A different rate of decrease of the spin fluctuations vs magnetic stabilization energy promotes the onset of a static magnetic order beyond a critical strain.

Received 22 June 2022
Revised 4 October 2022
Accepted 21 December 2022

DOI:https://doi.org/10.1103/PhysRevLett.130.026702

Physics Subject Headings (PhySH)

Magnetic order Superconductivity

First-principles calculations

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Bongjae Kim ^1,*, Sergii Khmelevskyi², Cesare Franchini^3,4, and I. I. Mazin ^5,6,†

¹Department of Physics, Kunsan National University, Gunsan 54150, Korea
²Center for Computational Materials Science, Institute for Applied Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria
³University of Vienna, Faculty of Physics and Center for Computational Materials Science, Vienna A-1090, Austria
⁴Dipartimento di Fisica e Astronomia, Università di Bologna, 40127 Bologna, Italy
⁵Department of Physics and Astronomy, George Mason University, Fairfax, Virginia 22030, USA
⁶Quantum Science and Engineering Center, George Mason University, Fairfax, Virginia 22030, USA