Isotropic and anisotropic regimes of the field-dependent spin dynamics in Sr2IrO4: Raman scattering studies

Gim, Y.; Sethi, A.; Zhao, Q.; Mitchell, J. F.; Cao, G.; Cooper, S. L.

doi:10.1103/PhysRevB.93.024405

Title: Isotropic and anisotropic regimes of the field-dependent spin dynamics in ${Sr}_{2} {IrO}_{4}$ : Raman scattering studies

Journal Article · Mon Jan 11 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.024405· OSTI ID:1251155

Gim, Y. ^[1]; Sethi, A. ^[1]; Zhao, Q. ^[2]; Mitchell, J. F. ^[2]; Cao, G. ^[3]; Cooper, S. L. ^[1]

Univ. of Illinois, Urbana, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Kentucky, Lexington, KY (United States)

A major focus of experimental interest in Sr₂IrO₄ has been to clarify how the magnetic excitations of this strongly spin-orbit coupled system differ from the predictions of an isotropic 2D spin-1/2 Heisenberg model and to explore the extent to which strong spin-orbit coupling affects the magnetic properties of iridates. Here, we present a high-resolution inelastic light (Raman) scattering study of the low energy magnetic excitation spectrum of Sr₂IrO₄ and doped Eu-doped Sr₂IrO₄ as functions of both temperature and applied magnetic field. We show that the high-field (H > 1.5 T) in-plane spin dynamics of Sr₂IrO₄ are isotropic and governed by the interplay between the applied field and the small in-plane ferromagnetic spin components induced by the Dzyaloshinskii-Moriya interaction. However, the spin dynamics of Sr₂IrO₄ at lower fields (H < 1.5 T) exhibit important effects associated with interlayer coupling and in-plane anisotropy, including a spin-flop transition at Hc in Sr₂IrO₄ that occurs either discontinuously or via a continuous rotation of the spins, depending upon the in-plane orientation of the applied field. Furthermore, these results show that in-plane anisotropy and interlayer coupling effects play important roles in the low-field magnetic and dynamical properties of Sr₂IrO₄.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1251155

Alternate ID(s):: OSTI ID: 1234292

Journal Information:: Physical Review B, Vol. 93, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Evidence of Slater-type mechanism as origin of insulating state in Sr ₂ IrO ₄ Singh, Vijeta; Pulikkotil, J. J. Journal of Physics: Condensed Matter, Vol. 31, Issue 42 https://doi.org/10.1088/1361-648x/ab2841	journal	July 2019
The challenge of spin–orbit-tuned ground states in iridates: a key issues review Cao, Gang; Schlottmann, Pedro Reports on Progress in Physics, Vol. 81, Issue 4 https://doi.org/10.1088/1361-6633/aaa979	journal	February 2018
Superconducting current and low-energy states in a mesa-heterostructure interlayered with a strontium iridate film with strong spin-orbit interaction Petrzhik, A. M.; Constantinian, K. Y.; Ovsyannikov, G. A. Physical Review B, Vol. 100, Issue 2 https://doi.org/10.1103/physrevb.100.024501	journal	July 2019
Magnons and magnetodielectric effects in ${CoCr}_{2} O_{4}$ : Raman scattering studies Sethi, A.; Byrum, T.; McAuliffe, R. D. Physical Review B, Vol. 95, Issue 17 https://doi.org/10.1103/physrevb.95.174413	journal	May 2017
Evidence of Slater-type mechanism as origin of insulating state in Sr2IrO4 Singh, Vijeta; Pulikkotil, J. J. arXiv https://doi.org/10.48550/arxiv.1812.06241	text	January 2018

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Title: Isotropic and anisotropic regimes of the field-dependent spin dynamics in ${Sr}_{2} {IrO}_{4}$ : Raman scattering studies