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

Abstract

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.

Authors:

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)

Publication Date:: Mon Jan 11 00:00:00 EST 2016

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

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

OSTI Identifier:: 1251155

Alternate Identifier(s):: OSTI ID: 1234292

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 93; Journal Issue: 2; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Gim, Y., Sethi, A., Zhao, Q., Mitchell, J. F., Cao, G., and Cooper, S. L. Isotropic and anisotropic regimes of the field-dependent spin dynamics in Sr2IrO4: Raman scattering studies.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevB.93.024405.

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                    Gim, Y., Sethi, A., Zhao, Q., Mitchell, J. F., Cao, G., & Cooper, S. L. Isotropic and anisotropic regimes of the field-dependent spin dynamics in Sr2IrO4: Raman scattering studies.  United States.  https://doi.org/10.1103/PhysRevB.93.024405

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                    Gim, Y., Sethi, A., Zhao, Q., Mitchell, J. F., Cao, G., and Cooper, S. L. Mon .  
"Isotropic and anisotropic regimes of the field-dependent spin dynamics in Sr2IrO4: Raman scattering studies".  United States.  https://doi.org/10.1103/PhysRevB.93.024405.  https://www.osti.gov/servlets/purl/1251155.

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@article{osti_1251155,

  title        = {Isotropic and anisotropic regimes of the field-dependent spin dynamics in Sr2IrO4: Raman scattering studies},

  author       = {Gim, Y. and Sethi, A. and Zhao, Q. and Mitchell, J. F. and Cao, G. and Cooper, S. L.},

  abstractNote = {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.},

  doi          = {10.1103/PhysRevB.93.024405},

  journal      = {Physical Review B},

  number       = 2,

  volume       = 93,

  place        = {United States},

  year         = {Mon Jan 11 00:00:00 EST 2016},

  month        = {Mon Jan 11 00:00:00 EST 2016}

}

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

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

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Weak ferromagnetism, metal-to-nonmetal transition, and negative differential resistivity in single-crystal ${Sr}_{2} {IrO}_{4}$
journal, May 1998

Lattice-driven magnetoresistivity and metal-insulator transition in single-layered iridates
journal, September 2011

Magnetic and crystal structures of ${Sr}_{2} {IrO}_{4}$ : A neutron diffraction study
journal, April 2013

Electronic structures of layered perovskite ${Sr}_{2} M O_{4}$ ( $M = Ru$ , Rh, and Ir)
journal, September 2006

Magnetic Excitation Spectra of ${Sr}_{2} {IrO}_{4}$ Probed by Resonant Inelastic X-Ray Scattering: Establishing Links to Cuprate Superconductors
journal, April 2012

Structural and magnetic studies of ${Sr}_{2}$ ${IrO}_{4}$
journal, April 1994

Two-Dimensional Heisenberg Behavior of $J_{eff} = 1 / 2$ Isospins in the Paramagnetic State of the Spin-Orbital Mott Insulator ${Sr}_{2} {IrO}_{4}$
journal, June 2012

Low-energy magnetic excitations in the spin-orbital Mott insulator ${Sr}_{2} {IrO}_{4}$
journal, May 2014

Strong coupling theory of spin and orbital excitations in Sr $_{2}$ IrO $_{4}$
journal, September 2013

Magnetic excitation in resonant inelastic x-ray scattering of $Sr_{2}$ $IrO_{4}$ : A localized spin picture
journal, February 2014

Momentum-resolved electronic excitations in the Mott insulator ${Sr}_{2} {IrO}_{4}$ studied by resonant inelastic x-ray scattering
journal, March 2011

Probing single magnon excitations in Sr ₂ IrO ₄ using O K -edge resonant inelastic x-ray scattering
journal, April 2015

Low-frequency spin dynamics in the orthorhombic phase of La2CuO4
journal, October 2000

Magnetic Order in Lightly Doped ${L a}_{2 - x} {S r}_{x} {C u O}_{4}$
journal, July 2004

Field dependence of the magnetic spectrum in anisotropic and Dzyaloshinskii-Moriya antiferromagnets. I. Theory
journal, July 2006

Field dependence of the magnetic spectrum in anisotropic and Dzyaloshinskii-Moriya antiferromagnets. II. Raman spectroscopy
journal, July 2006

A short history of SHELX
journal, December 2007

Crossover from coherent to incoherent scattering in spin-orbit dominated Sr $_{2}$ IrO $_{4}$
journal, May 2012

Antisymmetric exchange and its influence on the magnetic structure and conductivity of ${La}_{2}$ Cu $O_{4}$
journal, July 1988

Light scattering from magnetic excitations in orthoferrites
journal, February 1982

Neutron scattering study of correlated phase behavior in Sr $_{2}$ IrO $_{4}$
journal, April 2013

Magnetoresistance and the spin-flop transition in single-crystal ${La}_{2}$ ${CuO}_{4 + y}$
journal, January 1990

Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
journal, January 2009

Nature of Spin-Reorientation Transitions
journal, April 1968

Theory of Magnetic Resonance in $α {Fe}_{2} O_{3}$
journal, July 1960

Neutron-scattering studies of spin waves in rare-earth orthoferrites
journal, September 1974

Field-induced spin reorientation in ${Eu}_{2}$ ${CuO}_{4}$ :Gd studied by magnetic resonance
journal, December 1993

Anisotropic Magnetoresistance in Antiferromagnetic ${Sr}_{2} {IrO}_{4}$
journal, November 2014

Microscopic Model for Reorientation of the Easy Axis of Magnetization
journal, November 1969

Raman Scattering from Magnon Excitations in RFeO ₃
journal, December 1988

Sound-Wave—Soft-Mode Interaction near Displacive Phase Transitions: Spin Reorientation in ErFe $O_{3}$
journal, November 1970

Giant magnetic response of a two-dimensional antiferromagnet
journal, June 2018

Evidence of Slater-type mechanism as origin of insulating state in Sr ₂ IrO ₄
journal, July 2019

The challenge of spin–orbit-tuned ground states in iridates: a key issues review
journal, February 2018

Superconducting current and low-energy states in a mesa-heterostructure interlayered with a strontium iridate film with strong spin-orbit interaction
journal, July 2019

Magnons and magnetodielectric effects in ${CoCr}_{2} O_{4}$ : Raman scattering studies
journal, May 2017

Evidence of Slater-type mechanism as origin of insulating state in Sr2IrO4
text, January 2018