Overdamped Antiferromagnetic Strange Metal State in Sr3IrRuO7

Julian L. Schmehr; Thomas R. Mion; Zach Porter; Michael Aling; Huibo Cao; Mary H. Upton; Zahirul Islam; Rui Hua He; Rajdeep Sensarma; Nandini Trivedi; Stephen D. Wilson

doi:10.1103/PhysRevLett.122.157201

Overdamped Antiferromagnetic Strange Metal State in Sr3IrRuO7

Julian L. Schmehr, Thomas R. Mion, Zach Porter, Michael Aling, Huibo Cao, Mary H. Upton, Zahirul Islam, Rui Hua He, Rajdeep Sensarma, Nandini Trivedi, Stephen D. Wilson

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The unconventional electronic ground state of Sr3IrRuO7 is explored via resonant x-ray scattering techniques and angle-resolved photoemission measurements. As the Ru content approaches x=0.5 in Sr3(Ir1-xRux)2O7, intermediate to the Jeff=1/2 Mott state in Sr3Ir2O7 and the quantum critical metal in Sr3Ru2O7, a thermodynamically distinct metallic state emerges. The electronic structure of this intermediate phase lacks coherent quasiparticles, and charge transport exhibits a linear temperature dependence over a wide range of temperatures. Spin dynamics associated with the long-range antiferromagnetism of this phase show nearly local, overdamped magnetic excitations and an anomalously large energy scale of 200 meV - an energy far in excess of exchange energies present within either the Sr3Ir2O7 or Sr3Ru2O7 solid-solution end points. Overdamped quasiparticle dynamics driven by strong spin-charge coupling are proposed to explain the incoherent spectral features of the strange metal state in Sr3IrRuO7.

Original language	English
Article number	157201
Journal	Physical Review Letters
Volume	122
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.122.157201
State	Published - Apr 16 2019

Funding

This work was primarily supported by NSF Grant No. DMR-1505549 (S. D. W). Additional funding support was provided by ARO Grant No. W911NF-16-1-0361 (J. L. S. and Z. P.) and the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1258923 (T. R. M.). J. L. S., M. A., and S. D. W. also gratefully acknowledge funding from the W. M. Keck Foundation. The MRL Shared Experimental Facilities are supported by the MRSEC Program of the NSF under Award No. DMR 1720256, a member of the NSF-funded Materials Research Facilities Network. The work at ORNL’s HFIR was sponsored by the Scientific User Facilities Division, Office of Science, Basic Energy Sciences, U.S. Department of Energy. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

Funders	Funder number
NSF-funded
Scientific User Facilities Division
National Science Foundation	DGE-1258923, DMR-1505549, 1720256, 1258923, 1505549
U.S. Department of Energy
Army Research Office	W911NF-16-1-0361
W. M. Keck Foundation
Office of Science
Basic Energy Sciences
Argonne National Laboratory	DE-AC02-06CH11357
Materials Research Science and Engineering Center, Harvard University	DMR 1720256

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10.1103/PhysRevLett.122.157201

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title = "Overdamped Antiferromagnetic Strange Metal State in Sr3IrRuO7",

abstract = "The unconventional electronic ground state of Sr3IrRuO7 is explored via resonant x-ray scattering techniques and angle-resolved photoemission measurements. As the Ru content approaches x=0.5 in Sr3(Ir1-xRux)2O7, intermediate to the Jeff=1/2 Mott state in Sr3Ir2O7 and the quantum critical metal in Sr3Ru2O7, a thermodynamically distinct metallic state emerges. The electronic structure of this intermediate phase lacks coherent quasiparticles, and charge transport exhibits a linear temperature dependence over a wide range of temperatures. Spin dynamics associated with the long-range antiferromagnetism of this phase show nearly local, overdamped magnetic excitations and an anomalously large energy scale of 200 meV - an energy far in excess of exchange energies present within either the Sr3Ir2O7 or Sr3Ru2O7 solid-solution end points. Overdamped quasiparticle dynamics driven by strong spin-charge coupling are proposed to explain the incoherent spectral features of the strange metal state in Sr3IrRuO7.",

author = "Schmehr, {Julian L.} and Mion, {Thomas R.} and Zach Porter and Michael Aling and Huibo Cao and Upton, {Mary H.} and Zahirul Islam and He, {Rui Hua} and Rajdeep Sensarma and Nandini Trivedi and Wilson, {Stephen D.}",

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AU - Aling, Michael

AU - Cao, Huibo

AU - Upton, Mary H.

AU - Islam, Zahirul

AU - He, Rui Hua

AU - Sensarma, Rajdeep

AU - Trivedi, Nandini

AU - Wilson, Stephen D.

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N2 - The unconventional electronic ground state of Sr3IrRuO7 is explored via resonant x-ray scattering techniques and angle-resolved photoemission measurements. As the Ru content approaches x=0.5 in Sr3(Ir1-xRux)2O7, intermediate to the Jeff=1/2 Mott state in Sr3Ir2O7 and the quantum critical metal in Sr3Ru2O7, a thermodynamically distinct metallic state emerges. The electronic structure of this intermediate phase lacks coherent quasiparticles, and charge transport exhibits a linear temperature dependence over a wide range of temperatures. Spin dynamics associated with the long-range antiferromagnetism of this phase show nearly local, overdamped magnetic excitations and an anomalously large energy scale of 200 meV - an energy far in excess of exchange energies present within either the Sr3Ir2O7 or Sr3Ru2O7 solid-solution end points. Overdamped quasiparticle dynamics driven by strong spin-charge coupling are proposed to explain the incoherent spectral features of the strange metal state in Sr3IrRuO7.

AB - The unconventional electronic ground state of Sr3IrRuO7 is explored via resonant x-ray scattering techniques and angle-resolved photoemission measurements. As the Ru content approaches x=0.5 in Sr3(Ir1-xRux)2O7, intermediate to the Jeff=1/2 Mott state in Sr3Ir2O7 and the quantum critical metal in Sr3Ru2O7, a thermodynamically distinct metallic state emerges. The electronic structure of this intermediate phase lacks coherent quasiparticles, and charge transport exhibits a linear temperature dependence over a wide range of temperatures. Spin dynamics associated with the long-range antiferromagnetism of this phase show nearly local, overdamped magnetic excitations and an anomalously large energy scale of 200 meV - an energy far in excess of exchange energies present within either the Sr3Ir2O7 or Sr3Ru2O7 solid-solution end points. Overdamped quasiparticle dynamics driven by strong spin-charge coupling are proposed to explain the incoherent spectral features of the strange metal state in Sr3IrRuO7.

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Overdamped Antiferromagnetic Strange Metal State in Sr3IrRuO7

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