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Title: Overdamped antiferromagnetic strange metal state in Sr3IrRuO7

Abstract

The unconventional electronic ground state of Sr 3IrRuO 7 is explored via resonant x-ray scattering techniques and angle-resolved photoemission measurements. As the Ru content approaches x = 0.5 in Sr 3(Ir 1-xRu x) 2O 7, intermediate to the J eff = 1/2 Mott state in Sr 3Ir 2O 7 and the quantum critical metal in Sr 3Ru 2O 7, 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 Sr 3Ir 2O 7 or Sr 3Ru 2O 7 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 Sr 3IrRuO 7.

Authors:
 [1];  [2];  [1];  [1];  [3];  [4];  [4];  [2];  [5];  [6];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Boston College, Chestnut Hill, MA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Tata Inst. of Fundamental Research, Mumbai (India)
  6. The Ohio State Univ., Columbus, OH (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); W.M. Keck Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1511279
Alternate Identifier(s):
OSTI ID: 1507236
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 15; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Schmehr, Julian L., Mion, Thomas R., Porter, Zach, Aling, Michael, Cao, Huibo, Upton, Mary H., Islam, Zahirul, He, Rui-Hua, Sensarma, Rajdeep, Trivedi, Nandini, and Wilson, Stephen D.. Overdamped antiferromagnetic strange metal state in Sr3IrRuO7. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.157201.
Schmehr, Julian L., Mion, Thomas R., Porter, Zach, Aling, Michael, Cao, Huibo, Upton, Mary H., Islam, Zahirul, He, Rui-Hua, Sensarma, Rajdeep, Trivedi, Nandini, & Wilson, Stephen D.. Overdamped antiferromagnetic strange metal state in Sr3IrRuO7. United States. doi:10.1103/PhysRevLett.122.157201.
Schmehr, Julian L., Mion, Thomas R., Porter, Zach, Aling, Michael, Cao, Huibo, Upton, Mary H., Islam, Zahirul, He, Rui-Hua, Sensarma, Rajdeep, Trivedi, Nandini, and Wilson, Stephen D.. Tue . "Overdamped antiferromagnetic strange metal state in Sr3IrRuO7". United States. doi:10.1103/PhysRevLett.122.157201.
@article{osti_1511279,
title = {Overdamped antiferromagnetic strange metal state in Sr3IrRuO7},
author = {Schmehr, Julian L. and Mion, Thomas R. and Porter, Zach and Aling, Michael and Cao, Huibo and Upton, Mary H. and Islam, Zahirul and He, Rui-Hua and Sensarma, Rajdeep and Trivedi, Nandini and Wilson, Stephen D.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.122.157201},
journal = {Physical Review Letters},
number = 15,
volume = 122,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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This content will become publicly available on April 16, 2020
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