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Title: Coexistence of static and dynamic magnetism in the Kitaev spin liquid material Cu 2 IrO 3

Abstract

Searching for a Kitaev spin liquid phase motivated intense research on the honeycomb iridate materials. However, access to a spin liquid ground state has been hindered by magnetic ordering. Cu 2IrO 3 is a new honeycomb iridate without thermodynamic signatures of a long-range order. Here, we use muon spin relaxation to uncover the magnetic ground state of Cu 2IrO 3. We find a two-component depolarization with slow- and fast-relaxation rates corresponding to distinct regions with dynamic and static magnetism coexisting in the material. X-ray absorption spectroscopy and first-principles calculations identify a mixed copper valence as the origin of this behavior. Furthermore, our results suggest that a minority of Cu 2+ ions nucleate regions of static magnetism, whereas the majority of Cu +/Ir 4+ on the honeycomb lattice give rise to a Kitaev spin liquid.

Authors:
 [1];  [2];  [3];  [4];  [1];  [5];  [5];  [6];  [1];  [4];  [7];  [7];  [7];  [3];  [1]; ORCiD logo [1]
  1. Boston College, Chestnut Hill, MA (United States)
  2. Illinois Inst. of Technology, Chicago, IL (United States)
  3. Univ. Rennes, Rennes (France)
  4. Lab. CRISMAT, Caen (France)
  5. Rutherford Appleton Lab., Didcot (United Kingdom)
  6. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  7. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Agence Nationale de la recherche (ANR); National Science Foundation (NSF); United Kingdom Science and Technology Facilities Council; USDOE Office of Science (SC)
OSTI Identifier:
1579924
Alternate Identifier(s):
OSTI ID: 1561397
Grant/Contract Number:  
AC02-06CH11357; DMR–1708929
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Kenney, Eric M., Segre, Carlo U., Lafargue-Dit-Hauret, William, Lebedev, Oleg I., Abramchuk, Mykola, Berlie, Adam, Cottrell, Stephen P., Simutis, Gediminas, Bahrami, Faranak, Mordvinova, Natalia E., Fabbris, Gilberto, McChesney, Jessica. L., Haskel, Daniel, Rocquefelte, Xavier, Graf, Michael J., and Tafti, Fazel. Coexistence of static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.094418.
Kenney, Eric M., Segre, Carlo U., Lafargue-Dit-Hauret, William, Lebedev, Oleg I., Abramchuk, Mykola, Berlie, Adam, Cottrell, Stephen P., Simutis, Gediminas, Bahrami, Faranak, Mordvinova, Natalia E., Fabbris, Gilberto, McChesney, Jessica. L., Haskel, Daniel, Rocquefelte, Xavier, Graf, Michael J., & Tafti, Fazel. Coexistence of static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3. United States. doi:10.1103/PhysRevB.100.094418.
Kenney, Eric M., Segre, Carlo U., Lafargue-Dit-Hauret, William, Lebedev, Oleg I., Abramchuk, Mykola, Berlie, Adam, Cottrell, Stephen P., Simutis, Gediminas, Bahrami, Faranak, Mordvinova, Natalia E., Fabbris, Gilberto, McChesney, Jessica. L., Haskel, Daniel, Rocquefelte, Xavier, Graf, Michael J., and Tafti, Fazel. Thu . "Coexistence of static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3". United States. doi:10.1103/PhysRevB.100.094418.
@article{osti_1579924,
title = {Coexistence of static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3},
author = {Kenney, Eric M. and Segre, Carlo U. and Lafargue-Dit-Hauret, William and Lebedev, Oleg I. and Abramchuk, Mykola and Berlie, Adam and Cottrell, Stephen P. and Simutis, Gediminas and Bahrami, Faranak and Mordvinova, Natalia E. and Fabbris, Gilberto and McChesney, Jessica. L. and Haskel, Daniel and Rocquefelte, Xavier and Graf, Michael J. and Tafti, Fazel},
abstractNote = {Searching for a Kitaev spin liquid phase motivated intense research on the honeycomb iridate materials. However, access to a spin liquid ground state has been hindered by magnetic ordering. Cu2IrO3 is a new honeycomb iridate without thermodynamic signatures of a long-range order. Here, we use muon spin relaxation to uncover the magnetic ground state of Cu2IrO3. We find a two-component depolarization with slow- and fast-relaxation rates corresponding to distinct regions with dynamic and static magnetism coexisting in the material. X-ray absorption spectroscopy and first-principles calculations identify a mixed copper valence as the origin of this behavior. Furthermore, our results suggest that a minority of Cu2+ ions nucleate regions of static magnetism, whereas the majority of Cu+/Ir4+ on the honeycomb lattice give rise to a Kitaev spin liquid.},
doi = {10.1103/PhysRevB.100.094418},
journal = {Physical Review B},
number = 9,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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