Magnetic anisotropy of the alkali iridate Na2IrO3 at high magnetic fields: Evidence for strong ferromagnetic Kitaev correlations

Das, Sitikantha D.; Kundu, Sarbajaya; Zhu, Zengwei; Mun, Eundeok; McDonald, Ross D.; Li, Gang; Balicas, Luis; McCollam, Alix; Cao, Gang; Rau, Jeffrey G.; Kee, Hae-Young; Tripathi, Vikram; Sebastian, Suchitra E.

doi:10.1103/PhysRevB.99.081101

Title: Magnetic anisotropy of the alkali iridate Na₂IrO₃ at high magnetic fields: Evidence for strong ferromagnetic Kitaev correlations

Journal Article · Fri Feb 01 00:00:00 EST 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.081101· OSTI ID:1594228

Das, Sitikantha D. ^[1]; Kundu, Sarbajaya ^[2]; Zhu, Zengwei ^[3]; Mun, Eundeok ^[4]; McDonald, Ross D. ^[5]; Li, Gang ^[6]; Balicas, Luis ^[7]; McCollam, Alix ^[8]; Cao, Gang ^[9]; Rau, Jeffrey G. ^[10]; Kee, Hae-Young ^[11]; Tripathi, Vikram ^[2]; Sebastian, Suchitra E. ^[12]

Univ. of Cambridge (United Kingom); Indian Inst. of Technology (IIT), Kharagpur (India)
Tata Inst. of Fundamental Research, Mumbai (India)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Huazhong Univ. of Science and Technology, Wuhan (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Simon Fraser Univ., Burnaby, BC (Canada)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Chinese Academy of Science (CAS), Beijing (China)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Radboud Univ., Nijmegen (The Netherlands)
Univ. of Kentucky, Lexington, KY (United States); Univ. of Colorado, Boulder, CO (United States)
Univ. of Toronto, ON (Canada); Max Planck Inst. for the Physics of Complex Systems, Dresden (Germany)
Univ. of Toronto, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
Univ. of Cambridge (United Kingom)

The magnetic-field response of the Mott-insulating honeycomb iridate Na₂IrO₃ is investigated using torque magnetometry measurements in magnetic fields up to 60 T. A peak-dip structure is observed in the torque response at magnetic fields corresponding to an energy scale close to the zigzag ordering (≈15 K) temperature. Using exact diagonalization calculations, we show that such a distinctive signature in the torque response constrains the effective spin models for these classes of Kitaev materials to ones with dominant ferromagnetic Kitaev interactions, while alternative models with dominant antiferromagnetic Kitaev interactions are excluded. We further show that, at high magnetic fields, long range spin correlation functions decay rapidly, pointing to a transition to a long-sought-after field-induced quantum spin liquid beyond the peak-dip structure, suggesting this to be a common feature of the family of Kitaev systems. Finally, Kitaev systems are thus revealed to be excellent candidates for field-induced quantum spin liquids, similar physics having been suggested in another Kitaev system α-RuCl₃.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0002613; DMR-1712101

OSTI ID:: 1594228

Alternate ID(s):: OSTI ID: 1493110

Journal Information:: Physical Review B, Vol. 99, Issue 8; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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