Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet

Q. Huang; R. Rawl; W. W. Xie; E. S. Chou; V. S. Zapf; X. X. Ding; C. Mauws; C. R. Wiebe; E. X. Feng; H. B. Cao; W. Tian; J. Ma; Y. Qiu; N. Butch; H. D. Zhou

doi:10.1088/1361-648X/ac5703

Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet

Q. Huang, R. Rawl, W. W. Xie, E. S. Chou, V. S. Zapf, X. X. Ding, C. Mauws, C. R. Wiebe, E. X. Feng, H. B. Cao, W. Tian, J. Ma, Y. Qiu, N. Butch, H. D. Zhou

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

2 Scopus citations

Abstract

With the motivation to study how non-magnetic ion site disorder affects the quantum magnetism of Ba3CoSb2O9, a spin-1/2 equilateral triangular lattice antiferromagnet, we performed DC and AC susceptibility, specific heat, elastic and inelastic neutron scattering measurements on single crystalline samples of Ba2.87Sr0.13CoSb2O9 with Sr doping on non-magnetic Ba2+ ion sites. The results show that Ba2.87Sr0.13CoSb2O9 exhibits (i) a two-step magnetic transition at 2.7 K and 3.3 K, respectively; (ii) a possible canted 120 degree spin structure at zero field with reduced ordered moment as 1.24 μ B/Co; (iii) a series of spin state transitions for both H ab-plane and H c-axis. For H ab-plane, the magnetization plateau feature related to the up-up-down phase is significantly suppressed; (iv) an inelastic neutron scattering spectrum with only one gapped mode at zero field, which splits to one gapless and one gapped mode at 9 T. All these features are distinctly different from those observed for the parent compound Ba3CoSb2O9, which demonstrates that the non-magnetic ion site disorder (the Sr doping) plays a complex role on the magnetic properties beyond the conventionally expected randomization of the exchange interactions. We propose the additional effects including the enhancement of quantum spin fluctuations and introduction of a possible spatial anisotropy through the local structural distortions.

Original language	English
Article number	205401
Journal	Journal of Physics Condensed Matter
Volume	34
Issue number	20
DOIs	https://doi.org/10.1088/1361-648X/ac5703
State	Published - May 18 2022

Funding

QH and HDZ thank the support from NSF-DMR through Award DMR-2003117. A portion of this work was performed at the NHMFL, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490, the US Department of Energy, and the State of Florida. EF and HBC acknowledge the support of US DOE BES Early Career Award No. KC0402020 under Contract No. DE-AC05-00OR22725. CRW thanks the support from the National Science and Engineering Research Council of Canada (NSERC), and the Canadian Foundation for Innovation (CFI),and the Canada Research Chair programme (Tier II). CM thanks the support from NSERC. WX was supported by Beckman Young Investigator Award. This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Access to MACS was provided by the Center for High Resolution Neutron Scattering, a partnership between the National Institute of Standards and Technology and the National Science Foundation under Agreement No. DMR-1508249. JM thanks the National Science Foundation of China (No. 11774223 and U2032213). The authors thank Martin Mourigal and his research group for providing help in susceptibility measurements. The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology.

Funders	Funder number
NSF-DMR	DMR-2003117
State of Florida
US DOE BES	DE-AC05-00OR22725, KC0402020
National Science Foundation	DMR-1157490
U.S. Department of Energy
National Institute of Standards and Technology	DMR-1508249
Natural Sciences and Engineering Research Council of Canada
Canada Foundation for Innovation
Canada Research Chairs
National Natural Science Foundation of China	U2032213, 11774223

Keywords

geometrically frustrated magnet
phase transitions
site disorder

Access to Document

10.1088/1361-648X/ac5703

Cite this

Huang, Q., Rawl, R., Xie, W. W., Chou, E. S., Zapf, V. S., Ding, X. X., Mauws, C., Wiebe, C. R., Feng, E. X., Cao, H. B., Tian, W., Ma, J., Qiu, Y., Butch, N., & Zhou, H. D. (2022). Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet. Journal of Physics Condensed Matter, 34(20), Article 205401. https://doi.org/10.1088/1361-648X/ac5703

@article{2e0d9c84cbb24bafbeae31114b79a523,

title = "Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet",

abstract = "With the motivation to study how non-magnetic ion site disorder affects the quantum magnetism of Ba3CoSb2O9, a spin-1/2 equilateral triangular lattice antiferromagnet, we performed DC and AC susceptibility, specific heat, elastic and inelastic neutron scattering measurements on single crystalline samples of Ba2.87Sr0.13CoSb2O9 with Sr doping on non-magnetic Ba2+ ion sites. The results show that Ba2.87Sr0.13CoSb2O9 exhibits (i) a two-step magnetic transition at 2.7 K and 3.3 K, respectively; (ii) a possible canted 120 degree spin structure at zero field with reduced ordered moment as 1.24 μ B/Co; (iii) a series of spin state transitions for both H ab-plane and H c-axis. For H ab-plane, the magnetization plateau feature related to the up-up-down phase is significantly suppressed; (iv) an inelastic neutron scattering spectrum with only one gapped mode at zero field, which splits to one gapless and one gapped mode at 9 T. All these features are distinctly different from those observed for the parent compound Ba3CoSb2O9, which demonstrates that the non-magnetic ion site disorder (the Sr doping) plays a complex role on the magnetic properties beyond the conventionally expected randomization of the exchange interactions. We propose the additional effects including the enhancement of quantum spin fluctuations and introduction of a possible spatial anisotropy through the local structural distortions.",

keywords = "geometrically frustrated magnet, phase transitions, site disorder",

author = "Q. Huang and R. Rawl and Xie, {W. W.} and Chou, {E. S.} and Zapf, {V. S.} and Ding, {X. X.} and C. Mauws and Wiebe, {C. R.} and Feng, {E. X.} and Cao, {H. B.} and W. Tian and J. Ma and Y. Qiu and N. Butch and Zhou, {H. D.}",

note = "Publisher Copyright: {\textcopyright} 2022 IOP Publishing Ltd.",

year = "2022",

month = may,

day = "18",

doi = "10.1088/1361-648X/ac5703",

language = "English",

volume = "34",

journal = "Journal of Physics Condensed Matter",

issn = "0953-8984",

publisher = "IOP Publishing",

number = "20",

}

Huang, Q, Rawl, R, Xie, WW, Chou, ES, Zapf, VS, Ding, XX, Mauws, C, Wiebe, CR, Feng, EX, Cao, HB , Tian, W, Ma, J, Qiu, Y, Butch, N & Zhou, HD 2022, 'Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet', Journal of Physics Condensed Matter, vol. 34, no. 20, 205401. https://doi.org/10.1088/1361-648X/ac5703

TY - JOUR

T1 - Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet

AU - Huang, Q.

AU - Rawl, R.

AU - Xie, W. W.

AU - Chou, E. S.

AU - Zapf, V. S.

AU - Ding, X. X.

AU - Mauws, C.

AU - Wiebe, C. R.

AU - Feng, E. X.

AU - Cao, H. B.

AU - Tian, W.

AU - Ma, J.

AU - Qiu, Y.

AU - Butch, N.

AU - Zhou, H. D.

PY - 2022/5/18

Y1 - 2022/5/18

N2 - With the motivation to study how non-magnetic ion site disorder affects the quantum magnetism of Ba3CoSb2O9, a spin-1/2 equilateral triangular lattice antiferromagnet, we performed DC and AC susceptibility, specific heat, elastic and inelastic neutron scattering measurements on single crystalline samples of Ba2.87Sr0.13CoSb2O9 with Sr doping on non-magnetic Ba2+ ion sites. The results show that Ba2.87Sr0.13CoSb2O9 exhibits (i) a two-step magnetic transition at 2.7 K and 3.3 K, respectively; (ii) a possible canted 120 degree spin structure at zero field with reduced ordered moment as 1.24 μ B/Co; (iii) a series of spin state transitions for both H ab-plane and H c-axis. For H ab-plane, the magnetization plateau feature related to the up-up-down phase is significantly suppressed; (iv) an inelastic neutron scattering spectrum with only one gapped mode at zero field, which splits to one gapless and one gapped mode at 9 T. All these features are distinctly different from those observed for the parent compound Ba3CoSb2O9, which demonstrates that the non-magnetic ion site disorder (the Sr doping) plays a complex role on the magnetic properties beyond the conventionally expected randomization of the exchange interactions. We propose the additional effects including the enhancement of quantum spin fluctuations and introduction of a possible spatial anisotropy through the local structural distortions.

AB - With the motivation to study how non-magnetic ion site disorder affects the quantum magnetism of Ba3CoSb2O9, a spin-1/2 equilateral triangular lattice antiferromagnet, we performed DC and AC susceptibility, specific heat, elastic and inelastic neutron scattering measurements on single crystalline samples of Ba2.87Sr0.13CoSb2O9 with Sr doping on non-magnetic Ba2+ ion sites. The results show that Ba2.87Sr0.13CoSb2O9 exhibits (i) a two-step magnetic transition at 2.7 K and 3.3 K, respectively; (ii) a possible canted 120 degree spin structure at zero field with reduced ordered moment as 1.24 μ B/Co; (iii) a series of spin state transitions for both H ab-plane and H c-axis. For H ab-plane, the magnetization plateau feature related to the up-up-down phase is significantly suppressed; (iv) an inelastic neutron scattering spectrum with only one gapped mode at zero field, which splits to one gapless and one gapped mode at 9 T. All these features are distinctly different from those observed for the parent compound Ba3CoSb2O9, which demonstrates that the non-magnetic ion site disorder (the Sr doping) plays a complex role on the magnetic properties beyond the conventionally expected randomization of the exchange interactions. We propose the additional effects including the enhancement of quantum spin fluctuations and introduction of a possible spatial anisotropy through the local structural distortions.

KW - geometrically frustrated magnet

KW - phase transitions

KW - site disorder

UR - http://www.scopus.com/inward/record.url?scp=85126490944&partnerID=8YFLogxK

U2 - 10.1088/1361-648X/ac5703

DO - 10.1088/1361-648X/ac5703

M3 - Article

C2 - 35189602

AN - SCOPUS:85126490944

SN - 0953-8984

VL - 34

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

IS - 20

M1 - 205401

ER -

Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this