Diffuse spin waves and classical spin liquid behavior in the kagomé antiferromagnet chromium jarosite, KCr3(O D)6(SO4)2

Sofie Holm-Janas; Sidse L. Lolk; Anders B.A. Andersen; Tatiana Guidi; David Voneshen; Ivica Živković; Ulla Gro Nielsen; Kim Lefmann

doi:10.1103/PhysRevB.108.064432

Diffuse spin waves and classical spin liquid behavior in the kagomé antiferromagnet chromium jarosite, KCr₃(O D)₆(SO₄)₂

Sofie Holm-Janas
, Sidse L. Lolk
, Anders B.A. Andersen
, Tatiana Guidi
, David Voneshen
, Ivica Živković
, Ulla Gro Nielsen
, Kim Lefmann

Department of Physics

University of Copenhagen
University of Southern Denmark
Rutherford Appleton Laboratory
Royal Holloway University of London
Swiss Federal Institute of Technology Lausanne

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

The dynamics of the S = 3/2 kagomé antiferromagnet chromium jarosite, KCr₃(OD)₆(SO₄)₂, was studied using high-resolution neutron time-of-flight spectroscopy on a polycrystalline sample with a nearly stoichiometric magnetic lattice [2.8(2)% Cr vacancies]. Neutron spectroscopy reveals diffuse spin wave excitations in the ordered phase with an incomplete gap and significant finite-lifetime broadening as well as a pronounced kagomé zero mode. Using linear spin wave theory, we estimate the exchange couplings. The system is highly two dimensional with the leading nearest-neighbor coupling being J₁=0.881 meV. Above T_N, diffuse excitations from the classical spin liquid regime dominate. We model the Q response and energy response separately and show that in both the ordered phase and the classical spin liquid regime they are strongly coupled.

Original language	English
Article number	064432
Journal	Physical Review B
Volume	108
Issue number	6
Number of pages	14
ISSN	2469-9950
DOIs	https://doi.org/10.1103/PhysRevB.108.064432
Publication status	Published - 2023

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@article{1e38ca7b10574c7e89a39eb3d7e59e73,

title = "Diffuse spin waves and classical spin liquid behavior in the kagom{\'e} antiferromagnet chromium jarosite, KCr3(O D)6(SO4)2",

abstract = "The dynamics of the S = 3/2 kagom{\'e} antiferromagnet chromium jarosite, KCr3(OD)6(SO4)2, was studied using high-resolution neutron time-of-flight spectroscopy on a polycrystalline sample with a nearly stoichiometric magnetic lattice [2.8(2)\% Cr vacancies]. Neutron spectroscopy reveals diffuse spin wave excitations in the ordered phase with an incomplete gap and significant finite-lifetime broadening as well as a pronounced kagom{\'e} zero mode. Using linear spin wave theory, we estimate the exchange couplings. The system is highly two dimensional with the leading nearest-neighbor coupling being J1=0.881 meV. Above TN, diffuse excitations from the classical spin liquid regime dominate. We model the Q response and energy response separately and show that in both the ordered phase and the classical spin liquid regime they are strongly coupled.",

author = "Sofie Holm-Janas and Lolk, \{Sidse L.\} and Andersen, \{Anders B.A.\} and Tatiana Guidi and David Voneshen and Ivica {\v Z}ivkovi{\'c} and Nielsen, \{Ulla Gro\} and Kim Lefmann",

note = "Publisher Copyright: {\textcopyright} 2023 American Physical Society.",

year = "2023",

doi = "10.1103/PhysRevB.108.064432",

language = "English",

volume = "108",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

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TY - JOUR

T1 - Diffuse spin waves and classical spin liquid behavior in the kagomé antiferromagnet chromium jarosite, KCr3(O D)6(SO4)2

AU - Holm-Janas, Sofie

AU - Lolk, Sidse L.

AU - Andersen, Anders B.A.

AU - Guidi, Tatiana

AU - Voneshen, David

AU - Živković, Ivica

AU - Nielsen, Ulla Gro

AU - Lefmann, Kim

PY - 2023

Y1 - 2023

N2 - The dynamics of the S = 3/2 kagomé antiferromagnet chromium jarosite, KCr3(OD)6(SO4)2, was studied using high-resolution neutron time-of-flight spectroscopy on a polycrystalline sample with a nearly stoichiometric magnetic lattice [2.8(2)% Cr vacancies]. Neutron spectroscopy reveals diffuse spin wave excitations in the ordered phase with an incomplete gap and significant finite-lifetime broadening as well as a pronounced kagomé zero mode. Using linear spin wave theory, we estimate the exchange couplings. The system is highly two dimensional with the leading nearest-neighbor coupling being J1=0.881 meV. Above TN, diffuse excitations from the classical spin liquid regime dominate. We model the Q response and energy response separately and show that in both the ordered phase and the classical spin liquid regime they are strongly coupled.

AB - The dynamics of the S = 3/2 kagomé antiferromagnet chromium jarosite, KCr3(OD)6(SO4)2, was studied using high-resolution neutron time-of-flight spectroscopy on a polycrystalline sample with a nearly stoichiometric magnetic lattice [2.8(2)% Cr vacancies]. Neutron spectroscopy reveals diffuse spin wave excitations in the ordered phase with an incomplete gap and significant finite-lifetime broadening as well as a pronounced kagomé zero mode. Using linear spin wave theory, we estimate the exchange couplings. The system is highly two dimensional with the leading nearest-neighbor coupling being J1=0.881 meV. Above TN, diffuse excitations from the classical spin liquid regime dominate. We model the Q response and energy response separately and show that in both the ordered phase and the classical spin liquid regime they are strongly coupled.

U2 - 10.1103/PhysRevB.108.064432

DO - 10.1103/PhysRevB.108.064432

M3 - Journal article

AN - SCOPUS:85172704245

SN - 2469-9950

VL - 108

JO - Physical Review B

JF - Physical Review B

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