Diffuse spin waves, zero modes and cluster excitations in the spin-3/2 kagomé antiferromagnet chromium jarosite, KCr\(_3\)(OD)\(_6\)(SO\(_4\))\(_2\)
The dynamics of the S = 3=2 kagome antiferromagnet chromium jarosite, KCr\(_3\)(OD)\(_6\)(SO\(_4\))\(_2\) 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 revea...
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| creator | Holm-Janas, Sofie Lolk, Sidse L Andersen, Anders B A Guidi, Tatiana Voneshen, David Zivkovic, Ivica Ulla Gro Nielsen Lefmann, Kim |
| description | The dynamics of the S = 3=2 kagome antiferromagnet chromium jarosite, KCr\(_3\)(OD)\(_6\)(SO\(_4\))\(_2\) 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 life-time broadening as well as a pronounced zero mode. Using linear spin wave theory, we estimate the exchange couplings, with the leading nearest neighbor value being \(J_1\) = 0:884 meV. Above \(T_N\) diffuse excitations from cooperative paramagnetism dominate. A model for two-dimensional magnetic cluster excitations is shown to capture the essential features of the data in the cooperative paramagnetic phase. |
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Neutron spectroscopy reveals diffuse spin wave excitations in the ordered phase with an incomplete gap and significant finite life-time broadening as well as a pronounced zero mode. Using linear spin wave theory, we estimate the exchange couplings, with the leading nearest neighbor value being \(J_1\) = 0:884 meV. Above \(T_N\) diffuse excitations from cooperative paramagnetism dominate. A model for two-dimensional magnetic cluster excitations is shown to capture the essential features of the data in the cooperative paramagnetic phase.</description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Antiferromagnetism ; Chromium ; Clusters ; Couplings ; Excitation ; Jarosite ; Lattice vacancies ; Lattice vibration ; Magnons ; Paramagnetism ; Two dimensional models</subject><ispartof>arXiv.org, 2023-08</ispartof><rights>2023. 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| subjects | Antiferromagnetism Chromium Clusters Couplings Excitation Jarosite Lattice vacancies Lattice vibration Magnons Paramagnetism Two dimensional models |
| title | Diffuse spin waves, zero modes and cluster excitations in the spin-3/2 kagomé antiferromagnet chromium jarosite, KCr\(_3\)(OD)\(_6\)(SO\(_4\))\(_2\) |
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