Helical spin-waves, magnetic order, and fluctuations in the langasite compound Ba3NbFe3Si2O14
We have investigated the spin fluctuations in the langasite compound Ba3NbFe3Si2O14 in both the ordered state and as a function of temperature. The low temperature magnetic structure is defined by a spiral phase characterized by magnetic Bragg peaks at q=(0,0,tau ~ 1/7) onset at TN=27 K as previousl...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2010
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| _version_ | 1826262960680468480 |
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| author | Stock, C Chapon, L Schneidewind, A Su, Y Radaelli, P McMorrow, D Bombardi, A Lee, N Cheong, S |
| author_facet | Stock, C Chapon, L Schneidewind, A Su, Y Radaelli, P McMorrow, D Bombardi, A Lee, N Cheong, S |
| author_sort | Stock, C |
| collection | OXFORD |
| description | We have investigated the spin fluctuations in the langasite compound Ba3NbFe3Si2O14 in both the ordered state and as a function of temperature. The low temperature magnetic structure is defined by a spiral phase characterized by magnetic Bragg peaks at q=(0,0,tau ~ 1/7) onset at TN=27 K as previously reported by Marty et al. The nature of the fluctuations and temperature dependence of the order parameter is consistent with a classical second order phase transition for a two dimensional triangular antiferromagnet. We will show that the physical properties and energy scales including the ordering wavevector, Curie-Weiss temperature, and the spin-waves can be explained through the use of only symmetric exchange constants without the need for the Dzyaloshinskii-Moriya interaction. This is accomplished through a set of ``helical" exchange pathways along the c direction imposed by the chiral crystal structure and naturally explains the magnetic diffuse scattering which displays a strong vector chirality up to high temperatures well above the ordering temperature. This illustrates a strong coupling between magnetic and crystalline chirality in this compound. |
| first_indexed | 2024-03-06T19:44:06Z |
| format | Journal article |
| id | oxford-uuid:21ac8ce5-ec4f-4721-b5a7-f0b05475804c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:44:06Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:21ac8ce5-ec4f-4721-b5a7-f0b05475804c2022-03-26T11:34:41ZHelical spin-waves, magnetic order, and fluctuations in the langasite compound Ba3NbFe3Si2O14Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:21ac8ce5-ec4f-4721-b5a7-f0b05475804cEnglishSymplectic Elements at Oxford2010Stock, CChapon, LSchneidewind, ASu, YRadaelli, PMcMorrow, DBombardi, ALee, NCheong, SWe have investigated the spin fluctuations in the langasite compound Ba3NbFe3Si2O14 in both the ordered state and as a function of temperature. The low temperature magnetic structure is defined by a spiral phase characterized by magnetic Bragg peaks at q=(0,0,tau ~ 1/7) onset at TN=27 K as previously reported by Marty et al. The nature of the fluctuations and temperature dependence of the order parameter is consistent with a classical second order phase transition for a two dimensional triangular antiferromagnet. We will show that the physical properties and energy scales including the ordering wavevector, Curie-Weiss temperature, and the spin-waves can be explained through the use of only symmetric exchange constants without the need for the Dzyaloshinskii-Moriya interaction. This is accomplished through a set of ``helical" exchange pathways along the c direction imposed by the chiral crystal structure and naturally explains the magnetic diffuse scattering which displays a strong vector chirality up to high temperatures well above the ordering temperature. This illustrates a strong coupling between magnetic and crystalline chirality in this compound. |
| spellingShingle | Stock, C Chapon, L Schneidewind, A Su, Y Radaelli, P McMorrow, D Bombardi, A Lee, N Cheong, S Helical spin-waves, magnetic order, and fluctuations in the langasite compound Ba3NbFe3Si2O14 |
| title | Helical spin-waves, magnetic order, and fluctuations in the langasite
compound Ba3NbFe3Si2O14 |
| title_full | Helical spin-waves, magnetic order, and fluctuations in the langasite
compound Ba3NbFe3Si2O14 |
| title_fullStr | Helical spin-waves, magnetic order, and fluctuations in the langasite
compound Ba3NbFe3Si2O14 |
| title_full_unstemmed | Helical spin-waves, magnetic order, and fluctuations in the langasite
compound Ba3NbFe3Si2O14 |
| title_short | Helical spin-waves, magnetic order, and fluctuations in the langasite
compound Ba3NbFe3Si2O14 |
| title_sort | helical spin waves magnetic order and fluctuations in the langasite compound ba3nbfe3si2o14 |
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