Magnetic structure driven by monoclinic distortions in the double perovskite Sr2YRuO6
The monoclinic double perovskite Sr _2 YRuO _6 has recently gained a renewed interest in order to get a deeper insight into the exotic magnetic ground states associated with geometric frustration. Striking discrepancies between the spin order derived from the neutron diffraction refinements and the...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2015-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/17/10/103007 |
| _version_ | 1797751123848724480 |
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| author | P L Bernardo L Ghivelder H S Amorim J J Neumeier S García |
| author_facet | P L Bernardo L Ghivelder H S Amorim J J Neumeier S García |
| author_sort | P L Bernardo |
| collection | DOAJ |
| description | The monoclinic double perovskite Sr _2 YRuO _6 has recently gained a renewed interest in order to get a deeper insight into the exotic magnetic ground states associated with geometric frustration. Striking discrepancies between the spin order derived from the neutron diffraction refinements and the macroscopic magnetic and thermal responses is a major challenge that must be addressed. In this work, detailed neutron diffraction measurements as a function of temperature yield a completely different interpretation of the patterns. We show that at low temperatures a spin structure of the K _2 NiF _4 -type is an accessible configuration for the magnetic ground state. In the neighborhood of the magnetic transition, this configuration evolves into a canted superstructure. The deduced temperature dependence of the canting angle exhibits two closely spaced peaks, which are in excellent agreement with the double peaks in the magnetic contribution to the specific heat and in the thermal expansion coefficient. We explain these features in terms of reorientation of the net ferromagnetic moment of the noncollinear spin state, due to the local breaking of the inversion symmetry promoted by the monoclinic distortions, with structural changes acting as the driving force. |
| first_indexed | 2024-03-12T16:42:52Z |
| format | Article |
| id | doaj.art-c4c8f1aa095b456b9a32da2e4870bdf5 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:42:52Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-c4c8f1aa095b456b9a32da2e4870bdf52023-08-08T14:22:46ZengIOP PublishingNew Journal of Physics1367-26302015-01-01171010300710.1088/1367-2630/17/10/103007Magnetic structure driven by monoclinic distortions in the double perovskite Sr2YRuO6P L Bernardo0L Ghivelder1H S Amorim2J J Neumeier3S García4Instituto de Física, Universidade Federal do Rio de Janeiro , Rio de Janeiro, 21941-972, BrazilInstituto de Física, Universidade Federal do Rio de Janeiro , Rio de Janeiro, 21941-972, BrazilInstituto de Física, Universidade Federal do Rio de Janeiro , Rio de Janeiro, 21941-972, BrazilDepartment of Physics, Montana State University , Bozeman, MT 59717-3840, USAInstituto de Física, Universidade Federal do Rio de Janeiro , Rio de Janeiro, 21941-972, BrazilThe monoclinic double perovskite Sr _2 YRuO _6 has recently gained a renewed interest in order to get a deeper insight into the exotic magnetic ground states associated with geometric frustration. Striking discrepancies between the spin order derived from the neutron diffraction refinements and the macroscopic magnetic and thermal responses is a major challenge that must be addressed. In this work, detailed neutron diffraction measurements as a function of temperature yield a completely different interpretation of the patterns. We show that at low temperatures a spin structure of the K _2 NiF _4 -type is an accessible configuration for the magnetic ground state. In the neighborhood of the magnetic transition, this configuration evolves into a canted superstructure. The deduced temperature dependence of the canting angle exhibits two closely spaced peaks, which are in excellent agreement with the double peaks in the magnetic contribution to the specific heat and in the thermal expansion coefficient. We explain these features in terms of reorientation of the net ferromagnetic moment of the noncollinear spin state, due to the local breaking of the inversion symmetry promoted by the monoclinic distortions, with structural changes acting as the driving force.https://doi.org/10.1088/1367-2630/17/10/103007magnetic structureneutron diffractionperovskite75.25.-j75.50.Ee61.05.fg |
| spellingShingle | P L Bernardo L Ghivelder H S Amorim J J Neumeier S García Magnetic structure driven by monoclinic distortions in the double perovskite Sr2YRuO6 New Journal of Physics magnetic structure neutron diffraction perovskite 75.25.-j 75.50.Ee 61.05.fg |
| title | Magnetic structure driven by monoclinic distortions in the double perovskite Sr2YRuO6 |
| title_full | Magnetic structure driven by monoclinic distortions in the double perovskite Sr2YRuO6 |
| title_fullStr | Magnetic structure driven by monoclinic distortions in the double perovskite Sr2YRuO6 |
| title_full_unstemmed | Magnetic structure driven by monoclinic distortions in the double perovskite Sr2YRuO6 |
| title_short | Magnetic structure driven by monoclinic distortions in the double perovskite Sr2YRuO6 |
| title_sort | magnetic structure driven by monoclinic distortions in the double perovskite sr2yruo6 |
| topic | magnetic structure neutron diffraction perovskite 75.25.-j 75.50.Ee 61.05.fg |
| url | https://doi.org/10.1088/1367-2630/17/10/103007 |
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