Magnetic order, spin waves and fluctuations in the triangular antiferromagnet La2Ca2MnO7
We report magnetic susceptibility, specific heat and muon spin relaxation (muSR) experiments on the triangular antiferromagnet La2Ca2MnO7 which develops a genuine two-dimensional, three-sublattice \sqrt{3} \times \sqrt{3} magnetic order below T_N = 2.8 K. From the susceptibility and specific heat da...
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| creator | P Dalmas de Réotier Marin, C Yaouanc, A Douce, T Sikora, A Amato, A Baines, C |
| description | We report magnetic susceptibility, specific heat and muon spin relaxation (muSR) experiments on the triangular antiferromagnet La2Ca2MnO7 which develops a genuine two-dimensional, three-sublattice \sqrt{3} \times \sqrt{3} magnetic order below T_N = 2.8 K. From the susceptibility and specific heat data an estimate of the exchange interaction is derived. A value for the spin-wave gap is obtained from the latter data. The analysis of a previously reported inelastic neutron scattering study yields values for the exchange and spin-wave gap compatible with the results obtained from macroscopic measurements. An appreciable entropy is still missing at 10 K that may be ascribed to intense short-range correlations. The critical paramagnetic fluctuations extend far above T_N, and can be partly understood in terms of two-dimensional spin-wave excitations. While no spontaneous muSR field is observed below T_N, persistent spin dynamics is found. Short-range correlations are detected in this temperature range. Their relation to a possible molecular spin substructure and the observed exotic spin fluctuations is discussed. |
| doi_str_mv | 10.48550/arxiv.1507.01740 |
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From the susceptibility and specific heat data an estimate of the exchange interaction is derived. A value for the spin-wave gap is obtained from the latter data. The analysis of a previously reported inelastic neutron scattering study yields values for the exchange and spin-wave gap compatible with the results obtained from macroscopic measurements. An appreciable entropy is still missing at 10 K that may be ascribed to intense short-range correlations. The critical paramagnetic fluctuations extend far above T_N, and can be partly understood in terms of two-dimensional spin-wave excitations. While no spontaneous muSR field is observed below T_N, persistent spin dynamics is found. Short-range correlations are detected in this temperature range. 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From the susceptibility and specific heat data an estimate of the exchange interaction is derived. A value for the spin-wave gap is obtained from the latter data. The analysis of a previously reported inelastic neutron scattering study yields values for the exchange and spin-wave gap compatible with the results obtained from macroscopic measurements. An appreciable entropy is still missing at 10 K that may be ascribed to intense short-range correlations. The critical paramagnetic fluctuations extend far above T_N, and can be partly understood in terms of two-dimensional spin-wave excitations. While no spontaneous muSR field is observed below T_N, persistent spin dynamics is found. Short-range correlations are detected in this temperature range. Their relation to a possible molecular spin substructure and the observed exotic spin fluctuations is discussed.</description><subject>Antiferromagnetism</subject><subject>Heat exchange</subject><subject>Inelastic scattering</subject><subject>Magnetic permeability</subject><subject>Magnons</subject><subject>Muon spin relaxation</subject><subject>Neutron scattering</subject><subject>Neutrons</subject><subject>Physics - Strongly Correlated Electrons</subject><subject>Specific heat</subject><subject>Spin dynamics</subject><subject>Substructures</subject><subject>Variation</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotj81OAjEYRRsTEwnyAK5s4tbB_rcuDVExgbBh4W7yTWmxBDpj20F9e0dwdRf35OYehG4omQojJXmA9B2OUyqJnhKqBblAI8Y5rYxg7ApNct4RQpjSTEo-Qu9L2EZXgsVt2rh0j3MXIv6Co8sY4gb7fW9LDyW0MeOhKR8OlxQgbvs9pAEpwbuU2sNpBi-AzYAt40pfo0sP--wm_zlG65fn9WxeLVavb7OnRQWSqUprIUAbUMI76a0RTbOhoK1VmvLGO6s4UZwaqT2xitpHJ7lspDeeKi-U5mN0e549adddCgdIP_Wffn3SH4i7M9Gl9rN3udS7tk9x-FQzYjgTTGjFfwGVcF05</recordid><startdate>20150707</startdate><enddate>20150707</enddate><creator>P Dalmas de Réotier</creator><creator>Marin, C</creator><creator>Yaouanc, A</creator><creator>Douce, T</creator><creator>Sikora, A</creator><creator>Amato, A</creator><creator>Baines, C</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20150707</creationdate><title>Magnetic order, spin waves and fluctuations in the triangular antiferromagnet La2Ca2MnO7</title><author>P Dalmas de Réotier ; 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From the susceptibility and specific heat data an estimate of the exchange interaction is derived. A value for the spin-wave gap is obtained from the latter data. The analysis of a previously reported inelastic neutron scattering study yields values for the exchange and spin-wave gap compatible with the results obtained from macroscopic measurements. An appreciable entropy is still missing at 10 K that may be ascribed to intense short-range correlations. The critical paramagnetic fluctuations extend far above T_N, and can be partly understood in terms of two-dimensional spin-wave excitations. While no spontaneous muSR field is observed below T_N, persistent spin dynamics is found. Short-range correlations are detected in this temperature range. 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| subjects | Antiferromagnetism Heat exchange Inelastic scattering Magnetic permeability Magnons Muon spin relaxation Neutron scattering Neutrons Physics - Strongly Correlated Electrons Specific heat Spin dynamics Substructures Variation |
| title | Magnetic order, spin waves and fluctuations in the triangular antiferromagnet La2Ca2MnO7 |
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