Effect of random antiferromagnetic exchange on the spin waves in a three-dimensional Heisenberg ferromagnet
Neutron scattering is used to study spin waves in the three-dimensional Heisenberg ferromagnet YTiO3, with spin-spin exchange disorder introduced via La substitution at the Y site. No significant changes are observed in the spin-wave dispersion up to a La concentration of 20%. However, a strong broa...
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| Veröffentlicht in: | Physical review. B 2023-10, Vol.108 (13), Article 134406 |
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| container_title | Physical review. B |
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| creator | Hameed, S. Wang, Z. Gautreau, D. M. Joe, J. Olson, K. P. Chi, S. Gehring, P. M. Hong, T. Pajerowski, D. M. Williams, T. J. Xu, Z. Matsuda, M. Birol, T. Fernandes, R. M. Greven, M. |
| description | Neutron scattering is used to study spin waves in the three-dimensional Heisenberg ferromagnet YTiO3, with spin-spin exchange disorder introduced via La substitution at the Y site. No significant changes are observed in the spin-wave dispersion up to a La concentration of 20%. However, a strong broadening of the spectrum is found, indicative of shortened spin-wave lifetimes. Density-functional theory calculations predict minimal changes in exchange constants as a result of average structural changes due to La substitution, in agreement with the data. The absence of significant changes in the spin-wave dispersion, the considerable lifetime effect, and the reduced ordered magnetic moment previously observed in the La-substituted system are qualitatively captured by an isotropic, nearest-neighbor, three-dimensional Furthermore, Heisenberg ferromagnet model with random antiferromagnetic exchange. We therefore establish Y1-$x$La$x$TiO3 as a model system for the study of antiferromagnetic spin-exchange disorder in a three-dimensional Heisenberg ferromagnet. |
| doi_str_mv | 10.1103/PhysRevB.108.134406 |
| format | Article |
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M. ; Joe, J. ; Olson, K. P. ; Chi, S. ; Gehring, P. M. ; Hong, T. ; Pajerowski, D. M. ; Williams, T. J. ; Xu, Z. ; Matsuda, M. ; Birol, T. ; Fernandes, R. M. ; Greven, M.</creator><creatorcontrib>Hameed, S. ; Wang, Z. ; Gautreau, D. M. ; Joe, J. ; Olson, K. P. ; Chi, S. ; Gehring, P. M. ; Hong, T. ; Pajerowski, D. M. ; Williams, T. J. ; Xu, Z. ; Matsuda, M. ; Birol, T. ; Fernandes, R. M. ; Greven, M. ; Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)</creatorcontrib><description>Neutron scattering is used to study spin waves in the three-dimensional Heisenberg ferromagnet YTiO3, with spin-spin exchange disorder introduced via La substitution at the Y site. No significant changes are observed in the spin-wave dispersion up to a La concentration of 20%. However, a strong broadening of the spectrum is found, indicative of shortened spin-wave lifetimes. Density-functional theory calculations predict minimal changes in exchange constants as a result of average structural changes due to La substitution, in agreement with the data. The absence of significant changes in the spin-wave dispersion, the considerable lifetime effect, and the reduced ordered magnetic moment previously observed in the La-substituted system are qualitatively captured by an isotropic, nearest-neighbor, three-dimensional Furthermore, Heisenberg ferromagnet model with random antiferromagnetic exchange. We therefore establish Y1-$x$La$x$TiO3 as a model system for the study of antiferromagnetic spin-exchange disorder in a three-dimensional Heisenberg ferromagnet.</description><identifier>ISSN: 2469-9950</identifier><identifier>EISSN: 2469-9969</identifier><identifier>DOI: 10.1103/PhysRevB.108.134406</identifier><language>eng</language><publisher>United States: American Physical Society (APS)</publisher><subject>Antiferromagnetism ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; Condensed Matter, Materials & Applied Physics ; Ferromagnetism ; Inelastic neutron scattering ; Monte Carlo methods ; Spin dynamics</subject><ispartof>Physical review. 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We therefore establish Y1-$x$La$x$TiO3 as a model system for the study of antiferromagnetic spin-exchange disorder in a three-dimensional Heisenberg ferromagnet.</description><subject>Antiferromagnetism</subject><subject>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</subject><subject>Condensed Matter, Materials & Applied Physics</subject><subject>Ferromagnetism</subject><subject>Inelastic neutron scattering</subject><subject>Monte Carlo methods</subject><subject>Spin dynamics</subject><issn>2469-9950</issn><issn>2469-9969</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNpNkE9LAzEUxIMoWGo_gZfgfWv-7GaTo5ZqBUERPS_Z7Es32k1KEqr99m6piqc3DMMw74fQJSVzSgm_fu736QV2t3NK5JzysiTiBE1YKVShlFCnf7oi52iW0jshhAqiaqIm6GNpLZiMg8VR-y4MWPvsLMQYBr32kJ3B8GV67deAg8e5B5y2zuNPvYOER6FHLwIUnRvAJxe83uAVuAS-hbjG_6ou0JnVmwSznztFb3fL18WqeHy6f1jcPBaGMZGL0hom2k7oTlFLdCtMxxghVshxaSstkx0TTJY1aCKloFpBxTlUStS2rjrOp-jq2BtSdk0yLoPpTfB-fLQZq7ikhxA_hkwMKUWwzTa6Qcd9Q0lz4Nr8ch0N2Ry58m8d928H</recordid><startdate>20231005</startdate><enddate>20231005</enddate><creator>Hameed, S.</creator><creator>Wang, Z.</creator><creator>Gautreau, D. 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P.</au><au>Chi, S.</au><au>Gehring, P. M.</au><au>Hong, T.</au><au>Pajerowski, D. M.</au><au>Williams, T. J.</au><au>Xu, Z.</au><au>Matsuda, M.</au><au>Birol, T.</au><au>Fernandes, R. M.</au><au>Greven, M.</au><aucorp>Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of random antiferromagnetic exchange on the spin waves in a three-dimensional Heisenberg ferromagnet</atitle><jtitle>Physical review. B</jtitle><date>2023-10-05</date><risdate>2023</risdate><volume>108</volume><issue>13</issue><artnum>134406</artnum><issn>2469-9950</issn><eissn>2469-9969</eissn><abstract>Neutron scattering is used to study spin waves in the three-dimensional Heisenberg ferromagnet YTiO3, with spin-spin exchange disorder introduced via La substitution at the Y site. No significant changes are observed in the spin-wave dispersion up to a La concentration of 20%. 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| subjects | Antiferromagnetism CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Condensed Matter, Materials & Applied Physics Ferromagnetism Inelastic neutron scattering Monte Carlo methods Spin dynamics |
| title | Effect of random antiferromagnetic exchange on the spin waves in a three-dimensional Heisenberg ferromagnet |
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