Spin and phonon response in uranium compounds
Recent progress in understanding the spin localization and moment formation in metallic uranium compounds is summarized. Measurements have been made of the neutron scattering from UN, US, UTe and UPd3. The phonon spectra are unusual e.g. the (111) TA branch of UTe lies below the (111) TA branch from...
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| Veröffentlicht in: | J. Appl. Phys.; (United States) 1981-03, Vol.52 (3), p.2222-2224 |
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| container_title | J. Appl. Phys.; (United States) |
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| creator | Buyers, W. J. L. Murray, A. F. Jackman, J. A. Holden, T. M. DuPlessis, P. de V. Vogt, O. |
| description | Recent progress in understanding the spin localization and moment formation in metallic uranium compounds is summarized. Measurements have been made of the neutron scattering from UN, US, UTe and UPd3. The phonon spectra are unusual e.g. the (111) TA branch of UTe lies below the (111) TA branch from ζ = 0.2 to the zone boundary. Force-constant analysis of the UX series shows that when the U-U forces are large the moment is small. In non-ordering UPd3 the high-frequency band of crystal-field-like excitations is well described by a localized spin model. The low-frequency band (ν∼0.4 THz) is broadened, however, suggesting a delicate balance in the spin localization. In antiferromagnetic UN, where the U-U overlap is greater, the spin response is entirely broad with a large anisotropy gap. Ferromagnetic UTe has a quadratically rising spin-wave branch as well as a higher flat branch. Thus UPd3 and UTe provide clear evidence for the existence of crystalline electric fields in metallic actinide compounds. |
| doi_str_mv | 10.1063/1.328885 |
| format | Article |
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In antiferromagnetic UN, where the U-U overlap is greater, the spin response is entirely broad with a large anisotropy gap. Ferromagnetic UTe has a quadratically rising spin-wave branch as well as a higher flat branch. 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The low-frequency band (ν∼0.4 THz) is broadened, however, suggesting a delicate balance in the spin localization. In antiferromagnetic UN, where the U-U overlap is greater, the spin response is entirely broad with a large anisotropy gap. Ferromagnetic UTe has a quadratically rising spin-wave branch as well as a higher flat branch. 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J. L.</creatorcontrib><creatorcontrib>Murray, A. F.</creatorcontrib><creatorcontrib>Jackman, J. A.</creatorcontrib><creatorcontrib>Holden, T. M.</creatorcontrib><creatorcontrib>DuPlessis, P. de V.</creatorcontrib><creatorcontrib>Vogt, O.</creatorcontrib><creatorcontrib>Atomic Energy of Canada Limited, Chalk River, Ontario, Canada K0J 1J0</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>J. Appl. Phys.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Buyers, W. J. L.</au><au>Murray, A. F.</au><au>Jackman, J. A.</au><au>Holden, T. M.</au><au>DuPlessis, P. de V.</au><au>Vogt, O.</au><aucorp>Atomic Energy of Canada Limited, Chalk River, Ontario, Canada K0J 1J0</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spin and phonon response in uranium compounds</atitle><jtitle>J. Appl. Phys.; (United States)</jtitle><date>1981-03-01</date><risdate>1981</risdate><volume>52</volume><issue>3</issue><spage>2222</spage><epage>2224</epage><pages>2222-2224</pages><issn>0021-8979</issn><eissn>1089-7550</eissn><abstract>Recent progress in understanding the spin localization and moment formation in metallic uranium compounds is summarized. Measurements have been made of the neutron scattering from UN, US, UTe and UPd3. The phonon spectra are unusual e.g. the (111) TA branch of UTe lies below the (111) TA branch from ζ = 0.2 to the zone boundary. Force-constant analysis of the UX series shows that when the U-U forces are large the moment is small. In non-ordering UPd3 the high-frequency band of crystal-field-like excitations is well described by a localized spin model. The low-frequency band (ν∼0.4 THz) is broadened, however, suggesting a delicate balance in the spin localization. In antiferromagnetic UN, where the U-U overlap is greater, the spin response is entirely broad with a large anisotropy gap. Ferromagnetic UTe has a quadratically rising spin-wave branch as well as a higher flat branch. Thus UPd3 and UTe provide clear evidence for the existence of crystalline electric fields in metallic actinide compounds.</abstract><cop>United States</cop><doi>10.1063/1.328885</doi><tpages>3</tpages><oa>free_for_read</oa></addata></record> |
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| identifier | ISSN: 0021-8979 |
| ispartof | J. Appl. Phys.; (United States), 1981-03, Vol.52 (3), p.2222-2224 |
| issn | 0021-8979 1089-7550 |
| language | eng |
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| source | AIP Digital Archive |
| subjects | 360104 - Metals & Alloys- Physical Properties ACTINIDE COMPOUNDS ANISOTROPY CHALCOGENIDES COHERENT SCATTERING CRYSTAL FIELD DIFFRACTION ELECTRIC FIELDS MATERIALS SCIENCE NEUTRON DIFFRACTION NITRIDES NITROGEN COMPOUNDS PALLADIUM COMPOUNDS PHONONS PNICTIDES QUASI PARTICLES SCATTERING SPIN WAVES SULFIDES SULFUR COMPOUNDS TELLURIDES TELLURIUM COMPOUNDS TRANSITION ELEMENT COMPOUNDS URANIUM COMPOUNDS URANIUM NITRIDES URANIUM SULFIDES URANIUM TELLURIDES |
| title | Spin and phonon response in uranium compounds |
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