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Effect of thermal lattice and magnetic disorder on phonons in bcc Fe: A first-principles study
Boston Coll, MA 02467 USA.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
Boston Coll, MA 02467 USA.
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 10, article id 104304Article in journal (Refereed) Published
Abstract [en]

We present a first-principles theoretical approach to calculate temperature dependent phonon dispersions in bcc Fe, which captures finite temperature spin-lattice coupling by treating thermal disorder in both the spin and lattice systems simultaneously. With increasing temperature, thermal atomic displacements are found to induce increasingly large fluctuations in local magnetic moment magnitudes. The calculated phonon dispersions of bcc Fe show excellent agreement with measured data over a wide range of temperatures both above and below the magnetic and structural transition temperatures, suggesting the applicability of the developed approach to other magnetic materials.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 10, article id 104304
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-160589DOI: 10.1103/PhysRevB.100.104304ISI: 000485311800002OAI: oai:DiVA.org:liu-160589DiVA, id: diva2:1362722
Note

Funding Agencies|National Science Foundation EFRI 2-DARE program [1433467]; Boston College dissertation fellowship award; National Science FoundationNational Science Foundation (NSF) [ACI-1548562]; NSFNational Science Foundation (NSF) [ACI-1445606]

Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2019-12-06

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