Stabilization of an ambient-pressure collapsed tetragonal phase in CaFe2As2 and tuning of the orthorhombic-antiferromagnetic transition temperature by over 70 K via control of nanoscale precipitates

dc.contributor.author Ran, Sheng
dc.contributor.author Bud’ko, Sergey
dc.contributor.author Pratt, D. K.
dc.contributor.author Kreyssig, Andreas
dc.contributor.author Kim, M. G.
dc.contributor.author Kramer, Matthew
dc.contributor.author Ryan, D. H.
dc.contributor.author Rowan-Weetaluktuk, W. N.
dc.contributor.author Furukawa, Y.
dc.contributor.author Roy, B.
dc.contributor.author Goldman, Alan
dc.contributor.author Canfield, Paul
dc.contributor.department Ames National Laboratory
dc.contributor.department Physics and Astronomy
dc.contributor.department Materials Science and Engineering
dc.date 2020-04-20T16:50:48.000
dc.date.accessioned 2020-06-30T06:21:37Z
dc.date.available 2020-06-30T06:21:37Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2011
dc.date.issued 2011-04-01
dc.description.abstract <p>We have found a remarkably large response of the transition temperature of CaFe2As2 single crystals grown from excess FeAs to annealing and quenching temperature. Whereas crystals that are annealed at 400ˆC exhibit a first-order phase transition from a high-temperature tetragonal to a low-temperature orthorhombic and antiferromagnetic state near 170 K, crystals that have been quenched from 960ˆC exhibit a transition from a high-temperature tetragonal phase to a low-temperature, nonmagnetic, collapsed tetragonal phase below 100 K. By use of temperature-dependent electrical resistivity, magnetic susceptibility, x-ray diffraction, Mössbauer spectroscopy, and nuclear magnetic resonance measurements we have been able to demonstrate that the transition temperature can be reduced in a monotonic fashion by varying the annealing or quenching temperature from 400ˆ to 850ˆC with the low-temperature state remaining antiferromagnetic for transition temperatures larger than 100 K and becoming collapsed tetragonal, nonmagnetic for transition temperatures below 90 K. This suppression of the orthorhombic-antiferromagnetic phase transition and its ultimate replacement with the collapsed tetragonal, nonmagnetic phase is similar to what has been observed for CaFe2As2 under hydrostatic pressure. Transmission electron microscopy studies indicate that there is a temperature-dependent width of formation of CaFe2As2 with a decreasing amount of excess Fe and As being soluble in the single crystal at lower annealing temperatures. For samples quenched from 960ˆC there is a fine (of order 10 nm) semiuniform distribution of precipitate that can be associated with an average strain field, whereas for samples annealed at 400ˆC the excess Fe and As form mesoscopic grains that induce little strain throughout the CaFe2As2 lattice.</p>
dc.description.comments <p>This article is published as Ran, S., S. L. Bud’Ko, D. K. Pratt, A. Kreyssig, M. G. Kim, M. J. Kramer, D. H. Ryan, W. N. Rowan-Weetaluktuk, Y. Furukawa, B. Roy, A. I. Goldman, and P. C. Canfield. "Stabilization of an ambient-pressure collapsed tetragonal phase in CaFe 2 As 2 and tuning of the orthorhombic-antiferromagnetic transition temperature by over 70 K via control of nanoscale precipitates." <em>Physical Review B</em> 83, no. 14 (2011): 144517. DOI: <a href="https://doi.org/10.1103/PhysRevB.83.144517" target="_blank">10.1103/PhysRevB.83.144517</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/physastro_pubs/686/
dc.identifier.articleid 1691
dc.identifier.contextkey 17444153
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath physastro_pubs/686
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/57483
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/physastro_pubs/686/2011_CanfieldPaul_StabilizationAmbient.pdf|||Sat Jan 15 01:29:39 UTC 2022
dc.source.uri 10.1103/PhysRevB.83.144517
dc.subject.disciplines Condensed Matter Physics
dc.subject.disciplines Materials Science and Engineering
dc.title Stabilization of an ambient-pressure collapsed tetragonal phase in CaFe2As2 and tuning of the orthorhombic-antiferromagnetic transition temperature by over 70 K via control of nanoscale precipitates
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication c5a8128b-7d98-4b8f-92d7-b1385e345713
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
File
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
2011_CanfieldPaul_StabilizationAmbient.pdf
Size:
1.11 MB
Format:
Adobe Portable Document Format
Description:
Collections