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Author Correa, V.F.; Betancourth, D.; Sereni, J.G.; Caroca-Canales, N.; Geibel, C.
Title Remarkable magnetostructural coupling around the magnetic transition in CeCo0.85Fe0.15Si Type Journal Article
Year 2016 Publication Journal of Physics: Condensed Matter Abbreviated Journal J. Phys.: Condens. Matter
Volume 28 Issue 34 Pages 346003
Keywords magnetostriction, cerium compounds, magnetism
Abstract We report a detailed study of the magnetic properties of CeCo0.85Fe0.15Si under high magnetic

fields (up to 16 Tesla) measuring different physical properties such as specific heat, magnetization,

electrical resistivity, thermal expansion and magnetostriction. CeCo0.85Fe0.15Si becomes

antiferromagnetic at TN 6.7 K. However, a broad tail (onset at TX 13 K) in the specific heat

precedes that second order transition. This tail is also observed in the temperature derivative of

the resistivity. However, it is particularly noticeable in the thermal expansion coefficient where it

takes the form of a large bump centered at TX. A high magnetic field practically washes out that tail

in the resistivity. But surprisingly, the bump in the thermal expansion coefficient becomes a well

pronounced peak fully split from the magnetic transition at TN. Concurrently, the magnetoresistance

also switches from negative to positive above TN. The magnetostriction is considerable and

irreversible at low temperature ( (16T)4×10− L

L

4 at 2 K) when the magnetic interactions

dominate. A broad jump in the field dependence of the magnetostriction observed at low T may be

the signature of a weak ongoing metamagnetic transition. Taking altogether the results indicate the

importance of the lattice effects on the development of the magnetic order in these alloys.
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Notes Approved no
Call Number BT @ victor.correa @ Serial 732
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Author Zapf, V.S.; Correa, V.F.; Sengupta, P.; Batista, C.D.; Tsukamoto, M.; Kawashima, N.; Egan, P.; Pantea, C.; Migliori, A.; Betts, J.B.; Jaime, M.; Paduan-Filho, A.
Title Direct measurement of spin correlations using magnetostriction Type Journal Article
Year 2008 Publication Physical Review B (Condensed Matter and Materials Physics) Abbreviated Journal Phys. Rev. B
Volume 77 Issue 2 Pages 020404-4
Keywords magnetostriction; organic compounds; superexchange interactions
Abstract
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Corporate Author Thesis
Publisher APS Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ hernan @ Serial 305
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