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Effect of Biaxial Strain on the Phase Transitions of (CadFe(1-x)Co(x))(2)As-2

TitleEffect of Biaxial Strain on the Phase Transitions of (CadFe(1-x)Co(x))(2)As-2
Publication TypeJournal Article
Year of Publication2017
AuthorsBohmer, AE, Sapkota, A, Kreyssig, A, Bud'ko, SL, Drachuck, G, Saunders, SM, Goldman, AI, Canfield, PC
JournalPhysical Review Letters
Date Published03
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000396047700010
Keywordsbafe2as2, chalcogenides, high-temperature superconductivity, iron pnictides, physics, stress

We study the effect of applied strain as a physical control parameter for the phase transitions of Ca(Fe1-xCox)(2)As-2 using resistivity, magnetization, x-ray diffraction, and Fe-57 Mossbauer spectroscopy. Biaxial strain, namely, compression of the basal plane of the tetragonal unit cell, is created through firm bonding of samples to a rigid substrate via differential thermal expansion. This strain is shown to induce a magnetostructural phase transition in originally paramagnetic samples, and superconductivity in previously nonsuperconducting ones. The magnetostructural transition is gradual as a consequence of using strain instead of pressure or stress as a tuning parameter.

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Alternate JournalPhys. Rev. Lett.