Nanoscratch in highly oriented FeSe_0.5Te_0.5 superconductor

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• 作者：Alcione Roberto Jurelo^a ; ^{arjurelo@uepg.br} ; Francisco Carlos Serbena^a ; Gelson Biscaia de Souza^a ; Carlos Eugê ; nio Foerster^a ; Nilson Biagini Sabino^a ; Simone Aparecida da Silva^a ; Cristiano Santos Lopes^a ; Jorge Luiz Pimentel Jú ; nior^b
• 关键词：FeSe(Te) ; Iron-based superconductor ; Chalcogenide superconductors ; Instrumented indentation ; Nanoscratch
• 刊名：Wear
• 出版年：2013
• 出版时间：15 June, 2013
• 年：2013
• 卷：303
• 期：1-2
• 页码：78-82
• 全文大小：1562 K

文摘

Tribological properties of highly oriented lamellar FeSe_0.5Te_0.5 superconductor samples were investigated. Nanoscratch morphologies and profiles were characterized by instrumented indentation, SEM and AFM. Anisotropies of the scratch morphologies of the ab- and a(b)c-planes were observed. Plowing seems to be the main mechanism of scratch deformation in the ab-plane, with plenty of material pile-up around the scars. Distinctively, microcracking is the dominant deformation process in the a(b)c-plane. Also, the scratch resistance of the a(b)c-plane is higher than the ab-plane, which presented scratch hardness values of 1.5 GPa and 0.6 GPa, respectively. Cracks were observed in the a(b)c-plane parallel to the c-axis. These observations are consistent with the deformation mechanism of cracks running perpendicular to the c-axis in the same a(b)c-plane, produced by indentations.