Magnetic phase diagram of Ce2Fe17

TitleMagnetic phase diagram of Ce2Fe17
Publication TypeJournal Article
Year of Publication2007
AuthorsJanssen Y, Chang S, Kreyssig A, Kracher A, Mozharivskyj Y, Misra S, Canfield PC
Journal TitlePhysical Review B
Volume76
Pages054420
Date PublishedAug
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000249155100091
KeywordsGIANT, intermetallic compounds, ITINERANT-ELECTRON-SYSTEMS, magnetoresistance, neutron-diffraction, rare-earth, single-crystals, SOLID-SOLUTIONS, SOLUTION GROWTH, X-RAY DICHROISM, Y-FE COMPOUNDS
Abstract

Rare-earth-based permanent-magnet materials rich in iron have relatively low ferromagnetic ordering temperatures. This is believed to be due to the presence of antiferromagnetic exchange interactions, besides the ferromagnetic interactions responsible for the magnetic order. The magnetic properties of Ce2Fe17 are anomalous. Instead of ferromagnetic, it is antiferromagnetic, and instead of one ordering temperature, it shows two, at the Neel temperature T-N similar to 208 K and at T-t similar to 124 K. Ce2Fe17, doped by 0.5% Ta, also shows two ordering temperatures, one to an antiferromagnetic phase, at T-N similar to 214 K, and one to a ferromagnetic phase, at T-0 similar to 75 K. In order to clarify this behavior, single-crystalline samples were prepared by solution growth and characterized by electron microscopy, single-crystal x-ray diffraction, temperature-dependent specific heat, and magnetic field and temperature-dependent electrical resistivity and magnetization. From these measurements, magnetic H-T phase diagrams were determined for both Ta-doped Ce2Fe17 and undoped Ce2Fe17. These phase diagrams can be very well described in terms of a theory that gives magnetic phase diagrams of systems with competing antiferro- and ferromagnetism.

DOI10.1103/PhysRevE.76.054420
Alternate JournalPhys. Rev. B