Low-temperature crystal structure and magnetic properties of Gd5Ge3

TitleLow-temperature crystal structure and magnetic properties of Gd5Ge3
Publication TypeJournal Article
Year of Publication2012
AuthorsMudryk Y, Paudyal D, Pecharsky VK, Gschneidner KA
Journal TitlePhysical Review B
Date Published01
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000299867400003
Keywordsalloys, d88 structure, gd-5(si1.8ge2.2), gd-5(sixge1-x)(4), giant magnetoresistance, intermetallic compounds, interstitial compounds, MAGNETOCALORIC COMPOUND, rare-earth germanides, system

The Gd5Ge3 compound prepared using high-purity gadolinium undergoes a structural deformation from hexagonal Mn5Si3-type structure into a new orthorhombic crystal structure. The temperature of the structural transition coincides with the Neel temperature (T-N), confirming the coupling between magnetism and crystal structure. The same intermetallic compound prepared using a commercial grade of gadolinium shows only a minor orthorhombic structural deformation at T-N, which is 19 K lower than that of a Gd5Ge3 sample prepared from the high-purity Gd. The first-principles electronic structure calculations confirm the antiferromagnetic orthorhombic structure as the ground state of Gd5Ge3 and show that interstitial impurities affect the strength of the antiferromagnetic interactions.

URL<Go to ISI>://WOS:000299867400003
Alternate JournalPhys. Rev. B