Structural and magnetic transitions in Gd5SixGe4-x (0 <= x <= 0.9) from neutron powder diffraction

TitleStructural and magnetic transitions in Gd5SixGe4-x (0 <= x <= 0.9) from neutron powder diffraction
Publication TypeJournal Article
Year of Publication2010
AuthorsRyan DH, Cadogan JM, Cranswick LMD, Gschneidner KA, Pecharsky VK, Mudryk Y
Journal TitlePhysical Review B
Volume82
Pages224405
Date Published12
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000286756300003
Keywordsalloys, GD5SI4-GD5GE4, PHASE-RELATIONSHIPS, system
Abstract

Gd5SixGe4-x (0 <= x <= 0.9) has been studied using neutron powder diffraction at a wavelength of 2.3724 angstrom. Antiferromagnetic ordering of the full 7 mu(B) Gd moments in the Pnm'a magnetic space group is seen for Gd5Ge4, with the moments predominantly parallel to the c axis, with a significant a-axis component at the Gd 8d(2) site. The remarkably strong (010) antiferromagnetic reflection has been used to map out the structural and magnetic phase diagram for this system and show that the O(II)-> O(I) structural transformation never proceeds to completion in zero field. The absence of scattering that could be attributed to long-range FM order in the O(I) modification suggests that an externally applied field may be needed to stabilize the ferromagnetic state.

URL<Go to ISI>://000286756300003
DOI10.1103/PhysRevB.82.224405
Alternate JournalPhys. Rev. B