Magneto-structural order in 'breathing' pyrochlore spinels
The spinel oxide family of materials displays a rich variety of physics, from spin frustration to heavy fermion behavior. In this context, we have recently studied the chromium spinels LiGaCr4O8 and LiInCr4O8, where the A-site is populated by two cations. This substitution causes an alternation in the dimensions of the Cr3+ (S=3/2) tetrahedra on the B-site, and leads to a corresponding alternation in the magnetic exchanges. While previous diffraction measurements have shown a two-step magneto-structural ordering in both compounds, the details of the magnetic and nuclear structures have thus far proven elusive. As a first step towards a deeper understanding of the complex low T behavior of these compounds, we propose a magnetic diffraction experiment on the D20 diffractometer.
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NILSEN Goran; FENNELL Tom; Thomas C. Hansen; KENZELMANN Michel; MUTKA Hannu; OKAMOTO Yoshihiko and WAWRZYNCZAK Rafal. (2015). Magneto-structural order in 'breathing' pyrochlore spinels. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2396
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