Nuclear and magnetic diffraction study of monoclinic TbTaO4
TbTaO4 is a member of the family of rare-earth tantalates which have recently been investigated for their dielectric, luminescent and ion-conducting properties. Furthermore, they have an unusual 'stretched diamond' lattice of rare-earth ions, which is expected to display magnetic frustration as in LiYbO2 and NaCeO2 with the same rare-earth lattice. Our initial study of eight monoclinic LnTaO4 compounds (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er) reveals Curie-Weiss behaviour with no magnetic ordering above 1.8 K except in the case of TbTaO4, which has an antiferromagnetic transition in the specific heat (Cmag/T) at 2.25 K. We propose a nuclear and magnetic neutron diffraction study at variable temperatures from 1.5 to 300 K in order to confirm the crystal structure and determine the magnetic structure of TbTaO4.
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Nicola D. Kelly; Claire V. Colin; S E Dutton; NASSIF Vivian; PUENTE ORENCH Ines and SUARD Emmanuelle. (2021). Nuclear and magnetic diffraction study of monoclinic TbTaO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2854
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