Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-10-25
Journal of Physics: Condensed Matter 18 (2006) 5147
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages. 1 table, 5 figures. Accepted for publication in Journal of Physics : Condensed Matter. 2006
Scientific paper
10.1088/0953-8984/18/22/014
In the R$\_{3}$Ga$\_{5}$SiO$\_{14}$ compounds, the network R of rare earth cations form well separated planes of corner sharing triangles topologically equivalent to a kagom\'e lattice. Powder samples and single crystals with R = Nd and Pr were prepared and magnetostatic measurements were performed under magnetic field up to 10 T in the temperature range from 1.6 K to 400 K. Analysis of the magnetic susceptibility at the high temperatures where only the quadrupolar term of the crystal electric field prevails, suggests that the Nd and Pr magnetic moments can be modeled as coplanar elliptic rotators perpendicular to the three fold axis of the crystal structure that interact antiferromagnetically. Nonetheless, a disordered phase that can be ascribed to geometric frustration persists down to the lowest temperature which is about 25 times smaller than the energy scale for the exchange interactions.
Ballou Rafik
Bordet Pierre
Canals Benjamin
Gelard Isabelle
Ibanez Alain
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