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Yb2Pt2Pb: Magnetic frustration in the Shastry-Sutherland lattice M. S. Kim,1,2

Summary: Yb2Pt2Pb: Magnetic frustration in the Shastry-Sutherland lattice
M. S. Kim,1,2
M. C. Bennett,2,3
and M. C. Aronson1,2,3
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120, USA
3Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA
Received 16 July 2007; revised manuscript received 21 March 2008; published 23 April 2008
We have synthesized single crystals of Yb2Pt2Pb, which crystallize in the layered U2Pt2Sn-type structure,
where planes of Yb ions lie on a triangular network. Here, we report the results of magnetization, specific heat,
and electrical resistivity experiments. The lattice constants and high temperature magnetic susceptibility indi-
cate that the Yb ions are trivalent, while the Schottky peaks in the specific heat show that the ground state is
a well isolated doublet. A significant magnetic anisotropy is observed, with the ratio of susceptibilities perpen-
dicular and parallel to the magnetic planes differing by as much as a factor of 30 at the lowest temperatures.
Antiferromagnetic order occurs at a Néel temperature TN=2.07 K. Evidence of short range magnetic fluctua-
tions is found in the magnetic susceptibility and electrical resistivity, which have broad peaks above TN, and in
the slow development of the magnetic entropy at TN. Our experiments indicate that Yb2Pt2Pb is a quasi-two-
dimensional and localized moment system, where strong magnetic frustration may arise from the geometry of


Source: Aronson, Meigan - Department of Physics and Astronomy, SUNY at Stony Brook


Collections: Materials Science; Physics