Ultrasound Investigations of Orbital Quadrupolar Ordering in UPd_3

Details Ultrasound Investigations of Orbital Quadrupolar Ordering in UPd_3 Ultrasound Investigations of Orbital Quadrupolar Ordering in UPd_3

1999-08-19

arxiv.org/abs/cond-mat/9908271v1

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages (RevTex), 3 eps-figures, accepted by PRB

Scientific paper

10.1103/PhysRevB.60.R8430

For a high-quality single crystal of UPd_3 we present the relevant elastic constants and ultrasonic attenuation data. In addition to the magnetic phase transition at T_2=4.4 +/- 0.1K and the quadrupolar transition at T_1~6.8K, we find orbital ordering at T_0=7.6 +/- 0.1K concomitant with a symmetry change from hexagonal to orthorhombic. A striking feature is the splitting of the phase transition at T_1 into a second-order transition at T_{+1}=6.9 +/- 0.05K and a first-order transition at T_{-1}=6.7 +/- 0.05K. For the four phase transitions, the quadrupolar order parameters and the respective symmetry changes are specified.

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