854 research outputs found

    Kinetic Evaluation of VX-2 Tumor with PET Using 11C-ACPC

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    Geometrical quadrupolar frustration in DyB4_4

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    Physical properties of DyB4_4 have been studied by magnetization, specific heat, and ultrasonic measurements. The magnetic entropy change and the ultrasonic properties in the intermediate phase II indicate that the degeneracy of internal degrees of freedom is not fully lifted in spite of the formation of magnetic order. The ultrasonic attenuation and the huge softening of C44C_{44} in phase II suggests existence of electric-quadrupolar (orbital) fluctuations of the 4ff-electron. These unusual properties originate from the geometrical quadrupolar frustration.Comment: 4 pages, 4 figures, accepted for publication in Journal of the Physical Society of Japa
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