Magnetization Process and the Associated Lattice Deformations in an Intermetallic Compound Gd_5Ge_3(Condensed matter : electronics structure and electrical, magnetic, and optical properties)

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The results of magnetization and synchrotron X-ray diffraction measurements on Gd_5Ge_3 subject to a pulsed high magnetic field are reported. When the magnetic field, H, is applied parallel to the a-axis, a sudden increase in magnetization, M, has been observed at 〜3.8 T. For H ‖ c, M increases monotonically with H. The magnetization becomes saturated above about 30T for the two orientations. The lattice constant, a elongates, while c shrinks with increasing H. We calculate the exchange energy under applied magnetic fields based on the proposed magnetic structure assuming an antiferromagnetic exchange interaction in the a-a plane and a ferromagnetic one along the c-axis. We are successful in explaining the opposing behavior of the lattice deformations. Our calculation shows that the change in the lattice constants is proportional to M^2, in agreement with the observation.
社団法人日本物理学会の論文
2008-05-15