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Physical Properties of the Ce2MAl7Ge4 Heavy-Fermion Compounds (M = C0, Ir,Ni,Pd)



N. J. Ghimire, S. K. Cary, S. Eley, N. A. Wakeham, P. F. S. Rosa, T. Albrecht-Schmitt, Y. Lee, M. Janoschek, Craig Brown, L. Civale, J. D. Thompson, F. Ronning, E. D. Bauer


The synthesis, crystal structure and physical properties by means of single crystal x-ray diffraction, neutron powder diffraction, magnetic, thermal and transport measurements of the new heavy fermion compounds Ce2M Al7Ge4(M = Co, Ir, Ni, Pd) are reported. These compounds crystallize in a noncentrosymmetic tetragonal space group P421m, consisting of layers of square nets of Ce atoms separated by Ge-Al and Ge-M-Al blocks. Ce2CoAl7Ge4, Ce2IrAl7Ge4 and Ce2NiAl7Ge4 show complex magnetic behavior below TC = 1.8, 1.6, and 0.8 K, respectively. There is no evidence of magnetic ordering in Ce2PdAl7&Ged4^ down to 0.4 K. The small amount of entropy released in the magnetic state of Ce2MAl7Ge4 (M = Co, Ir, Ni) and the reduced specific heat jump at TC suggests a strong Kondo interaction in these materials. Ce2PdAl7Ge4 shows non-Fermi liquid behavior, possibly due to the presence of a nearby quantum critical point.
Physical Review B


neutron scattering, diffraction, magnetism


Ghimire, N. , Cary, S. , Eley, S. , Wakeham, N. , Rosa, P. , Albrecht-Schmitt, T. , Lee, Y. , Janoschek, M. , Brown, C. , Civale, L. , Thompson, J. , Ronning, F. and Bauer, E. (2016), Physical Properties of the Ce<sub>2</sub>MAl<sub>7</sub>Ge<sub>4</sub> Heavy-Fermion Compounds (M = C0, Ir,Ni,Pd), Physical Review B, [online], (Accessed June 21, 2024)


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Created May 22, 2016, Updated October 12, 2021