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

Published

May 23, 2016

Author(s)

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

Abstract

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 T_C = 1.8, 1.6, and 0.8 K, respectively. There is no evidence of magnetic ordering in Ce₂PdAl_7&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 T_C 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.

Citation

Physical Review B

Volume

93

Issue

20

Pub Type

Journals

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Keywords

neutron scattering, diffraction, magnetism

Citation

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 Ce₂MAl₇Ge₄ Heavy-Fermion Compounds (M = C0, Ir,Ni,Pd), Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=919436 (Accessed July 18, 2024)