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Physical properties of the Ce2MAl7Ge4 heavy-fermion compounds (M = Co, Ir, Ni, Pd)

Title: Physical properties of the Ce2MAl7Ge4 heavy-fermion compounds (M = Co, Ir, Ni, Pd).
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Name(s): Ghimire, N. J., author
Cary, S. K., author
Eley, S., author
Wakeham, N. A., author
Rosa, P. F. S., author
Albrecht-Schmitt, T., author
Lee, Y., author
Janoschek, M., author
Brown, C. M., author
Civale, L., author
Thompson, J. D., author
Ronning, F., author
Bauer, E. D., author
Type of Resource: text
Genre: Text
Date Issued: 2016-05-23
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We report the synthesis, crystal structure, and characterization by means of single-crystal x-ray diffraction, neutron powder diffraction, and magnetic, thermal, and transport measurements of the new heavy-fermion compounds Ce2MAl7Ge4 (M = Co, Ir, Ni, Pd). These compounds crystallize in a noncentrosymmetric tetragonal space group P (4) over bar2(1)m, consisting of layers of square nets of Ce atoms separated by Ge-Al and M-Al-Ge blocks. Ce2CoAl7Ge4, Ce2IrAl7Ge4, and Ce2NiAl7Ge4 order magnetically below T-M = 1.8, 1.6, and 0.8 K, respectively. There is no evidence of magnetic ordering in Ce2PdAl7Ge4 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 TM suggest a strong Kondo interaction in these materials. Ce2PdAl7Ge4 shows non-Fermi liquid behavior, possibly due to the presence of a nearby quantum critical point.
Identifier: FSU_libsubv1_wos_000376638200005 (IID), 10.1103/PhysRevB.93.205141 (DOI)
Keywords: magnetism, metals, quantum phase-transitions, Superconductivity
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1103/PhysRevB.93.205141
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000376638200005
Owner Institution: FSU
Is Part Of: Physical Review B.
2469-9950
Issue: iss. 20, vol. 93

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Ghimire, N. J., Cary, S. K., Eley, S., Wakeham, N. A., Rosa, P. F. S., Albrecht-Schmitt, T., … Bauer, E. D. (2016). Physical properties of the Ce2MAl7Ge4 heavy-fermion compounds (M = Co, Ir, Ni, Pd). Physical Review B. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000376638200005