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Title: Physical properties of the Ce 2 M Al 7 Ge 4 heavy-fermion compounds ( M = Co , Ir , Ni , Pd )

Here, 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 Ce 2MAl 7Ge 4 (M=Co,Ir,Ni,Pd). These compounds crystallize in a noncentrosymmetric tetragonal space group P$$\bar{4}$$2 1m, consisting of layers of square nets of Ce atoms separated by Ge-Al and M-Al-Ge blocks. Ce 2CoAl 7Ge 4,Ce 2IrAl 7Ge 4, and Ce 2NiAl 7Ge 4 order magnetically below TM=1.8, 1.6, and 0.8 K, respectively. There is no evidence of magnetic ordering in Ce 2PdAl 7Ge 4 down to 0.4 K. Furthermore, the small amount of entropy released in the magnetic state of Ce 2MAl 7Ge 4 (M = Co, Ir, Ni) and the reduced specific heat jump at T M suggest a strong Kondo interaction in these materials. Ce 2PdAl 7Ge 4 shows non-Fermi liquid behavior, possibly due to the presence of a nearby quantum critical point.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Florida State Univ., Tallahassee, FL (United States). Dept. of Chemistry and Biochemistry
  3. Center for Artificial Low Dimensional Electronic Systems, Pohang (Korea). Inst. for Basic Science
  4. Center for Neutron Research, Gaithersburg, MD (United States). National Inst. of Standards and Technology
Publication Date:
Report Number(s):
LA-UR-15-27485
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC52-06NA25396; FG02-13ER16414
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science
OSTI Identifier:
1334137
Alternate Identifier(s):
OSTI ID: 1254216

Ghimire, N. J., Cary, S. K., Eley, S., Wakeham, N. A., Rosa, P. F. S., Albrecht-Schmitt, T., Lee, Y., Janoschek, M., Brown, C. M., Civale, L., Thompson, J. D., Ronning, F., and Bauer, E. D.. Physical properties of the Ce2MAl7Ge4 heavy-fermion compounds (M=Co,Ir,Ni,Pd). United States: N. p., Web. doi:10.1103/PhysRevB.93.205141.
Ghimire, N. J., Cary, S. K., Eley, S., Wakeham, N. A., Rosa, P. F. S., Albrecht-Schmitt, T., Lee, Y., Janoschek, M., Brown, C. M., Civale, L., Thompson, J. D., Ronning, F., & Bauer, E. D.. Physical properties of the Ce2MAl7Ge4 heavy-fermion compounds (M=Co,Ir,Ni,Pd). United States. doi:10.1103/PhysRevB.93.205141.
Ghimire, N. J., Cary, S. K., Eley, S., Wakeham, N. A., Rosa, P. F. S., Albrecht-Schmitt, T., Lee, Y., Janoschek, M., Brown, C. M., Civale, L., Thompson, J. D., Ronning, F., and Bauer, E. D.. 2016. "Physical properties of the Ce2MAl7Ge4 heavy-fermion compounds (M=Co,Ir,Ni,Pd)". United States. doi:10.1103/PhysRevB.93.205141. https://www.osti.gov/servlets/purl/1334137.
@article{osti_1334137,
title = {Physical properties of the Ce2MAl7Ge4 heavy-fermion compounds (M=Co,Ir,Ni,Pd)},
author = {Ghimire, N. J. and Cary, S. K. and Eley, S. and Wakeham, N. A. and Rosa, P. F. S. and Albrecht-Schmitt, T. and Lee, Y. and Janoschek, M. and Brown, C. M. and Civale, L. and Thompson, J. D. and Ronning, F. and Bauer, E. D.},
abstractNote = {Here, 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$\bar{4}$21m, 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 TM=1.8, 1.6, and 0.8 K, respectively. There is no evidence of magnetic ordering in Ce2PdAl7Ge4 down to 0.4 K. Furthermore, 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.},
doi = {10.1103/PhysRevB.93.205141},
journal = {Physical Review B},
number = 20,
volume = 93,
place = {United States},
year = {2016},
month = {5}
}