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Title: Complex magnetism and strong electronic correlations in Ce 2 PdGe 3

Abstract

Single-crystal x-ray diffraction, magnetic susceptibility, magnetization, heat capacity, and electrical resistivity measurements are reported for the new tetragonal compound Ce 2PdGe 3, which forms in the space group P4 2/mmc (No. 131)—a relative of the α₋ThSi 2-type structure. Measurements reveal a two-part antiferromagnetic phase transition at T N,1=10.7 K and T N,2=9.6 K and subsequent ferromagnetlike ordering near TC≈2.25 K. The ordered ground state emerges from a lattice of Ce ions that are hybridized with the conduction electrons, as revealed by the enhanced electronic coefficient of the specific heat γ≈50 mJ/mol-Ce-K 2 (extrapolated to T=0 for T < T C). Lastly, electronic structure calculations reveal a Fermi surface that includes sheets with distinct nesting vectors. We find chemical/structural disorder also plays an important role, as evidenced by results from single-crystal x-ray diffraction, the width of the peaks in the heat capacity at T N and T C, and the small residual resistivity ratio RRR=ρ300K/ρ0=1.8.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [6];  [6]
  1. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  3. Florida A&M Univ. and Florida State Univ. College of Engineering, Tallahassee, FL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Florida A&M Univ. and Florida State Univ. College of Engineering, Tallahassee, FL (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1185651
Alternate Identifier(s):
OSTI ID: 1181350
Grant/Contract Number:
AC05-00OR22725; DMR-1157490; SC0008832
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 3; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Baumbach, R. E., Gallagher, A., Besara, T., Sun, J., Siegrist, T., Singh, D. J., Thompson, J. D., Ronning, F., and Bauer, E. D. Complex magnetism and strong electronic correlations in Ce2PdGe3. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.91.035102.
Baumbach, R. E., Gallagher, A., Besara, T., Sun, J., Siegrist, T., Singh, D. J., Thompson, J. D., Ronning, F., & Bauer, E. D. Complex magnetism and strong electronic correlations in Ce2PdGe3. United States. doi:10.1103/PhysRevB.91.035102.
Baumbach, R. E., Gallagher, A., Besara, T., Sun, J., Siegrist, T., Singh, D. J., Thompson, J. D., Ronning, F., and Bauer, E. D. Mon . "Complex magnetism and strong electronic correlations in Ce2PdGe3". United States. doi:10.1103/PhysRevB.91.035102. https://www.osti.gov/servlets/purl/1185651.
@article{osti_1185651,
title = {Complex magnetism and strong electronic correlations in Ce2PdGe3},
author = {Baumbach, R. E. and Gallagher, A. and Besara, T. and Sun, J. and Siegrist, T. and Singh, D. J. and Thompson, J. D. and Ronning, F. and Bauer, E. D.},
abstractNote = {Single-crystal x-ray diffraction, magnetic susceptibility, magnetization, heat capacity, and electrical resistivity measurements are reported for the new tetragonal compound Ce2PdGe3, which forms in the space group P42/mmc (No. 131)—a relative of the α₋ThSi2-type structure. Measurements reveal a two-part antiferromagnetic phase transition at TN,1=10.7 K and TN,2=9.6 K and subsequent ferromagnetlike ordering near TC≈2.25 K. The ordered ground state emerges from a lattice of Ce ions that are hybridized with the conduction electrons, as revealed by the enhanced electronic coefficient of the specific heat γ≈50 mJ/mol-Ce-K2 (extrapolated to T=0 for T < TC). Lastly, electronic structure calculations reveal a Fermi surface that includes sheets with distinct nesting vectors. We find chemical/structural disorder also plays an important role, as evidenced by results from single-crystal x-ray diffraction, the width of the peaks in the heat capacity at TN and TC, and the small residual resistivity ratio RRR=ρ300K/ρ0=1.8.},
doi = {10.1103/PhysRevB.91.035102},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 3,
volume = 91,
place = {United States},
year = {Mon Jan 05 00:00:00 EST 2015},
month = {Mon Jan 05 00:00:00 EST 2015}
}

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