Complex magnetism and strong electronic correlations in Ce2 PdGe3
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). Electronic structure calculations reveal a Fermi surface that includes sheets with distinct nesting vectors. 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.
© 2015 American Physical Society
Baumbach, R. E., A. Gallagher, T. Besara, J. Sun, T. Siegrist, D. J. Singh, J. D. Thompson, F. Ronning, and E. D. Bauer. "Complex magnetism and strong electronic correlations in Ce 2 PdGe 3." Physical Review B 91, no. 3 (2015): 035102.
Physical Review B