Magnetic anisotropy and spin-glass behavior in single crystalline U 2PdSi3

D. X. Li, A. Kimura, Y. Haga, S. Nimori, T. Shikama

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We present the magnetic and transport properties of single crystalline U2PdSi3 measured with the magnetic field (H) (or measuring current, I ) applied along two typical crystallographic directions, i.e. H ⊥ c-axis and H ∥ c-axis (or I ⊥ c-axis and I ∥ c-axis). For both directions, a spin-glass state is confirmed to form at low temperature with the same spin freezing temperature Tf (=11.5 K), initial frequency shift δTf (=0.023) and activation energy Ea/k B (=90.15 K) in zero dc field. Strong anisotropy in magnetic and transport behavior is found to be a significant feature of U 2PdSi3. The unusual ferromagnetic-like anomaly in ac susceptibility and dc magnetization curves around Tm = 71 K is observed in the case of H ∥ c-axis but not in the cases of H ⊥ c-axis. The characteristic temperature Tir, below which evident irreversible magnetism originated from random spin freezing can be observed, shows much stronger field dependence for H ⊥ c-axis than for H ∥ c-axis. Moreover, an unusual finding is that the electrical resistivity measurements indicate the formation of magnetic Brillouin-zone boundary gaps and much larger magnetic scattering for I ⊥ c-axis, while the coherent-Kondo-effect-like behavior is obvious for I ∥ c-axis. We also emphasize that no resistivity minimum can be detected down to 2.5 K for either direction. The observed magnetic and transport behaviors are compared with those in polycrystalline U 2PdSi3 and other 2:1:3 intermetallic compounds.

Original languageEnglish
Article number076003
JournalJournal of Physics Condensed Matter
Issue number7
Publication statusPublished - 2011 Feb 23


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