The influence of magnetic sublattice dilution on magnetic order in CeNiGe3 and UNiSi2

Abstract

Polycrystalline samples of the Y-diluted antiferromagnet CeNiGe3 (T_N = 5.5 K) and Th-diluted ferromagnet UNiSi2 (T_C = 95 K) were studied by means of x-ray powder diffraction, magnetization and specific heat measurements performed in a wide temperature range. The lattice parameters of the Ce1-xYxNiGe3 alloys decrease linearly with increasing the Y content, while the unit cell volume of U1-xThxNiSi2 increases linearly with rising the Th content. The ordering temperatures of the systems decrease monotonically with increasing x down to about 1.2 K in Ce0.4Y0.6NiGe3 and 26 K in U0.3Th0.7NiSi2, forming a dome of a long-range magnetic order on their magnetic phase diagrams. The suppression of the magnetic order is associated with distinct broadening of the anomalies at T_N,C due to crystallographic disorder being a consequence of the alloying. Below the magnetic percolation threshold xc of about 0.68 and 0.75 in the Ce- and U-based alloys, respectively, the long-range magnetic order smoothly evolves into a short-range one, forming a tail on the magnetic phase diagrams. The observed behaviour Ce1-xYxNiGe3 and U1-xThxNiSi2 is characteristic of diluted magnetic alloys. (c) 2012 IOP Publishing Ltd.

arXiv commentThis is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher-authenticated version is available online at doi:10.1088/0953-8984/24/27/276003

References in corpus (9)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Disorder-Driven Non-Fermi Liquid Behavior of Correlated Electrons
• Kondo-Cluster-Glass State near a Ferromagnetic Quantum Phase Transition
• Single-ion Kondo Scaling of the Coherent Fermi Liquid Regime in Ce1-xLaxNi2Ge2
• Magnetic ground state of CeNi${}_{1-x}$Cu${}_x$: A calorimetric investigation
• Evolution of an Unconventional Superconducting State inside the Antiferromagnetic Phase of CeNiGe${}_3$ under Pressure: a ${}^{73}$Ge-Nuclear-Quadrupole-Resonance Study
• Superconducting phase transition in YNiGe3, a non-f-electron reference to the unconventional superconductor CeNiGe3
• Search for quantum criticality in a ferromagnetic system UNi1-xCoxSi2
• Evolution from localized to intermediate valence regime in Ce2Cu2-xNixIn

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• Non-collinear ferromagnetism in the Kondo lattice Ce${}_5$CoGe${}_2$