Evolution of magnetism in Yb(Rh1−xCox)2Si2

2011/04/06 by Christoph Klingner, C. Klingner, C. Krellner +14 · 3 citations
Materials Science · Physics and Astronomy · #Algorithm #Artificial intelligence #Computer science #Iron-based superconductors research #Magnetic Properties of Alloys #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.83.144405

published as Phys. Rev. B 83, 144405 (2011) · 11 pages, 9 figures

openalex publication_date 2011/04/06 · arxiv created 2011/04/07 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present a study of the evolution of magnetism from the quantum critical system YbRh₂Si₂ to the stable trivalent Yb system YbCo₂Si₂. Single crystals of Yb(Rh_1\ensuremath-xCo_x)₂Si₂ were grown for 0\ensuremath\leqslantx\ensuremath\leqslant1 and studied by means of magnetic susceptibility, electrical resistivity, and specific heat measurements, as well as photoemission spectroscopy. The results evidence a complex magnetic phase diagram, with a nonmonotonic evolution of T_N and two successive transitions for some compositions resulting in two tricritical points. The strong similarity with the phase diagram of YbRh₂Si₂ under pressure indicates that Co substitution basically corresponds to the application of positive chemical pressure. Analysis of the data proves a strong reduction of the Kondo temperature T_K with increasing Co content, T_K becoming smaller than T_N for x\ensuremath≈0.5, implying a strong localization of the 4f electrons. Furthermore, low-temperature susceptibility data confirm a competition between ferromagnetic and antiferromagnetic exchange. The series Yb(Rh_1\ensuremath-xCo_x)₂Si₂ provides an excellent experimental opportunity to gain a deeper understanding of the magnetism at the quantum critical point in the vicinity of YbRh₂Si₂ where the antiferromagnetic phase disappears (T_N\ensuremath→0).

Citations

• Electrical resistivity ofYb(Rh1-xCox)2Si2single crystals at low temperatures
• The break-up of heavy electrons at a quantum critical point
• Violation of Critical Universality at the Antiferromagnetic Phase Transition ofYbRh2Si2
• Divergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point inYbRh2Si2
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
• Ferromagnetic Quantum Critical Fluctuations inYbRh2(Si0.95Ge0.05)2

Cited by

• Competing orders, competing anisotropies, and multicriticality: The case of Co-dopedYbRh2Si2
• Ferromagnetic quantum criticality in the quasi-one-dimensional heavy fermion metal YbNi4P2
• Insight into the temperature dependent properties of the ferromagnetic Kondo lattice YbNiSn