Evolution of magnetism in Yb(Rh_(1-x)Co_x)2Si2

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-x)Co_x)2Si2 were grown for 0 < x < 1 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 non-monotonic 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 ~ 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-x)Co_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=>0).

11 pages, 9 figures

References in corpus (6)

• Quantum Criticality in Heavy Fermion Metals
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
• Multiple energy scales at a quantum critical point
• Fermi-surface collapse and dynamical scaling near a quantum critical point
• Divergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point in YbRh${}_2$Si${}_2$
• Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2

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• Quantum Order-by-Disorder in Strongly Correlated Metals
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• Kondo-lattice ferromagnets and their peculiar order along the magnetically hard axis
• Magnetic hard-axis ordering near ferromagnetic quantum criticality
• Similar temperature scale for valence changes in Kondo lattices with different Kondo temperatures
• Competing orders, competing anisotropies, and multicriticality: The case of Co-doped YbRh2Si2
• Electron Spin Resonance of the Yb 4f moment in Yb(Rh1-xCox)2Si2
• Evolution from Ferromagnetism to Antiferromagnetism in Yb(Rh1-xCox)2Si2
• Magnetization study of the energy scales in YbRh${}_2$Si${}_2$ under chemical pressure
• Non-Fermi-liquid behavior at anti-ferromagnetic quantum critical point in heavy fermion system Ce(Cu${}_{1-x}$Co${}_x$)${}_2$Ge${}_2$
• Why rare-earth ferromagnets are so rare: insights from the p-wave Kondo model
• Ferromagnetic ordering along the hard axis in the Kondo lattice YbIr3Ge7
• Insight into the temperature dependent properties of the ferromagnetic Kondo lattice YbNiSn
• Topological crossovers near a quantum critical point
• Magnetic phase diagram of YbCo2Si2 derived from magnetization measurements
• Tuning low-energy scales in YbRh${}_2$Si${}_2$ by non-isoelectronic substitution and pressure
• Dependence of transport coefficients of Yb(Rh${}_{1-x}$Co${}_x$)${}_2$Si${}_2$ intermetallics on temperature and cobalt concentration
• Unique magnetic structure of YbCo${}_2$Si${}_2$
• Photoemission insights into lanthanide-based crystals
• Fermionic Order by Disorder in a van der Waals Antiferromagnet