Magnetic-Field Control of Quantum Critical Points of Valence Transition

Abstract

We study the mechanism how critical end points of first-order valence transitions are controlled by a magnetic field. We show that the critical temperature is suppressed to be a quantum critical point (QCP) by a magnetic field and unexpectedly the QCP exhibits nonmonotonic field dependence in the ground-state phase diagram, giving rise to emergence of metamagnetism even in the intermediate valence-crossover regime. The driving force of the field-induced QCP is clarified to be cooperative phenomena of Zeeman effect and Kondo effect, which create a distinct energy scale from the Kondo temperature. This mechanism explains peculiar magnetic response in CeIrIn5 and metamagnetic transition in YbXCu4 for X=In as well as sharp contrast between X=Ag and Cd.

4 pages, 4 figures

References in corpus (2)

• Signatures of valence fluctuations in CeCu2Si2 under high pressure
• Superconductivity emerging near quantum critical point of valence transition

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• T/B Scaling in beta-YbAlB4
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• Different metamagnetism between paramagnetic Ce and Yb isomorphs
• Wide Quantum Critical Region of Valence Fluctuations: Origin of Robust Quantum Criticality in Quasicrystal Yb15Al34Au51 under Pressure
• New Quantum Criticality Revealed under Pressure
• Theory for Non-Fermi Liquid Temperature Dependence in Resistivity of Ce_xLa_{1-x} Cu_{5.62} Au_{0.38} (x=0.02-0.10) on the Local Quantum Valence Criticality of Ce Impurities