Pressure-Induced Valence Crossover and Novel Metamagnetic Behavior near the Antiferromagnetic Quantum Phase Transition of YbNi${}_3$Ga${}_9$

Abstract

We report electrical resistivity, ac magnetic susceptibility and X-ray absorption spectroscopy measurements of intermediate valence YbNi${}_3$Ga${}_9$ under pressure and magnetic field. We have revealed a characteristic pressure-induced Yb valence crossover within the temperature-pressure phase diagram, and a first-order metamagnetic transition is found below $P_{\mathrm{c}}$ $\sim$ 9 GPa where the system undergoes a pressure-induced antiferromagnetic transition. As a possible origin of the metamagnetic behavior, a critical valence fluctuation emerging near the critical point of the first-order valence transition is discussed on the basis of the temperature-field-pressure phase diagram.

arXiv comment5 pages, 4 figures, accepted for publication in Phys. Rev. Lett

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• Crossover from a heavy fermion to intermediate valence state in noncentrosymmetric Yb2Ni12(P,As)7
• Anomalous metamagnetism in the low carrier density Kondo lattice YbRh3Si7
• Pressure dependent intermediate valence behavior in YbNiGa${}_4$ and YbNiIn${}_4$
• Pressure-induced magnetic transition exceeding 30 K in the Yb-based heavy fermion superconductor $\beta$-YbAlB${}_4$
• Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu${}_2$
• Contrasting pressure evolutions of $f$ electron hybridized states in CeRhIn${}_5$ and YbNi${}_3$Ga${}_9$: an optical conductivity study
• New Quantum Criticality Revealed under Pressure
• Conical Magnetic Structure and Atomic Displacements in Chiral Helimagnet Yb(Ni,Cu)${}_3$Al${}_9$ in Magnetic Fields along the Helical $c$ Axis
• Quantum Valence Criticality in Heavy Fermions on Periodic and Aperiodic Crystals
• Anomalous pressure dependence of the bulk modulus and Yb valence in cubic YbPd