Pressure-induced magnetic transition exceeding 30 K in the Yb-based heavy fermion superconductor $\beta$-YbAlB${}_4$

Abstract

Measurements of the electric resistivity $\rho (T)$ under pressure up to 8 GPa were performed on high-quality single-crystals of the Yb-based heavy fermion system $\beta$-YbAlB${}_4$ in the temperature range $2<T<$ 300 K. In the resistivity data, we observed pressure-induced magnetic ordering above the critical pressure $P_{\mathrm{c}}\sim$ 2 GPa. Clear difference in the phase diagram under pressure using two types of pressure mediums indicates that the transition temperature may be further enhanced under application of uniaxial pressure. With pressure, this phase transition temperature $T_{\mathrm{M}}$ is enhanced reaching 32 K at 8 GPa, which is the highest transition temperature so far recorded for the Yb-based heavy fermion compounds. The power-law exponent $\alpha$ in $\rho ={\rho }_0+A{T}^{\alpha }$ below $T_{\mathrm{M}}$ gradually changes from 3/2 to 5/2 with increasing pressure from 2 to 8 GPa. In contrast, the resistivity exhibits a $T$-linear behavior in the temperature range 2 $\le T\le$ 20 K and is insensitive to pressure below $P_{\mathrm{c}}$. In this pressure regime, the magnetization is also nearly independent of pressure and shows no anomaly above 2 K. Our results indicate that a quantum critical point for $\beta$-YbAlB${}_4$ is also located near $P_{\mathrm{c}}$ in addition to the strange metal region near the ambient pressure.

arXiv comment7 pages, 5 figures. To be published in Phys. Rev. B

References in corpus (12)

• Magnetic-Field Induced Quantum Critical Point in YbRh${}_2$Si${}_2$
• Field-Induced Quantum Critical Point in CeCoIn5
• Signatures of valence fluctuations in CeCu2Si2 under high pressure
• Quantum Criticality without Tuning in the Mixed Valence Compound beta-YbAlB4
• Strong valence fluctuation in the quantum critical heavy fermion superconductor beta-YbAlB4: A hard x-ray photoemission study
• Emergence of superconductivity in the canonical heavy-electron metal YbRh2Si2
• Strange metal without magnetic criticality
• Anisotropic heavy Fermi-liquid formation in the valence fluctuating $\alpha$-YbAlB${}_4$
• Pressure-Induced Valence Crossover and Novel Metamagnetic Behavior near the Antiferromagnetic Quantum Phase Transition of YbNi${}_3$Ga${}_9$
• Role of two-dimensional electronic state in superconductivity in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Ferromagnetism in YbCu2Si2 at high pressure
• Magnetic order induced by Fe substitution of Al site in the heavy fermion systems alpha-YbAlB4 and beta-YbAlB4

Cited by in corpus (3)

• Frustration and quantum criticality
• High temperature antiferromagnetism in Yb based heavy fermion systems proximate to a Kondo insulator
• Dualism of the 4f electrons and high-temperature antiferromagnetism of the heavy-fermion compound YbCoC${}_2$