Figure 1

(a) Zero-field in-plane resistivity ${\rho }_{ab}$ vs $T^{1.5}$ for various single crystals with different qualities. Inset: Temperature dependence of ${\rho }_{ab}$ for $T\le 100\mathrm{mK}$. (b) Inverse dc susceptibility $H/M$ (left axis) and the inverse of the real part of the ac susceptibility ${\chi }^{\prime -1}$ (right axis) measured under a dc field of 12 mT along the $c$ axis are plotted vs $T^{-1/3}$. For the ac-susceptibility measurement, an ac field of $0.1\mu \mathrm{T}$ and the frequency $f=32\mathrm{Hz}$ is applied along the $c$ axis. The linear fits indicate a $T^{-1/3}$ dependence for the susceptibility. (c) Low temperature magnetic susceptibility measured under a field of 0.1 T along the $c$ axis for three sets of single crystals with different average $\mathrm{RRR}$.Reuse & Permissions

Figure 2

Temperature dependence of the field-cooled (FC) and zero-field-cooled data (ZFC) of the dc susceptibility $M/H$, (a) under a field $H=60\mu \mathrm{T}$ along the $ab$ plane, and (b) under $H=3\mu \mathrm{T}$ along the $c$ axis.Reuse & Permissions

Figure 3

$M$ vs $B$ in the superconducting state of $\beta \mathrm{\text{−}}{\mathrm{YbAlB}}_4$ under the field (a) along the $ab$ plane at 25 mK, and (b) along the $c$ axis at 30 mK. Inset: (a) Low field part of the magnetization curve in the main panel.Reuse & Permissions

Figure 4

Temperature dependence of the upper critical field $B_{c2}$ along the $ab$ plane (square, blue) and the $c$ axis (circle, red). Different single crystals with similar $T_c$ were used for each field direction measurement. Broken lines represent the curves obtained by fitting to the experimental results near $T_c$ using the WHH model. Inset: In-plane resistivity ${\rho }_{ab}$ vs $B$. $B_{c2}$ is defined as the crossing point of the linear extrapolation lines of the resistivity in the normal state and the resistivity change in the transition.Reuse & Permissions