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Figure 1.  (a) Crystal structure information of RhP₂. (b) Single crystal XRD data of RhP₂. The inset is an optical picture of typical RhP₂ single crystal used for the x-ray testing.

Figure 2.  The transport data of RhP₂ single crystal: (a) the temperature dependence of the resistivity ρ_xx of RhP₂ single crystal with an applied magnetic field of 9 T and 0 T, (b) fit data using ρ (T) = ρ₀ exp (Δ/k_BT), resulting in Δ = 27.4 meV for 2 K < T < 20 K and Δ = 223.1 meV for 20 K < T < 100 K.

Figure 3.  Hall data, carrier densities, and mobilities of RhP₂. (a) Hall resistivity ρ_xy of RhP₂ single crystal at 2 K, 5 K, 10 K, 5 K, 20 K, 25 K, 50 K, 100 K, 200 K, and 300 K with applying field along [011] direction. (b) The carriers and mobilities results by fitting the Hall data using the single-band model.

Figure 4.  (a) Temperate-dependent specific heat coefficient C_p for RhP₂. (b) Low-temperature specific heat fitting with formula C_p/T = βT²+γ for RhP₂.

Figure 5.  (a) Zero field cooling (ZFC) and field cooling (FC) data of dc magnetic susceptibility measured of RhP₂. (b) The χ(H) data of RhP₂ at temperatures of 2 K and 300 K.