Oscillations and quantization of resistance at the temperature critical points of PbS-PbTe-PbS three-layer films on (001) KCl

Oscillations and a set of inflection points have been discovered in the temperature dependences of the resistance of single-crystal PbS-PbTe-PbS three-layer films on (001) KCl. Extrema and inflection points are observed at the temperatures (m/n)T ₀ (T ₀=5.238 K), and at these temperature critical points the resistance of the samples takes one of the values (p/q)R _Q , where R _Q =25812.8 Ω is the resistance quantum; and m, n, p, and q are integers. Fiz. Tverd. Tela (St. Petersburg) 41, 1693–1697 (September 1999)