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We address the origin of the magnetic-field independent -|A| T^{1/2} termobserved in the low-temperature resistivity of several As-based metallicsystems of the PbFCl structure type. For the layered compoundZrAs_{1.58}Se_{0.39}, we show that vacancies in the square nets of As give riseto the low-temperature transport anomaly over a wide temperature regime ofalmost two decades in temperature. This low-temperature behavior is in linewith the non-magnetic version of the two-channel Kondo effect, whose origin weascribe to a dynamic Jahn-Teller effect operating at the vacancy-carrying Aslayer with a C_4 symmetry. The pair-breaking nature of the dynamical defects inthe square nets of As explains the low superconducting transition temperatureT_{\rm{c}}\approx 0.14 K of ZrAs_{1.58}Se_{0.39}, as compared to thefree-of-vacancies homologue ZrP_{1.54}S_{0.46} (T_{\rm{c}}\approx 3.7 K). Ourfindings should be relevant to a wide class of metals with disordered pnictogenlayers.

Two-channel Kondo physics due to As vacancies in the layered compound ZrAs1.58Se0.39