Hydrogen-Induced Glasslike Specific-Heat Anomaly in Superconducting Crystalline NbTi0.05

Abstract
Low-temperature specific-heat measurements (0.06-2 K) on a superconducting polycrystalline NbTi0.05 alloy show an anomaly in the presence of interstitial H and D (up to 3 at.%). The excess specific heat is roughly linear in temperature, indicating the existence of a glasslike low-energy excitation spectrum. The results raise the question as to what extent previously observed low-temperature anomalies in metallic glasses may be due to H contamination.