Superconductivity of Titanium

Critical magnetic fields of two specimens of titanium have been measured down to 0.23^∘{}K. The first specimen was a cold worked Ti wire having a purity of 99.98 percent. It was found to be superconducting at 0.37^∘{}K in zero magnetic field and the initial slope of the critical field curve was 465 gauss per degree. The second specimen was a Ti crystal bar with a purity greater than 99.99 percent. Its transition temperature was 0.49^∘{}K, and the initial slope of the critical field curve was 400 gauss per degree.