Low-Temperature Resistivity Minima and Negative Magnetoresistivities in some Dilute Superconducting Ti Alloys

摘要: Electrical resistivities in the range 1.1 to 35\ifmmode^\circ\else\textdegree\fi{}K and magneto-resistivities 4.2\ifmmode^\circ\else\textdegree\fi{}K have been measured a number of dilute, superconducting hcp Ti alloys. Resistivity minima occurring between 14 18\ifmmode^\circ\else\textdegree\fi{}K are observed \ensuremath{\approx}99.92% pure Ti, Ti-Mn alloys with Mn concentrations 0.02 2.0 at.% (nominal atomic percent). Negative 2.6 7.2% at 30 kG 0.1 at.%. The absolute magnitude negative magnetoresistance increases as temperature decreases for ${T}_{s}lTl4.2\ifmmode^\circ\else\textdegree\fi{}$K, where ${T}_{s}$ is which zero-field resistivity begins decrease due onset supercouductivity. Field- temperature-dependent Hall coefficients liquid helium temperatures containing 1.0 1.2 Cr 0.96 Fe display about 17\ifmmode^\circ\else\textdegree\fi{}K, but, unlike alloys, they small positive magnetoresistivities do not exhibit field-dependent 4.2\ifmmode^\circ\else\textdegree\fi{}K. Neither nor significant 1.3 Co, Ni, Al, or Nb. Considered light recent ideas regarding origin low-temperature resistive anomalies, data suggest that localized magnetic moments exist dilute Cr, Mn, Fe, conduction electrons interact these moments.