LOW-TEMPERATURE RESISTIVITY MINIMA AND NEGATIVE MAGNETORESISTIVITIES IN SOME DILUTE SUPERCONDUCTING Ti ALLOYS
Electrical resistivities at 1.1 to 35 deg K and magnetoresistivitios at 1.1 to 4.2 deg K were measured in dilute, superconducting hcp Ti alloys. Resistivity minima occurring between 14 and 18 deg K are observed in approximately 99.92% pure Ti, and in Ti-Mn alloys with Mn concentrations between 0.02 and 2.0 at.% (nominal atomic percent). Negative magnetoresistivities between 2.6 and 7.2% at 30 kG and 4.2 deg K are observed in TiMn alloys with Mn concentrations between 0.1 and 2.0 at.%. The absolute magnitude of the negative magnetoresistance increases as temperature decreases for T/sub 3/ < T < 4.2 deg K, where T/sub 3/ is the temperature at which the zero-field resistivity begins to decrease due to the onset of superconductivity. Field- and temperature- dependent Hall coefficients are observed at liquid helium temperatures in Ti containing Mn concentrations of 1.0 and 2.0 at.%. Ti alloys containing 1.2 at.% Cr and 0.96 at.% Fe display resistivity minima at about 17 deg K, but, unlike Ti- Mn alloys, they have small positive magnetoresistivities and do not exhibit field- dependent Hall coefficients at 4.2 deg K. Neither negative magnetoresistivitifs nor significant resistivity minima are observed in Ti containing 1.3 at.% Co, 1.0 at.% Ni, 1.1 at.% Al, or 1.0 at.% Nb. Considered in the light of ideas regarding the origin of the low-temperature resistive anomalies, the data suggest that localized magnetic moments exist in dilute superconducting Ti alloys containing Cr, Mn, and Fe, and that the conduction electrons interact with these moments. (auth)
- Research Organization:
- Atomics International, Canoga Park, Calif.
- NSA Number:
- NSA-16-027818
- OSTI ID:
- 4802196
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 127; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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