Anomalous positive magnetoresistance at low temperatures in nanocrystalline Ni<SUB>3</SUB>Al
- Abhyankar, A. C.
- Kaul, S. N.
DOIAbstract
Reducing the crystallite size to ≅ 45 nm drives the weak itinerant-electron ferromagnet Ni3Al to magnetic instability, where long-range ferromagnetic order collapses. Non-Fermi-liquid behavior of resistivity, ρ(T), at temperatures 4 K<=T<=22 K, an abrupt drop in ρ(T), and a sudden increase in positive magnetoresistance at T≲4 K (presumably due to antiferromagnetic-spin fluctuation-mediated superconductivity) in nanocrystalline Ni3Al indicates that the crossover region near the magnetic quantum critical point extends to temperatures as high as 4 K
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