Normal State Properties of Exchange-Enhanced Paramagnetic Compound TiCo(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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Exchange-enhanced paramagnetic compound TiCo has recently been found to become superconducting at 35mK. We have measured the electrical resistivity, specific heat, and magnetization in the normal state of a newly prepared polycrystalline TiCo whose superconducting transition temperature is 45mK in comparison with that whose transition temperature is 35mK. The electrical resistivity shows a linear relationship with T^2 at low temperatures and a nearly linear relationship with T at high temperatures. Specific heat is interpreted as the sum of the contributions of electron spin fluctuations and lattice vibrations above approximately 2.0K. The magnetization shows a linear relationship with magnetic field above 1000 Oe, which is in agreement with previous reports. The results agree with the calculations based on the spin fluctuation theory.
社団法人日本物理学会の論文
2008-04-15