Contributions at the La and Sn—In Sites to Superconductivity and Magnetism in LaSnx In3−x Alloys
The bulk properties of the LaSn x In3−x ternary alloys have been found to have a strong, somewhat oscillatory dependence upon the electron/atom (e/a) ratio.1-4 The superconducting transition temperature TT varies from 0.68°K in LaIn3 to a minimum at x = 0.375, a maximum of 1.3°K at x = 1.5, a second minimum at x = 2.3 and a rapid rise to 6.55°K in LaSn3.1−3 The bare electronic density of states N(0) determined from specific heat measurements (after correction for the electron—phonon enhancement factor) has the same qualitative variation with composition.2,3 The normal-state magnetic susceptibility x varies between paramagnetic and diamagnetic behavior in a complex fashion, but in a rough way it also appears to correlate with composition not unlike N(0) and T c .2,3.5 As Havinga et al.1 have shown, this type of oscillatory behavior with the e/a ratio is fairly typical of the alloys of the form MA x B3−x which exist in the AuCu3 phase (M = IIIB transition metal and A, B = Sn, In, Pb, TI).
KeywordsNuclear Magnetic Resonance Nuclear Magnetic Resonance Data Knight Shift Nuclear Magnetic Resonance Measurement Pulse Nuclear Magnetic Resonance
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- 2.A. M. Toxen, R. J. Gambino, and B. J. C. van der Hoeven, Jr., in Proc. 12th Intern. Conf. Low Temp. Phys., 1970, Academic Press of Japan, Tokyo (1971), p. 351.Google Scholar
- 3.J.L. Levine et al. (to be published).Google Scholar
- 6.L. B. Welsh, A. M. Toxen, and R. J. Gambino, Phys. Rev. B 42921 (1971)Google Scholar
- L. B. Welsh, A. M. Toxen, and R. J. Gambino, Phys. Rev. B 6 1677 (1972).Google Scholar