Journal of the Physical Society of Japan · 1985 · 41 citations · 8 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsThermodynamicsFerromagnetic MaterialsFerromagnetismMagnetic Properties Of SolidsMagnetic SusceptibilityMagnetism In SolidsThermal Expansion AnalysisItinerant MagnetismLinear Thermal ExpansionRenormalization GroupRenormalization TheorySpin FluctuationsTemperature Dependence Of Magnetic PropertiesThermal ExpansionThermal Expansion Coefficient
Thermal expansion in the itinerant electron magnetic Ni 3 Al system has been measured at temperatures 4.2 K≤ T ≤60 K. In the ferromagnetic samples (74.6, 75.0 and 75.2 at%Ni) in this system, a linear thermal expansion coefficient α shows a jump at the respective T c , and the behavior of α in the temperature region near the respective T c is well explained by the self-consistent renormalization (SCR) theory of spin fluctuations by Moriya and Usami. In the paramagnetic sample (74.0 at%Ni) the behavior of α is also explained by this theory very well. Moreover the inverse magnetic susceptibility, χ -1 in the paramagnet shows the T 4/3 -dependence in the region of high temperatures T ≥13 K and the T 2 -dependence below about 13 K. In the ferromagnets χ -1 shows the T 4/3 -dependence above the respective T c . These facts agree with the prediction by the SCR theory of spin fluctuations.
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