Abstract
Nuclear magnetic resonance of Ni61 has been studied in pure nickel metal (of natural isotope composition) in the vicinity of the Curie point. The temperature dependence of NMR frequency has been measured up to 0·96T c. Determination ofT c was aided by initial susceptibility measurements. The analysis of these results yields β=0·336±0·002 for the critical exponent describing the decrease of spontaneous magnetization to zero atT c. This value ofβ is in excellent agreement with the corresponding values obtained from NMR experiments in ferromagnetic EuS and antiferromagnetic MnF2, it differs, however, from the values obtained for nickel by other methods. In a general discussion of this problem which uses the theoretical relations between various critical exponents the earlier data, in particular those of Weiss and Forrer, are reexamined.
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It is a pleasure for the authors to acknowledge the valuable advice and helpful comments of Professor J. Brož and Dr. J. Šternberk. They are indebted also to Dr. V. Houdek for help with the susceptibility measurements, which were performed on his apparatus.
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Rotter, M., Sedlák, B. Spontaneous magnetization from NMR measurements and critical exponents in nickel. Czech J Phys 20, 1285–1291 (1970). https://doi.org/10.1007/BF01734716
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DOI: https://doi.org/10.1007/BF01734716