Investigation of the spin glass transition in a low U doped YRu 2 Si 2 sample

Investigation of the spin glass transition in a low U doped YRu 2 Si 2 sample. Ocko, M., Drobac, D., Park, J., Samardzija, Z., & Zadro, K. Journal of Physics: Condensed Matter, 15(26):4613-4621, 7, 2003.

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We have made extensive studies of a dilute U doped YRu2Si2 alloy using several experimental techniques such as ac and dc magnetic susceptibility, dc resistivity and microstructural investigations. The real part of the ac susceptibility shows a maximum at around 6.75 K for f = 7 Hz. With increasing frequency, the temperature of this maximum increases while, at the same time, the magnitude of the maximum decreases, which is a typical spin glass behaviour. The magnitude of the imaginary part shows frequency-dependent behaviour too. We show that most of the imaginary part of the susceptibility, at least over the range of the frequencies we used, comes from the conduction electrons. Zero-field cooling and field cooling dc magnetization measurements also indicate the presence of a spin glass transition at about the same temperature. We also found that relaxation processes below the freezing temperature show ln(t + to) behaviour. We discuss our findings in light of the origin of the spin glass behaviour and compare them with other similar studies.

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 abstract = {We have made extensive studies of a dilute U doped YRu2Si2 alloy using several experimental techniques such as ac and dc magnetic susceptibility, dc resistivity and microstructural investigations. The real part of the ac susceptibility shows a maximum at around 6.75 K for f = 7 Hz. With increasing frequency, the temperature of this maximum increases while, at the same time, the magnitude of the maximum decreases, which is a typical spin glass behaviour. The magnitude of the imaginary part shows frequency-dependent behaviour too. We show that most of the imaginary part of the susceptibility, at least over the range of the frequencies we used, comes from the conduction electrons. Zero-field cooling and field cooling dc magnetization measurements also indicate the presence of a spin glass transition at about the same temperature. We also found that relaxation processes below the freezing temperature show ln(t + to) behaviour. We discuss our findings in light of the origin of the spin glass behaviour and compare them with other similar studies.},
 bibtype = {article},
 author = {Ocko, M and Drobac, Dj and Park, J-G and Samardzija, Z and Zadro, K},
 journal = {Journal of Physics: Condensed Matter},
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