Suszeptibilit�t und elektrische Leitf�higkeit von Kupfer-Mangan-Legierungen

Valentiner, Siegfried; Becker, G.

doi:10.1007/bf01342589

Cited by 47 publications

(3 citation statements)

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“…While T f changes little relative to χ(T f ), the trend to higher temperatures is unequivocal, and linear in log(t) within the resolution of the measurement. Comparing T f = 76.5 K after nearly 100 h with the value of 82 K in the irradiated sample, we can roughly estimate that continued aging at 100 • C could require another 5 1 2 decades of time, or 10 9 s, to achieve the same result, in good qualitative agreement with the 2 × 10 9 s SRO relaxation time estimated in [27].…”

Section: Change In T F During Orderingsupporting

confidence: 74%

“…Copper-manganese alloys containing roughly 10-40 at.% Mn were found by Valentiner and Becker [1] to have interesting magnetic properties, manifest as a peak in the magnetization measured at low temperatures, which could be increased by aging, with maximum effect at about 22 at.% Mn. This was confirmed by Scheil and Wachtel [2], who made a comprehensive study of the effects of aging at temperatures between 100 • C and 200 • C. It was also shown that plastic deformation decreases the magnetization, and they concluded that an ordering process takes place.…”

Section: Introductionmentioning

confidence: 96%

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A magnetization study of the development of short-range order in a concentrated - Mn spin glass

Gray

1996

J. Phys.: Condens. Matter

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The kinetics of short-range order (SRO) growth in a Cu - 16.4 at.% Mn alloy have been studied by measuring the evolution with time of the low-temperature magnetic properties while aging at temperatures around 100 . This new approach was possible because atomic SRO leads to magnetic clustering at this Mn concentration. Several models, all based on the diffusion of vacancies and their annihilation in fixed sinks, implied that the sink density was higher at 115 than at 100 for identical quenching conditions. It was concluded that the quenched-in vacancies condense in clusters. These act as sinks, halting the growth of SRO when the excess quenched-in vacancies have been absorbed. Quenching faster or aging at a higher temperature nucleates more vacancy clusters, causing earlier vacancy exhaustion. Neutron irradiation was used to continuously supply vacancies, thereby driving the SRO process to equilibrium at about 100 . A much higher magnetic susceptibility was attained than previously reported, some 20 times the as-quenched value at the spin freezing temperature.

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