NDLI: Magnetic Impurities in Glass and Silver Powder at Milli- and Microkelvin Temperatures

Content Provider	Springer Nature Link
Author	Herrmannsdörfer, T. König, R.
Copyright Year	2000
Abstract	In search of an ideal paramagnet for thermometry at very low temperatures, we have studied the magnetic behaviour of impurity moments (localized Fe$^{3+}$, impurity concentration x = (180±10) ppm) dissolved in a structural borosilicate glass, in the temperature range 0.07 ≤ T ≤ 300 mK by means of dynamic ac susceptibility, and at 1.6≤T ≤ 300 K by static dc magnetization. In order to improve the thermal coupling of the insulating glass at the lowest temperatures, it was pulverized and mixed with silver powder of submicron grain size; the composite was subsequently compacted to a cylindrical sample by applying a pressure of a few kbar. This contact method which is applicable to other materials with bad thermal conductivity as well improved the accessible minimum temperature for the glass down to ≃0.1 mK. At low temperatures, we observe a Curie Weiss law for the dynamic susceptibility χ of the magnetic Fe$^{3+}$ impurities in the glass down to ≈0.6 mK, a broad maximum of χ at T ≃ 0.38 mK and a decrease towards even lower temperatures. Compared to the frequently used, highly diluted metallic spin glasses, the magnetic behaviour of the glass makes inductance thermometry applicable in a much larger temperature range. In addition, we have investigated the low temperature magnetic properties of a sample of compacted silver powder. The small amount of paramagnetic impurities in the Ag particles (x = (4 ± 1) ppm) exhibits a low temperature susceptibility which can be described by the Kondo effect with an unexpectedly small Kondo temperature of T $_{K}$ ≃ 1 mK.
Starting Page	45
Ending Page	57
Page Count	13
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	118
Issue Number	1-2
e-ISSN	15737357
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2000-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Characterization and Evaluation Materials Condensed Matter Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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