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>Variable frequency twohyphen;phase ac susceptometer for use in dc bias fields over the temperature range of 4.2 to 300 K
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Variable frequency twohyphen;phase ac susceptometer for use in dc bias fields over the temperature range of 4.2 to 300 K
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机译：Variable frequency twohyphen;phase ac susceptometer for use in dc bias fields over the temperature range of 4.2 to 300 K
A system has been designed and constructed in order to detect differential ac susceptibility as a function of temperature between 4.2 and 300 K. A dc bias field in the range of 0ndash;50 kOe is provided by a superconducting magnet. The available ac field range is 0ndash;1 Oe. Using the reference source of a PAR lockhyphen;in amplifier, the measurements can be carried out in a frequency range of 0.1ndash;10 kHz. A differential amplifier circuit is used to accurately detect the susceptibility signal. As this provides both inhyphen;phase and outhyphen;ofhyphen;phase compensating signals, both the real and imaginary components of the susceptibility can be detected even when using a singlehyphen;phase lockhyphen;in amplifier. The circuit diagram and principle of operation as well as the calibration procedure and data processing methods are described in detail.
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