Helium-Gaskryostat zur Messung der optischen Doppelbrechung bei magnetischen und strukturellen Phasenübergängen*

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Abstract
A helium-gas cryostat for measurements of the temperature dependence of the optical birefringence between 4.2 and 600 K is presented. The results at the magnetic phase transitions of MnWO4 and NiF2 are shortly discussed.