Heat capacity measurements by adiabatic method are effective for discussion fundamental properties of condensed matters. We have developed a 3He adiabatic apparatus available in our superconducting magnets with a bore diameter of φ50 mm. The sample stage is consistent of sapphire plate on which we can attach bulk sample or sample holder. The temperature of adiabatic shield connected to the 3He pot is controllable to follow the sample temperature. A mechanical-type switch to cool the system down to 0.4 K is installed in the cryostat using a stainless bellow. We have set up a Cernox thermometer available under magnetic fields to detect anomalous charge and spin fluctuations of organic charge transfer complexes.
|
Fig. 1. Schematic illustration of the apparatus. The sample stage is surrounded by a Cu shield of which temperature can be controlled to follow the sample temperature. A mechanical-type switch to cool down the sample stage is installed. |
|
Photo. 1. A photo picture of the 3He apparatus. (a) Room temperature part. The micrometer is the operator of the mechanical switch. (b) Inside view of the vacuum can. |