Top-loading small-sample calorimeters for measurements as a function of magnetic field angle

[摘要] In quasi-low-dimensional systems, the existence of a particular physical state and the temperature and magnetic-field-dependence of its phase boundary often strongly depends on magnetic field orientation. To investigate magnetic field orientation dependent phase transitions in these materials, we have developed rotatable miniature and sub-miniature sample-in-vacuum calorimeters that operate in dc magnetic fields up to 18 and 45 tesla. The calorimeters cover the temperature range from below 0.1 K to above 10 K; they are able rotate a full 360 degrees relative to the applied magnetic field while remaining at base temperature. Samples are typically on the order of 1 mg in mass and up to 2 mm2× 0.5 mm in volume.

[发布机构] Department of Physics, Smith College, College Lane, Northampton; MA; 01063, United States^1;National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Road, Tallahassee; FL; 32310, United States^2

[关键词] Applied magnetic fields;Base temperature;DC magnetic field;Low-dimensional systems;Magnetic field angle;Magnetic field dependences;Magnetic field orientations;Temperature range