Dilution Microcryostat–Insert for Microwave Spectroscopy and Magnetic Resonance

An autonomous dilution microrefrigerator manufactured as an insert into a helium cryostat with a superconducting magnet is described. In this refrigerator, the 3 He circulation in the circuit filled with a 3 He– 4 He mixture (mixer–heat exchanger–still–condenser–heat exchanger–mixer) is achieved due...

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Bibliographic Details
Published in:Instruments and experimental techniques (New York) 2022-08, Vol.65 (4), p.668-679
Main Authors: Smirnov, A. I., Soldatov, T. A., Edelman, V. S.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Circuits
Conductors
Dilution
Electrical Engineering
Heat exchangers
Laboratory Techniques
Magnetic materials
Magnetic resonance
Magnetism
Measurement Science and Instrumentation
Microwave spectroscopy
Mixtures
Physical Chemistry
Physics
Physics and Astronomy
Resonators
Room temperature
Single crystals
Solenoids
Spectrum analysis
Superconductivity
Waveguides
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Summary:An autonomous dilution microrefrigerator manufactured as an insert into a helium cryostat with a superconducting magnet is described. In this refrigerator, the 3 He circulation in the circuit filled with a 3 He– 4 He mixture (mixer–heat exchanger–still–condenser–heat exchanger–mixer) is achieved due to the condensation of mixture vapors on the walls of the condenser, which is cooled by the 3 He bath pumped out by a sorption pump, as well as entry of the condensate into the mixer under the action of gravity. An 8-mm-range resonator that contains a sample is connected to the mixer via a heat conductor; the sample is located at the center of a superconducting solenoid with a field of up to 80 kOe. Radiation passes from the generator through a waveguide to the resonator, and the signal that passed through the resonator arrives at the detector. The generator and detector are at room temperature. The device is designed for microwave spectroscopy of magnetic materials at temperatures in the range of ~0.09–3 K. The time within which the temperature is maintained at a level of ~0.1 K is 4–6 h. The results of a test experiment on the antiferromagnetic resonance in a MnCO 3 single crystal are presented.
ISSN:0020-4412
1608-3180
DOI:10.1134/S0020441222040236