Abstract
It is shown that a sequence of processes is possible in ferroelectrics, analogous to those which occur when a saturated paramagnetic material is cooled under adiabatic depolarization conditions, and it becomes a ferromagnetic material. The conditions required to construct a dielectric calorimeter with an extremely high sensitivity of 0.04 eV/Hz 1/2 are considered. The development of methods of measuring extremely small energy releases �£ E is an extremely important area in general physics, technology, and metrology. The general physics signifi cance of recording �£ E is illustrated most clearly in the possibility of solving the fundamental problem of fi nding elementary particles, Dark Matter particles (1), and other particles which interact very weakly with materials both massive (WIMP) and massless (radiation quanta with extremely small inter- action cross sections (2)). In technology, the recording and measurement of extremely small energy releases are important for developing methods of special communications (2, 3), long-distance location of space objects (4, 5), and also for solving a number of other problems of an applied nature. In metrological applications, an increase in the accuracy of the measurement of �£ E would enable the resolving power of single-quantum x-ray spectrometers, employed as analyzers of the composition of microsamples (6), for the contact-free monitoring of the state of nuclear objects, etc., to be increased. In (7-10), the action of a SQUID-paramagnetic adsorber (SPA) as a highly sensitive radiation detector under condi- tions when such a microcalorimetric system operates in an adiabatic demagnetization cycle was demonstrated. An extremely small energy release �£ E, for example, as a consequence of the interaction of an elementary particle with a material, gives an increase in entropy �£ S = �£ E/T �> O B�£ M/T, which leads to a reduction in the magnetic moment of the adsorber. (Here T is the absolute temperature, and M is the magnetization) (11). The minimum effective value of the induction B, attainable when cooling with adiabatic demagnetization, is close to the residual induction B min �> B res �4 0. For a cylindrical paramagnetic ad- sorber of height l, a reduction �£ M in its transverse cross section causes a change in the magnetic fl ux of b\ = + 0 b M/l, where �´ 0 = 4o ·10 O 7 H/m is the magnetic permeability of free space. Finally, a change in the fl ux recorded by a SQUID is (7-10):
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
