Abstract
We propose a model of radiofrequency (rf) superradiance by a system of interacting nonequivalent spins in a point specimen. In contrast to the rf superradiance observed and described earlier, here spin-spin coupling acts as the interaction with the cavity. To be definite, we examine the spins of two isotopes of a metal that are coupled by the Ruderman-Kittel interaction. The analysis of such a system when the magnetization of one spin species is inverted shows that the system can have one resonance frequency and two different decay times, instead of two resonance frequencies and one decay time in the usual situation. When such “repulsion” of decay times occurs and the absolute values of the spin polarizations are large, transverse magnetization increases and exhibits features characteristic of superradiance. Finally, we calculate the parameters of this superradiance: the voltage across the terminals of an rf pickup coil, the pulse length, the delay time, and the superradiant intensity.
Similar content being viewed by others
References
A. S. Oja, A. J. Annila, and Y. Takano, Phys. Rev. Lett. 65, 1921 (1990).
P. J. Hakonen, K. K. Nummila, and R. T. Vuorinen, Phys. Rev. B 45, 2196 (1992).
G. Eska and E. Schuberth, Jpn. J. Appl. Phys. 26, Suppl. No. 3, 435 (1987).
G. Eska, in Proc. Conf. on Quantum Fluids and Solids, Gainesville, 1989, G. G. Ihas, and Y. Takano (eds.), AIP Conf. Proc. 194.
Shin-ichi Kuroda, M. Motokawa, and M. Date, J. Phys. Soc. Jpn. 61, 1036 (1992).
P. Bosiger, E. Brun, and D. Meier, Phys. Rev. B 18, 671 (1978).
Yu. F. Kiselev, A. F. Prudkoglyad, A. S. Shumovskii, and V. I. Yukalov, Zh. Éksp. Teor. Fiz. 94, No. 2, 344 (1988) [Sov. Phys. JETP 67, 413 (1988)].
N. A. Bazhanov, D. S. Bulyanitsa, A. I. Zaitsev, A. I. Kovalev, V. A. Malyshev, and E. D. Trifonov, Zh. Éksp. Teor. Fiz. 97, 1995 (1990) [Sov. Phys. JETP 70, 1128 (1990)].
N. P. Fokina, K. O. Khutsishvili, and S. G. Chkhaidze, Zh. Éksp. Teor. Fiz. 102, 1013 (1992) [Sov. Phys. JETP 75, 552 (1992)].
A. V. Andreev, Usp. Fiz. Nauk 160, No. 12, 1 (1990) [Sov. Phys. Usp. 33, 997 (1990)].
R. H. Dicke, Phys. Rev. 93, 99 (1954).
N. Skribanovitz, I. P. Hermann, J. C. MacGillivray, and M. S. Feld, Phys. Rev. Lett. 30, 309 (1973).
J. C. MacGillivray and M. S. Feld, Phys. Rev. A 14, 1169 (1976).
R. Bonifacio and L. A. Lugiato, Phys. Rev. A 11, 1507 (1975).
Yu. V. Naboikin, V. V. Samartsev, P. V. Zinov’ev, and N. B. Silaeva, Coherence Spectroscopy of Molecular Crystals [in Russian], Nauka Dumka, Kiev (1986).
Yu. S. Karimov and I. F. Shchegolev, Zh. Éksp. Teor. Fiz. 41, 1082 (1961) [Sov. Phys. JETP 14, 772 (1962)].
J. P. Estrom, J. F. Jacquinot, M. T. Loponen, J. K. Soini, and P. Kumar, Physica B & C 98, 45 (1979).
R. H. Pantell and H. E. Puthoff, Fundamentals of Quantum Electronics, Wiley, New York (1969).
L. Flepp, PhD Thesis, Zürich University (1991).
R. Badii, E. Brun, M. Finardi, L. Flepp, R. Holzner, J. Parisi, C. Reyl, and J. Simonet, Rev. Mod. Phys. 66, 1389 (1994).
N. N. Bogolyubov and Yu. A. Mitropol’skii, Asymptotic Methods in the Theory of Nonlinear Oscillations [in Russian], 4th ed., Nauka, Moscow (1974).
H. Haken, Advanced Synergetics. Instability Hierarchies of Self-Organizing Systems and Devices, Springer, Berlin (1983).
R. M. Pomerantsev, V. M. Ryzhkov, and G. V. Skrotskii, Physical Bases of Quantum Magnetometry [in Russian], Nauka, Moscow (1972).
N. P. Fokina, K. O. Khutsishvili, S. G. Chkhaidze, A. M. Lomidze, Fiz. Tverd. Tela (St. Petersburg) 37, 1910 (1995) [Phys. Solid State 37, 1040 (1995)].
T. Sleater, E. L. Hahn, C. Hilbert, and J. Clarke, Phys. Rev. Lett. 55, 1742 (1985).
Author information
Authors and Affiliations
Additional information
Zh. Éksp. Teor. Fiz. 112, 551–563 (August 1997)
Rights and permissions
About this article
Cite this article
Kostarov, D.A., Fokina, N.P. & Khutsishvili, K.O. Superradiance by a system of highly polarized exchange-coupled nonequivalent spins. J. Exp. Theor. Phys. 85, 300–306 (1997). https://doi.org/10.1134/1.558278
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1134/1.558278