Leggett mode in a strong-coupling model of iron arsenide superconductors

In recent years the nucleus 51 Y has been extensively studied, both experimentally by Horoshko et al. (1970), using the 48Ti(oc, py)51y reaction, and theoretically in terms of shell model calculations by many authors (McCullen et al. 1964; Horoshko et al. 1970; Lips and McEllistrem 1970). Mixed configuration shell model calculations by Lips and McEllistrem, in particular, have successfully reproduced the low-lying energy levels of5ly. However, strong coupling rotational model calculations by Malik and Scholz (1966) did not give satisfactory results. In the present work, the intermediate coupling unified model (Bohr and Mottelson 1953; Choudhury 1954) is applied to Sly. The purpose of this work is to show that the intermediate coupling model can successfully predict the low-lying energy levels of Sly.

Download Full-text

Theory of Superconducting Fluctuations in the Strong Coupling Model

Fluctuation Phenomena in High Temperature Superconductors ◽

10.1007/978-94-011-5536-6_30 ◽

1997 ◽

pp. 369-376

Author(s):

B. N. Narozhny

Keyword(s):

Strong Coupling ◽

Coupling Model ◽

Superconducting Fluctuations

Download Full-text

An extended “strong-coupling” model of the IR spectral properties of molecular crystals with four H-bonds in a unit cell: the imidazole-type crystals

Journal of Molecular Structure ◽

10.1016/0022-2860(95)08993-4 ◽

1995 ◽

Vol 372 (2-3) ◽

pp. 229-240 ◽

Cited By ~ 11

Author(s):

Henryk T. Flakus ◽

Aleksandra Bryk

Keyword(s):

Strong Coupling ◽

Spectral Properties ◽

Molecular Crystals ◽

Coupling Model ◽

Unit Cell

Download Full-text

Parameter Adaptive Terminal Sliding Mode Control of Flexible Coupling Air-Breathing Hypersonic Vehicle

International Journal of Aerospace Engineering ◽

10.1155/2020/9430272 ◽

2020 ◽

Vol 2020 ◽

pp. 1-17 ◽

Cited By ~ 1

Author(s):

Haibing Chen ◽

Wei Lin ◽

Tielin Ma ◽

Hengxian Jin ◽

Cheng Xu

Keyword(s):

Strong Coupling ◽

Sliding Mode ◽

Coupling Model ◽

Hypersonic Vehicle ◽

Control Law ◽

Terminal Sliding Mode ◽

Flexible Coupling ◽

Air Breathing ◽

Highly Nonlinear ◽

Parameter Adaptive

The highly nonlinear and coupling characteristics of a flexible air-breathing hypersonic vehicle create great challenges to its flight control design. A unique parameter adaptive nonsingular terminal sliding mode method is proposed for longitudinal control law design of a flexible coupling air-breathing hypersonic vehicle. This method uses adaptive reaching law gain instead of the additional adaptive compensation term to handle the uncertainty to improve robustness. The stability of the close loop system is proved via a Lyapunov way. The longitudinal tracking control law for velocity and angle of attack is designed based on a rigid dynamic model of a flexible air-breathing hypersonic vehicle. A strong coupling model of the same vehicle, considering aerodynamic-scramjet engine-flight dynamic-elastic couplings, is established as the verification platform of the designed control law. The remarkable differences of flight dynamic characteristics between this strong coupling model and the rigid body model can be seen, which mean the controller needs to endure very great uncertainty, unmodeled dynamics, and other types of internal disturbance. Simulation results based on the coupling model demonstrate that the designed control law has good performance and acceptable robustness.

Download Full-text

Collective States in 151Sm

Canadian Journal of Physics ◽

10.1139/p71-377 ◽

1971 ◽

Vol 49 (24) ◽

pp. 3166-3173 ◽

Cited By ~ 18

Author(s):

D. E. Nelson ◽

D. G. Burke ◽

W. B. Cook ◽

J. C. Waddington

Keyword(s):

Strong Coupling ◽

Gamma Rays ◽

Cross Sections ◽

Rotational Band ◽

Ground State ◽

Coulomb Excitation ◽

Coupling Model ◽

Deuteron Scattering ◽

Collective States

Inelastic deuteron scattering experiments with a target of 151Sm have been carried out with bombarding energies of 5 MeV and 12 MeV. The scattered deuterons were analyzed with a magnetic spectrograph and B(E2) values for the states populated were extracted from the ratios of inelastic to elastic cross sections. The gamma rays following Coulomb excitation of 151Sm by 50 MeV 35Cl ions were also studied with Ge(Li) detectors. Levels at 65.8 keV, 168.4 keV, and 295.1 keV were populated with B(E2) values of 0.80 e2(barn)2, 0.15 e2(barn)2, and 0.46 e2(barn)2 respectively. If it is assumed that the strong-coupling model is appropriate and that the level at 65.8 keV is the first excited member of a rotational band based on the I = 5/2 ground state, the measured B(E2) value corresponds to a deformation of β = 0.21. It must be noted, however, that the observed states do not satisfy the properties expected for a well-ordered ground-state rotational band.

Download Full-text