کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8201877 | 1529848 | 2015 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Leggett's modes in magnetic systems with Jahn-Teller distortion
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Leggett's mode is a collective excitation corresponding to the oscillation of the relative phase of the order parameters in a two band superconductor, with frequency proportional to interband coupling. We report on the existence of modes, similar to Leggett's mode, in magnetic systems with Jahn-Teller distortion. The minimal Kugel-Khomskii model, which describes simultaneously both the spin and the orbital order, is studied. The dynamical degrees of freedom are spin-s operators of localized spins and pseudospin-Ï operators, which respond to the orbital degeneracy and satisfy the similar commutation relation with those of the spin operators. In the case of “G-type antiferro” spin and pseudospin order the system possesses two antiferromagnetic magnons with equal spin-wave velocities and two Leggett's modes with equal gaps proportional to the square root of the spin-pseudospin interaction constant. In the case of “ferro” spin and pseudospin order the system possesses one ferromagnetic magnon and one Leggett's mode with gap proportional to the spin-pseudospin interaction constant. We conclude that Leggett's modes, in the spectrum of the magnetic systems with Jahn-Teller distortion, are generic features of these systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Physics - Volume 363, December 2015, Pages 371-384
Journal: Annals of Physics - Volume 363, December 2015, Pages 371-384
نویسندگان
Naoum Karchev,