تقرير
Fermionic van Hemmen Spin Glass Model with a Transverse Field
| العنوان: | Fermionic van Hemmen Spin Glass Model with a Transverse Field |
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| المؤلفون: | Magalhaes, S. G., Zimmer, F. M., Morais, C. V. |
| سنة النشر: | 2010 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | In the present work it is studied the fermionic van Hemmen model for the spin glass (SG) with a transverse magnetic field $\Gamma$. In this model, the spin operators are written as a bilinear combination of fermionic operators, which allows the analysis of the interplay between charge and spin fluctuations in the presence of a quantum spin flipping mechanism given by $\Gamma$. The problem is expressed in the fermionic path integral formalism. As results, magnetic phase diagrams of temperature versus the ferromagnetic interaction are obtained for several values of chemical potential $\mu$ and $\Gamma$. The $\Gamma$ field suppresses the magnetic orders. The increase of $\mu$ alters the average occupation per site that affects the magnetic phases. For instance, the SG and the mixed SG+ferromagnetic phases are also suppressed by $\mu$. In addition, $\mu$ can change the nature of the phase boundaries introducing a first order transition. Comment: 9 pages, 4 figures, accepted for publication in Phys. Lett. A |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.physleta.2010.06.051 |
| URL الوصول: | http://arxiv.org/abs/1007.1636 |
| رقم الأكسشن: | edsarx.1007.1636 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.physleta.2010.06.051 |
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