کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9727572 | 1480204 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermodynamics of the S=1 spin ladder as a composite S=2 chain model
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
فیزیک ریاضی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Thermodynamics of the S=1 spin ladder as a composite S=2 chain model Thermodynamics of the S=1 spin ladder as a composite S=2 chain model](/preview/png/9727572.png)
چکیده انگلیسی
A special class of S=1 spin ladder Hamiltonians, with second-neighbor exchange interactions and with anisotropies in the z-direction, can be mapped onto one-dimensional composite S=2 (tetrahedral S=1) models. We calculate the high temperature expansion of the Helmoltz free energy for the latter class of models, and show that their magnetization behaves closely to that of standard XXZ models with a suitable effective spin Seff, such that Seff(1+Seff)=ãSâi2ã, where Si refers to the components of spin in the composite model. It is also shown that the specific heat per site of the composite model, on the other hand, can be very different from that of the effective spin model, depending on the parameters of the Hamiltonian.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica A: Statistical Mechanics and its Applications - Volume 356, Issues 2â4, 15 October 2005, Pages 575-588
Journal: Physica A: Statistical Mechanics and its Applications - Volume 356, Issues 2â4, 15 October 2005, Pages 575-588
نویسندگان
Onofre Rojas, E.V. Corrêa Silva, S.M. de Souza, M.T. Thomaz,