کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1591221 1515564 2016 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantum Monte Carlo simulation of antiferromagnetic spin ladder (C5H12N)2CuBr4
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Quantum Monte Carlo simulation of antiferromagnetic spin ladder (C5H12N)2CuBr4
چکیده انگلیسی


• Spin ladder antiferromagnetic compounds and low dimensional magnetism.
• Quantum Monte Carlo simulation and the Heisenberg model.
• Spin gap calculation, susceptibilitiy phase diagram and high magnetic fields.
• Stochastic Series Expansion (SSE) method and low temperature magnetism.

In this paper I present a Quantum Monte Carlo (QMC) study of the magnetic properties of an antiferromagnetic spin ladder (C5H12N)2CuBr4. This compound is the prototype of the Heisenberg model for a two leg spin ladder in the presence of an external magnetic field. The susceptibility phase diagram has a rounded peak in the vicinity of T=7.4 K, obeys Troyer׳s law for low temperatures, and Curie׳s law for high temperatures. I also study the susceptibility diagram in low temperatures and I found the spin gap Δ=9.26 K, in good concordance with the experimental value, 9.5 K. In high field, I present a diagram of magnetization as a function of temperature. In the vicinity of a critical field, Hci, the magnetization scales with T1/2 and this result was found also in the QMC simulation. In all the results, there is a very good concordance with the experimental data. I also show in this paper that the spin gap is null and the susceptibility is proportional to T for low temperatures when relatively high values of the ladders’ coupling is taken in account.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volumes 237–238, July 2016, Pages 38–41
نویسندگان
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