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arXiv 2011.11051cond-mat.stat-mech
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各向同性Blume-Emery-Griffiths模型的Ruppeiner几何

Ruppeiner geometry of isotropic Blume-Emery-Griffiths model

Rıza Erdem, Nigar Alata

摘要:

借助于定义在偶极($m$)和四极($q$)序参量二维相空间上的Ruppeiner热力学度规,我们导出了各向同性Blume-Emery-Griffiths模型中Ricci标量($R$)的表达式.研究了不同双线性双二次比($r$)值下$R$的温度依赖性。在连续/不连续相变温度和三临界点附近的行为。发现除了与相变有关的发散奇异性和有限跳跃外,Ricci标量中还存在与场相关的宽极值。

英文摘要:

With the aid of Ruppeiner thermodynamic metric defined on a two-dimensional phase space of dipolar ($m$) and quadrupolar ($q$) order parameters, we derive an expression for the Ricci scalar ($R$) in the isotropic Blume-Emery-Griffiths model. Temperature dependence of $R$ is investigated for various values of bilinear to biquadratic ratio ($r$). Its behavior near the continuous/discontinuous phase transition temperatures and a tricritical point is presented. It is found that in addition to the divergence singularity and finite jumps connected with the phase transitions there are field-dependent broad extrema in the Ricci scalar.

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