Dimensional crossover in Sr2RuO4 within a slave-boson mean-field theory
Dimensional crossover in Sr2RuO4 within a slave-boson mean-field theory
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DOI：
10.1209/0295-5075/85/27011
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发表时间：
2008-12
期刊：
影响因子：
--
通讯作者：
Mark H. Fischer;M. Sigrist
中科院分区：
文献类型：
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作者：
Mark H. Fischer;M. Sigrist
基于Sr 2 RuO 4的c轴电阻率与温度的反常关系，研究了由于垂直链之间的弱杂化而导致的一维链网络向二维链网络的维度交叉.相应的双轨道Hubbard模型被处理在一个从玻色子平均场理论（SBMFT），以考虑相关效应，如自旋-电荷分离的一维链。利用RPA类配方的集体自旋-空穴激发的绿色的功能出现准粒子在低温下检查。结果被用来讨论的频谱密度和c轴运输内的隧道方法的演变。对于后者的制度之间的变化，低温和高温制度的定性实验数据。
Motivated by the anomalous temperature dependence of the c-axis resistivity of Sr$_2$RuO$_4$, the dimensional crossover from a network of perpendicular one-dimensional chains to a two-dimensional system due to a weak hybridization between the perpendicular chains is studied. The corresponding two-orbital Hubbard model is treated within a slave-boson mean-field theory (SBMFT) to take correlation effects into account such as the spin-charge separation on the one-dimensional chains. Using an RPA-like formulation for the Green's function of collective spinon-holon excitations the emergence of quasiparticles at low-temperatures is examined. The results are used to discuss the evolution of the spectral density and the c-axis transport within a tunneling approach. For the latter a regime change between low- and high-temperature regime is found in qualitative accordance with experimental data.