Hyperbolic Dependence of 2Δ 0 vs. T c Ratio on Hole-Doping Level in High-T c Cuprates: Energy Scale in Determining T c
Hyperbolic Dependence of 2Δ 0 vs. T c Ratio on Hole-Doping Level in High-T c Cuprates: Energy Scale in Determining T c
复制标题
2Δ 0 与 T c 比率对高 T c 铜氧化物空穴掺杂水平的双曲线依赖性：确定 T c 的能量尺度
DOI：
10.1143/jpsj.69.983
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发表时间：
2000
影响因子：
1.7
通讯作者：
M. Ido
中科院分区：
文献类型：
--
作者：
M. Oda;R. M. Dipasupil;N. Momono;M. Ido
这种表达式（Tc∝pΔ0）是Wen和Lee在tJ模型的SU(2)从玻色子公式的基础上首次提出的，其中电子自旋和电荷自由度在正常状态下分离，表现为费米子（自旋）和玻色子（全息）。9)他们已经证明，对于低掺杂铜酸盐，SU(2)规波动引起费米子和玻色子之间的吸引相互作用，在（π/2, π/2）附近诱导出一个小的洞袋，向（π, 0）和（0,π）方向延伸，长度为p阶，由于自旋子配对，在自旋间隙状态下，该间隙的k依赖性变得类似于在Bi2212中观察到的PG。在他们的模型中，当单个玻色子或玻色子对在Tc以下凝聚时，空穴袋以类似bcs的方式出现间隙，并且间隙从PG发展成d波SC间隙（DSG）。他们还表明，基于这种SC转变情景，T-线性超流体密度ns (T)中的因子a = p−(a /Δ0) T，这是基于ns (0)= p和准粒子的假设推导出来的
Such an expression (Tc∝ pΔ0) was first proposed by Wen and Lee on the basis of the SU (2) slave-boson formulation of the tJ model, in which the electron spin and charge degrees of freedom are separated in the normal state and behave as a fermion (spinon) and a boson (holon). 9) They have shown for underdoped cuprates that the SU (2) gauge fluctuations, causing an attractive interaction between the fermion and the boson, induce a small hole pocket near (π/2, π/2), extending towards (π, 0) and (0, π) with a length of order p, in a spin gap state due to spinon paring, and the k dependence of the gap becomes similar to that of the PG observed in Bi2212. In their model, as single bosons or boson pairs condense below Tc, the hole pocket is gapped in a BCS-like fashion and the gap develops from the PG into a d-wave SC gap (DSG). They have also shown, on the basis of such a SC transition scenario, that factor A in T-linear superfluid density ns (T)= p−(A/Δ0) T, which is deduced based on the assumptions that ns (0)= p and the quasiparticle