Induced local spin-singlet amplitude and pseudogap in high $T_c$ cuprates

Abstract

In this paper we show that local spin-singlet amplitude with d-wave symmetry, $<|{\Delta }_d(0){|}^2>$, can be induced by short-range spin correlations even in the absence of pairing interactions. Fluctuation theory is formulated to make connection between pseudogap temperature $T^{\ast }$, pseudogap size ${\Delta }_{pg}$ and $<|{\Delta }_d(0){|}^2>$. In the present scenario for the pseudogap, the normal state pseudogap is caused by the induced local spin-singlet amplitude due to short-range spin correlations, which compete in the low energy sector with superconducting correlations to make $T_c$ go to zero near half-filling. Calculated $T^{\ast }$ falls from a high value onto the $T_c$ line and closely follows mean-field Néel temperature $T_N^{MF}$. The calculated ${\Delta }_{pg}$ is in good agreement with experimental results. We propose an experiment in which the present scenario can be critically tested.

5 pages, 3 figures

References in corpus (3)

• The doping dependence of T* - what is the real high-Tc phase diagram?
• Spectral properties and pseudogaps in a model with d-wave pairing symmetry
• Short-range spin correlations and induced local spin-singlet amplitude in the Hubbard model

Cited by in corpus (2)

• Pressure dependence of the oxygen isotope effect in YBa${}_2$Cu${}_4$O${}_8$
• Short-range spin correlations and pseudogap in underdoped cuprates