The temperature dependence of the local tunnelling conductance in cuprate superconductors with competing AF order

Abstract

Based on the $t-t^{\prime }-U-V$ model with proper chosen parameters for describing the cuprate superconductors, it is found that near the optimal doping at low temperature ($T$), only the pure d-wave superconductivity ($d$SC) prevails and the antiferromagnetic (AF) order is completely suppressed. At higher $T$, the AF order with stripe modulation and the accompanying charge order may emerge, and they could exist above the $d$SC transition temperature. We calculate the local differential tunnelling conductance (LDTC) from the local density of states (LDOS) and show that their energy variations are rather different from each other as $T$ increases. Although the calculated modulation periodicity in the LDTC/LDOS and bias energy dependence of the Fourier amplitude of LDTC in the "pseudogap" region are in good agreement with the recent STM experiment [Vershinin $etal.$, Science {\bf 303}, 1995 (2004)], we point out that some of the energy dependent features in the LDTC do not represent the intrinsic characteristics of the sample.

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Cited by in corpus (3)

• Competing orders and the doping and momentum dependent quasiparticle excitations in cuprate superconductors
• Macroscopic evidence for quantum criticality and field-induced quantum fluctuations in cuprate superconductors
• Proximity induced pseudogap in mesoscopic superconductor/normal-metal bilayers