Dynamic Superconductivity Responses in Photo-excited Optical Conductivity and Nernst Effect

Abstract

High-Tc cuprate, A3C60 and other unconventional superconductors (SCs) have very high Tc with respect to the energy scale of superconducting (SC) charges inferred from the superfluid density (SFD). The observed linear dependence of Tc on the SFD can hardly be expected in BCS SCs while being reminiscent of Bose Einstein Condensation of pre-formed pairs. As additional non-BCS like behaviors, responses similar to those in the bulk SC states have been observed at temperatures (T) well above Tc in the vortex-like Nernst effect, diamagnetic susceptibility, and transient optical conductivity in photo-excitation (PEX) measurements. Here we propose a picture based on equilibrium and transient SFD to understand these unconventional behaviors. This picture assumes: (1) Dynamic SC responses in the Nernst and PEX measurements emerge at the formation of the local phase coherence (LPC) among wave functions of pre-formed pairs. (2) Its onset T (TLPC) is distinct from and lower than the pair-formation pseudo-gap T (Tstr). (3) The bulk SC Tc is reduced from TLPC, due to the competition between the SC and antiferromagnetic (AF) order. (4) The magnetic resonance mode (MRM) controls Tc in the SC-AF competition. (5) The transient optical responses can be attributed to a change of the balance between the competing SC and AF orders caused by PEX. The assumptions (1) and (2) explain the relationship between Tc and the transient SFD in PEX studies and equilibrium SFD in Nernst effect. (3) and (4) are inferred from the linear dependence of Tc on the MRM energy. (4) and (5) are consistent with the behaviors of the 400 cm-1 optical mode in equilibrium and PEX studies, whose intensity represents the MRM intensity. Unlike previous phase-fluctuation pictures which expect dynamic responses between Tstr and Tc, the present picture involving competing order indicates that dynamic SC responses are seen between TLPC and Tc.

arXiv comment22 pages, 4 figures. Original regular article

References in corpus (37)

• The pseudogap in high-temperature superconductors: an experimental survey
• An optically stimulated superconducting-like phase in K3C60 far above equilibrium Tc
• The Nernst effect in high-$T_c$ superconductors
• Broken rotational symmetry in the pseudogap phase of a high-Tc superconductor
• Optically enhanced coherent transport in YBa2Cu3O6.5 by ultrafast redistribution of interlayer coupling
• Diamagnetism and Cooper pairing above $T_c$ in cuprates
• Magnetism in Fe-based superconductors
• Field-enhanced diamagnetism in intense magnetic field in the pseudogap state of the cuprate $\rm Bi_2Sr_2CaCu_2O_{8+δ}
• Transient superconductivity from electronic squeezing of optically pumped phonons
• The connection between superconducting phase correlations and spin excitations in YBa${}_2$Cu${}_3$O${}_{6.6}$: A magnetic field study
• Dynamical Cooper pairing in non-equilibrium electron-phonon systems
• Universal relation between magnetic resonance and superconducting gap in unconventional superconductors
• Low-Energy Electronic Structure of the High-Tc Cuprates La2-xSrxCuO4 Studied by Angle-resolved Photoemission Spectroscopy
• Evidence of precursor superconductivity as high as 180 K from infrared spectroscopy
• Anisotropic superconducting properties of single-crystalline FeSe0.5Te0.5
• Pseudogap temperature $T^{\star }$ of cuprate superconductors from the Nernst effect
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Transverse optical plasmons in layered superconductors
• Pressure tuning of light-induced superconductivity in K3C60
• Condensation, excitation, pairing, and superfluid density in high-$T_c$ superconductors: magnetic resonance mode as a roton analogue and a possible spin-mediated pairing
• Superconductivity: Exotic Commonalities in Phase and Mode
• Colossal thermomagnetic response in the exotic superconductor URu2Si2
• Vorticity and the Nernst Effect in Cuprate Superconductors
• Non-equilibrium superconductivity in driven alkali-doped fullerides
• Transverse optical Josephson plasmons, equations of motion
• Wavelength dependent optical enhancement of superconducting interlayer coupling in La1.885Ba0.115CuO4
• Two distinct kinetic regimes for the relaxation of light-induced superconductivity in La${}_{1.675}$Eu${}_{0.2}$Sr${}_{0.125}$CuO${}_4$
• Nernst effect in the cuprate superconductor YBCO: Broken rotational and translational symmetries
• Dynamical decoherence of the light induced interlayer coupling in YBa${}_2$Cu${}_3$O${}_{6+\delta }$
• Transient superconductivity without superconductivity
• Energy-scale phenomenology and pairing via resonant spin-charge motion in FeAs, CuO, heavy-fermion and other exotic superconductors
• Restoring Interlayer Josephson Coupling in La_{1.885}Ba_{0.115}CuO_4 by Charge Transfer Melting of Stripe Order
• The role of magnetism in forming the c-axis spectral peak at 400 cm-1 in high-temperature superconductors
• Giant Nernst and Hall Effects in Chiral Superconductors due to Berry Phase Fluctuations
• Magnetization of underdoped YBa${}_2$Cu${}_3$O${}_y$ above the irreversibility field
• Optical melting of the transverse Josephson plasmon: a comparison between bilayer and trilayer cuprates
• From Friedel oscillations and Kondo effect to the pseudogap in cuprates

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