Transport properties in the strange-metal phase of high-Tccuprates: Spin-charge gauge theory versus experiments

Abstract

The SU(2)×U(1) Chern-Simons spin-charge gauge approach developed earlier to describe the transport properties of the cuprate superconductors in the "pseudogap" regime, in particular, the metal-insulator crossover of the in-plane resistivity, is generalized to the "strange metal" phase at higher temperature/doping. The short-range antiferromagnetic order and the gauge field fluctuations, which were the key ingredients in the theory for the pseudogap phase, also play an important role in the present case. The main difference between these two phases is caused by the existence of an underlying statistical π-flux lattice for charge carriers in the former case, whereas the background flux is absent in the latter case. The Fermi surface then changes from small "arcs" in the pseudogap to a rather large closed line in the strange metal phase. As a consequence the celebrated linear in T dependence of the in-plane and out-of-plane resistivity is explicitly derived. The doping concentration and temperature dependence of theoretically calculated in-plane and out-of-plane resistivity, spin-relaxation rate and AC conductivity are compared with experimental data, showing good agreement.

Gauge approach to the ‘pseudogap’ phenomenology of the spectral weight in highTccuprates

“…Combining (6.5) with Ioffe-Larkin rule one can show that the reduction of the spectral wight reducing temperature yields a deviation from below of the T -linear behaviour of in-plane resistivity, typical of the SM , as discussed in [30].…”

“…In both cases we use the numerical parameters adopted also in refs. [30] and [34], respectively. The broadening due to Γ(T, ω) strongly suppresses the contribution of the FL holon peak away from the diagonal of the BZ.…”

Spin-charge gauge symmetry: A way to tackle HTS cuprates?

“…Around a temperature T* (identifiable as the inflection point of the in-plane resistivity) the p-flux lattice of the charge gauge field melts and we enter the SM phase (at high d or T). In such a phase [10], holons have 'large' Fermi surface (3 F wt(1Kd)) and standard dispersion. The gauge fluctuations still induce the formation of a strongly overdamped magnon resonance, with inverse life-time wTQ 0 =ðcm 2 s Þ wT 4=3 and an 'electron resonance' with inverse life-time, G, of the same order and…”

Pulsed Laser-Induced Rapid Surface Cooling and Amorphization

“…Finally a Fourier transform is performed to get the retarded correlation function. Further approximations are needed however, especially in the treatment of short-scales, to get the final result; we refer the reader to (Marchetti et al 2004a(Marchetti et al , 2005 for details, but we briefly comment on some interesting features encountered in the calculation of, for example, the magnon correlation function.…”

“…For the last few years we have been developing a different gauge approach to attack the HTS problem, using a U (1) field to gauge the global charge symmetry and an SU (2) field to gauge the global spin symmetry (Marchetti et al 1998(Marchetti et al , 2000(Marchetti et al , 2001(Marchetti et al , 2004a(Marchetti et al , 2004b(Marchetti et al , 2005. Unlike the slave-boson approach, the charge degree of freedom in our approach is carried by a fermion, while the spin degree of freedom is represented by a boson.…”