Why T-linear resistivity persists across the overdoped cuprate range · revision history
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Accepted · first revision · record
- Title
- Why T-linear resistivity persists across the overdoped cuprate range
- Plain
- A zero-temperature phase transition should affect a metal most strongly at a single value of the tuning parameter, yet in overdoped cuprates a part of the resistance stays linear in temperature over a wide range of doping.
- Precise
- In overdoped La2-xSrxCuO4, Tl2Ba2CuO6+d and Bi2Sr2CuO6+d with superconductivity suppressed by field, $\rho(T) = \rho_0 + A_1 T + A_2 T^{2}$ with $A_1$ nonzero from $p$* to near the end of the superconducting dome, decreasing with p and correlated with $T_c$ (Cooper et al., Science 2009). Determine whether this reflects an extended critical phase, spatial inhomogeneity mixing Fermi-liquid and critical regions, or a single critical point with a broad crossover. An answer is a model that reproduces $A_1(p)$, the $A_1\ \text{versus}\ T_c$ correlation, the magnetoresistance and the reduced Hall carrier density of the overdoped strange metal (Putzke et al., Nature Physics 2021).
- Settled by
- Spatially resolved probes (NMR linewidths, scanning noise or nano-imaging) testing inhomogeneity on the same overdoped crystals, combined with a model fitted to $A_1(p)$, Hall and magnetoresistance data in two families.
- Kind
- phenomenon
- Answer type
- mechanism
- References
- (empty)
- Literature status
- open
- Status note
- Magnetotransport across the overdoped range (Ayres et al., Nature 2021) was described by an incoherent T-linear channel coexisting with conventional carriers; the origin of that channel is unexplained.
- Posed since
- 2009