Abstract
The origin of the weak insulating behavior of the resistivity, i.e. {rho }_{xx}propto {mathrm{ln}},(1/T), revealed when magnetic fields (H) suppress superconductivity in underdoped cuprates has been a longtime mystery. Surprisingly, the high-field behavior of the resistivity observed recently in charge- and spin-stripe-ordered La-214 cuprates suggests a metallic, as opposed to insulating, high-field normal state. Here we report the vanishing of the Hall coefficient in this field-revealed normal state for all T < (2-6){T}_{{rm{c}}}^{0}, where {T}_{{rm{c}}}^{0} is the zero-field superconducting transition temperature. Our measurements demonstrate that this is a robust fundamental property of the normal state of cuprates with intertwined orders, exhibited in the previously unexplored regime of T and H. The behavior of the high-field Hall coefficient is fundamentally different from that in other cuprates such as YBa2Cu3O6+x and YBa2Cu4O8, and may imply an approximate particle-hole symmetry that is unique to stripe-ordered cuprates. Our results highlight the important role of the competing orders in determining the normal state of cuprates.
Highlights
The origin of the weak insulating behavior of the resistivity, i.e. ρxx / ln ð1=TÞ, revealed when magnetic fields (H) suppress superconductivity in underdoped cuprates has been a longtime mystery
CuO2 plane, charge order appears in the form of static stripes that are separated by charge-poor regions of oppositely phased antiferromagnetism[2], i.e. spin stripes, stripes are rotated with the onset by 90∘ from one temperatures
Further insight is obtained by comparing the Hall results with the phase diagram obtained by other transport techniques, as shown in Fig. 1c, d
Summary
The origin of the weak insulating behavior of the resistivity, i.e. ρxx / ln ð1=TÞ, revealed when magnetic fields (H) suppress superconductivity in underdoped cuprates has been a longtime mystery. Magnetic fields have been commonly used to suppress superconductivity and expose the properties of the normal state, but the nature of the high-H normal state may be further complicated by the interplay of charge and spin orders with superconductivity. La2−x−ySrx(Nd,Eu)yCuO4 compounds are ideal candidates for probing the nature of the field-revealed ground state[1] of underdoped cuprates in the presence of intertwined orders because, for doping levels near x = 1/8, they exhibit both spin and charge orders with the strongest correlations and lowest. The low values of pTh0c ahseavdeiamgraadme[3] it possible using both to determine the in-plane T–H vortex linear and nonlinear transport over the relatively largest range of T and perpendicular H (i.e., H⊥ CuO2 layers), and to probe deep into the high-field normal state. It turns out that a wide regime of vortex liquid-like behavior, i.e
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