Field-induced log(1/T) diverging resistivity deviation from normal state in superconducting cuprates

Abstract

Resistivity measurements were performed on single crystals of the superconducting cuprates (Nd, Ce) 2 CuO 4 (NCCO) at zero and high magnetic fields. By suppressing the superconducting phase, the well-known log(1/T ) diverging resistivity was observed at low temperature. Surprisingly, for samples with an insulator-like upturn of resistivity in the normal state at zero field, the diverging resistivity induced by high field in the superconducting region clearly deviates from the insulator-like behaviour in the normal state at a certain temperature (deviating temperature). The results indicate that the field-induced resistivity has a different nature from that of the normal state. Antiferromagnetic order is considered to play a crucial role in the occurrence of the log(1/T ) resistivity.

Transport properties and magnetic-field-induced localization in the misfit cobaltite [Bi2Ba1.3K0.6Co0.1O4]RS[CoO2]1.97single crystal

“…In cuprates, field-induced SDW state has been taken as one of the points of view to interpret the logarithmically temperature-dependent resistivity. [28,29,30] In most misfit-layered triangular cobaltitles, such as Ca 3 Co 4 O 9 , (Bi,Pb) 2 M 2 Co 2 O y (M =Ca and Sr), SDW is a common spin ordered state. [10] Determining from the µSR results, however, no SDW exists down to 1.8 K at zero or low field in updoped Bi 2 Ba 2 Co 2 O y , [10] Another point of view is the weak localization in 2D systems, [31,32] which theoretically predicts a logarithmic temperature dependence of the conductivity.…”

“…There are two main points of view to interpret such logarithmic resistivity. In cuprates, the fieldinduced SDW state has been taken as one of the points of view to interpret the logarithmically temperature-dependent resistivity [27][28][29]. In most misfit-layered triangular cobaltites, such as Ca 3 Co 4 O 9 , (Bi, Pb) 2 M 2 Co 2 O y (M = Ca and Sr), the SDW is a common spin ordered state [10].…”

Superconductivity, Hall properties and disorder effect in Pr1−xCaxBa2Cu3O7−δ(0.4≤x≤0.6) epitaxial thin films

“…However, we also note that Coulomb interaction in conventional metals can also lead to a ln T scaling [28]. For cuprates such as (Nd, Ce) 2 CuO 4 , AF order in CuO 2 planes may also give rise to an analogous diverging resistivity behavior [32]. Therefore, a simple attribution of the negative TCR behavior to the 2D weak localization mechanism may be not strictly correct.…”