Magnetic field effect on Fe-induced short-range magnetic correlation and electrical conductivity in Bi$_{1.75}$Pb$_{0.35}$Sr$_{1.90}$Cu$_{0.91}$Fe$_{0.09}$O$_{6+y}$

TL;DR

This study investigates how magnetic fields influence short-range magnetic correlations and electrical resistivity in overdoped Fe-doped cuprate, revealing a negative magnetoresistive effect and suppression of magnetic correlations, supporting a Kondo-like behavior.

Contribution

It provides new insights into the magnetic and electronic effects of Fe doping in overdoped cuprates under magnetic fields, favoring a Kondo model over stripe order.

Findings

Magnetic fields reduce resistivity below magnetic correlation onset.

Fe doping induces short-range incommensurate magnetic correlations.

Resistivity exhibits a ln(1/T) upturn at low temperatures.

Abstract

We report electrical resistivity measurements and neutron diffraction studies under magnetic fields of Bi$_{1.75}$Pb$_{0.35}$Sr$_{1.90}$Cu$_{0.91}$Fe$_{0.09}$O$_{6+y}$, in which hole carriers are overdoped. This compound shows short-range incommensurate magnetic correlation with incommensurability $\delta=0.21$, whereas a Fe-free compound shows no magnetic correlation. Resistivity shows an up turn at low temperature in the form of $ln(1/T)$ and shows no superconductivity. We observe reduction of resistivity by applying magnetic fields (i.e., a negative magnetoresistive effect) at temperatures below the onset of short-range magnetic correlation. Application of magnetic fields also suppresses the Fe induced incommensurate magnetic correlation. We compare and contrast these observations with two different models: 1) stripe order, and 2) dilute magnetic moments in a metallic alloy, with associated Kondo behavior. The latter picture appears to be more relevant to the present results.