Similarity between Ni and Zn impurity effects on the superconductivity and Cu-spin correlation in La2-xSrxCu1-yNiyO4 high-Tc cuprates: A comparison based on the hole trapping by Ni

TL;DR

This study compares Ni and Zn impurity effects on superconductivity and Cu-spin correlations in La2-xSrxCu1-yNiyO4, revealing that Ni with trapped holes mimics Zn's impact by inducing hole localization and enhancing spin correlations.

Contribution

It demonstrates that Ni with hole trapping affects superconductivity and spin correlations similarly to Zn, providing insight into impurity effects in high-Tc cuprates.

Findings

Ni suppresses superconductivity and localizes holes.

Ni induces Cu-spin correlations comparable to Zn.

Hole trapping by Ni influences impurity scattering in CuO2 planes.

Abstract

Ni-substitution effects on the superconductivity and Cu-spin correlation have been investigated in La2-xSrxCu1-yNiyO4 from the electrical resistivity and muon spin relaxation measurements, taking into account the hole trapping by Ni recently suggested. It has been found that the Ni-substitution suppresses the superconductivity, induces the localization of holes and develops the Cu-spin correlation to the same degree as the Zn substitution. These suggest that Ni with a trapped hole tends to give rise to potential scattering of holes in the CuO2 plane to the same degree as Zn, being discussed in relation to the so-called dynamical stripe correlations of spins and holes.