Incommensurate Spin Dynamics in High Temperature Superconductor of Optimally Doped YBa2Cu3O7

TL;DR

This study investigates the spin dynamics in optimally doped YBa2Cu3O7 using neutron scattering, revealing incommensurate spin modulation and a potential universal relationship with superconducting transition temperature.

Contribution

It demonstrates the presence of incommensurate spin modulation in optimally doped YBa2Cu3O7 and proposes a linear relation between incommensurability and Tc, suggesting a universal feature of high-Tc superconductors.

Findings

Incommensurate spin modulation observed in optimally doped YBa2Cu3O7.

Linear relationship between incommensurability and Tc.

Similar incommensurability found in under-doped La2-ySryCuO4.

Abstract

The spin dynamics of an optimally doped YBa2Cu3O7 (Tc = 93 K) crystal array have been investigated in a wide range of momentum and energy (Q - E) space using the time-of-flight neutron scattering method. Incommensurate spin modulation in Q is a characteristic feature, as it is in the under-doped YBa2Cu3O6.7 with a different incommensurability. A linear relationship between the incommensurability and Tc is proposed. Along with the discovery of the same incommensurability in under-doped La2-ySryCuO4, it may be a generic characteristic of the high-Tc oxide superconductor.