Spin Dynamics in the LTT Phase of ~1/8 Doped Single Crystal La_{1.67}Eu_{0.2}Sr_{0.13}CuO_4

TL;DR

This study investigates spin dynamics in a La-based cuprate with stripe order, revealing slowing electronic spin fluctuations, anisotropic behavior, and an enhanced spin pseudogap linked to static charge order in the LTT phase.

Contribution

It provides detailed NMR relaxation measurements showing the influence of charge stripes on spin fluctuations and pseudogap behavior in the LTT phase of this cuprate.

Findings

Peak in La spin-lattice relaxation rate indicates slowing spin fluctuations.

Spin fluctuations exhibit XY-like anisotropy in the ordered state.

Charge order enhances the spin pseudogap.

Abstract

We present La and Cu NMR relaxation measurements in single crystal La_{1.67}Eu_{0.2}Sr_{0.13}CuO_4. A strong peak in the La spin-lattice relaxation rate observed in the spin ordered state is well-described by the BPP mechanism[1] and arises from continuous slowing of electronic spin fluctuations with decreasing temperature; these spin fluctuations exhibit XY-like anisotropy in the ordered state. The spin pseudogap is enhanced by the static charge-stripe order in the LTT phase.