Nuclear spin relaxation rates in two-leg spin ladders

TL;DR

This paper investigates nuclear spin relaxation rates in two-leg spin ladders using the transfer-matrix DMRG method, highlighting the significant role of q_y=π contributions and comparing results with theory and experiments.

Contribution

It provides a detailed analysis of 1/T_1 in spin ladders, emphasizing the importance of q_y=π contributions and offering comparisons with existing theoretical and experimental data.

Findings

q_y=π contributions significantly affect relaxation rates

Results align with experimental measurements on ladder materials

The transfer-matrix DMRG method effectively models relaxation phenomena

Abstract

Using the transfer-matrix DMRG method, we study the nuclear spin relaxation rate 1/T_1 in the two-leg s=1/2 ladder as function of the inter-chain (J_{\perp}) and intra-chain (J_{|}) couplings. In particular, we separate the q_y=0 and \pi contributions and show that the later contribute significantly to the copper relaxation rate ^{63}(1/T_1) in the experimentally relevant coupling and temperature range. We compare our results to both theoretical predictions and experimental measures on ladder materials.