We perform a comparative study of the KCr3As3 and the K2Cr3As3 quasi 1D compounds, and show that the strong interplay between the lattice and the spin degrees of freedom promotes a new collinear ferrimagnetic ground state within the chains in presence of intrachain antiferromagnetic couplings. We propose that the interchain antiferromagnetic coupling in KCr3As3 plays a crucial role for the experimentally observed spin-glass phase with low critical temperature. In the same region of the parameter space, we predict K2Cr3As3 to be non-magnetic but on the verge of the magnetism, sustaining interchain ferromagnetic spin fluctuations while the intrachain spin fluctuations are antiferromagnetic.
@article{arxiv.2007.06337,
title = {Intra-chain collinear magnetism and inter-chain magnetic phases in Cr3As3-K-based materials},
author = {Giuseppe Cuono and Filomena Forte and Alfonso Romano and Xing Ming and Jianlin Luo and Carmine Autieri and Canio Noce},
journal= {arXiv preprint arXiv:2007.06337},
year = {2021}
}