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arXiv · 2201.04857

Anomalously field-susceptible spin soft-matter emerging in an electric-dipole liquid candidate

Mizuki Urai·Kazuya Miyagawa·Yuta Watanabe·Elena I. Zhilyaeva·Svetlana A. Torunova·Rimma N. Lyubovskaya·Natalia Drichko·Kazushi Kanoda
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Abstract

Mutual interactions in many-body systems bring about a variety of exotic phases, among which liquid-like states failing to order due to frustration are of keen interest. Recently, an organic system with an anisotropic triangular lattice of molecular dimers has been suggested to host a dipole liquid arising from intradimer charge-imbalance instability, possibly offering an unprecedented stage for the spin degrees of freedom. Here we show that an extraordinary unordered(unfrozen) spin state having soft-matter-like spatiotemporal characteristics is substantiated in this system. $^1$H NMR spectra and magnetization measurements indicate that gigantic, staggered moments are non-linearly and inhomogeneously induced by magnetic field whereas the moments vanish in the zero-field limit. The analysis of the NMR relaxation rate signifies that the moments fluctuate at a characteristic frequency slowing down to below MHz at low temperatures. The inhomogeneity, local correlation, and slow dynamics indicative of middle-scale dynamical correlation length suggest a novel frustration-driven spin clusterization.

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Mizuki Urai, Kazuya Miyagawa, Yuta Watanabe, Elena I. Zhilyaeva, Svetlana A. Torunova, Rimma N. Lyubovskaya, Natalia Drichko, Kazushi Kanoda. 2022-01-13. Anomalously field-susceptible spin soft-matter emerging in an electric-dipole liquid candidate. https://doi.org/10.1126/sciadv.abn1680

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