Ground state of the spin-1/2 chain of green dioptase at high fields
Kazuki Matsui, Masashi Fujisawa, Kenta Hagiwara, Yukihiro Hoshino,, Takayuki Goto, Takahiko Sasaki, Hidekazu Tanaka, Susumu Okubo, Hitoshi, Ohta
TL;DR
This study investigates the high-field ground state of a spin-1/2 chain in dioptase, revealing a two-sublattice collinear structure that differs from the expected helical pattern, using NMR measurements.
Contribution
It provides new insights into the magnetic structure of dioptase under high fields, challenging previous assumptions about its helical spin chain configuration.
Findings
High-field state is a two-sublattice structure
Component within ab-plane is collinear
No match with helical spin chain pattern
Abstract
The gem-stone dioptase Cu6Si6O18.6H2O has a chiral crystal structure of equilateral triangular helices consisting of Cu-3d spins. It shows an antiferromagnetic order with an easy axis along c at TN = 15.5 K under zero field, and a magnetization jump at HC = 13.5 T when the field is applied along c-axis. By 29Si-NMR measurements, we have revealed that the high-field state is essentially the two sub-lattice structure, and that the component within ab-plane is collinear. The result indicates no apparent match with the geometrical pattern of helical spin chain.
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Taxonomy
TopicsMolecular spectroscopy and chirality · Photosynthetic Processes and Mechanisms · Spectroscopy and Quantum Chemical Studies