High-Field Heat Capacity of Atacamite Cu2Cl(OH)3 for H ∥ b axis: From Antiferromagnetic Order to Correlated Disorder
Abstract
We present the heat capacity of the frustrated sawtooth-chain compound atacamite Cu2Cl(OH)3 in high magnetic fields up to 35 T for H ∥ b axis. We clearly observe the change from antiferromagnetic long-range order, indicated by a sharp transition anomaly shifted to lower temperatures when increasing field, to a field-induced spin-liquid-like state with the absence of any transition anomaly. Here, in highest magnetic fields above 32 T a broad anomaly is present which is shifted to higher temperatures as the field is increased. The low-temperature heat capacity in the high-field region can be described well by an exponential behavior indicating a thermal activation over a spin gap. The findings are consistent with our scenario for the high-field state in atacamite for H ∥ c axis, where we proposed the sawtooth chains to decouple into two spin subsystems, basal and apical spin sites, leading to a partially polarized state with M ∼ Msat/2.
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BibTeX
@misc{stodter2026highfield,
title = {{High-Field Heat Capacity of Atacamite Cu$_2$Cl(OH)$_3$ for $\mathbfH \parallel b$ axis: From Antiferromagnetic Order to Correlated Disorder}},
author = {L. Stödter and A. Demuer and T. Kotte and A. U. B. Wolter and B. Büchner and K. C. Rule and S. Süllow},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.39669},
eprint = {2610.39669},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.39669},
}
RIS
TY - UNPB
TI - High-Field Heat Capacity of Atacamite Cu_2Cl(OH)_3 for H ∥ b axis: From Antiferromagnetic Order to Correlated Disorder
AU - L. Stödter
AU - A. Demuer
AU - T. Kotte
AU - A. U. B. Wolter
AU - B. Büchner
AU - K. C. Rule
AU - S. Süllow
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.39669
UR - https://arxiv.org/abs/2610.39669
AB - We present the heat capacity of the frustrated sawtooth-chain compound atacamite Cu_2Cl(OH)_3 in high magnetic fields up to 35 T for H ∥ b axis. We clearly observe the change from antiferromagnetic long-range order, indicated by a sharp transition anomaly shifted to lower temperatures when increasing field, to a field-induced spin-liquid-like state with the absence of any transition anomaly. Here, in highest magnetic fields above 32 T a broad anomaly is present which is shifted to higher temperatures as the field is increased. The low-temperature heat capacity in the high-field region can be described well by an exponential behavior indicating a thermal activation over a spin gap. The findings are consistent with our scenario for the high-field state in atacamite for H ∥ c axis, where we proposed the sawtooth chains to decouple into two spin subsystems, basal and apical spin sites, leading to a partially polarized state with M ∼ M_sat/2.
ER -