The spin-1/2 triple-chain magnet Cu3(OH)4SO4 (mineral name: antlerite) is a candidate ‘idlespin’ system. In order to study the phase transitions in this compound in detail, we have performed specific-heat measurements under magnetic fields up to 10 T and in the temperature range down to 1.9 K and proton nuclear magnetic resonance (1H-NMR) experiments with single crystals. We found at least three successive phase transitions at zero field around 5 K which strongly depend on the value and the direction of the applied field. Another transition around 3 K was also found. 1H-NMR spectra in a low-temperature and low-field ordered phase indicated an antiferromagnetic commensurate spin structure with at least four sublattices, which is discussed in connection with the idle-spin state. Phase diagrams show a richness of magnetic phases for this compound.
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Fujii, Y., Ishikawa, Y., Kikuchi, H. et al. Magnetic property of a single crystal of spin-1/2 triple-chain magnet Cu3(OH)4SO4 . Journal of the Korean Physical Society 62, 2054–2058 (2013). https://doi.org/10.3938/jkps.62.2054
- Spin-1/2 triple chain magnet
- Single crystal
- Cu3(OH) 4SO4
- Idle spin
- Specific heat
- Successive magnetic phase transition