Magnetic property of a single crystal of spin-1/2 triple-chain magnet Cu-3(OH)(4)SO4

作者：Fujii Yutaka^*; Ishikawa Yuya; Kikuchi Hikomitsu; Narumi Yasuo; Nojiri Hiroyuki; Hara Shigeo; Sato Hirohiko

来源：Journal of the Korean Physical Society, 2013, 62(12): 2054-2058.

DOI：10.3938/jkps.62.2054

• Spin-1/2 triple chain magnet
• Single crystal
• Cu-3(OH)(4)SO4
• Idle spin
• Specific heat
• NMR
• Successive magnetic phase transition

The spin-1/2 triple-chain magnet Cu-3(OH)(4)SO4 (mineral name: antlerite) is a candidate %26apos;idlespin%26apos; 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 (H-1-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. H-1-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.

• 出版日期2013-7