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Magnetic Property of a Single Crystal of Spin-1/2 Triple-chain Magnet Cu3(OH)4SO4
Yutaka Fujii,Yuya Ishikawa,Hikomitsu Kikuchi,Yasuo Narumi,Hiroyuki Nojiri,Shigeo Hara,Hirohiko Sato 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
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 performedspecific-heat measurements under magnetic fields up to 10 T and in the temperature range downto 1.9 K and proton nuclear magnetic resonance (1H-NMR) experiments with single crystals. Wefound at least three successive phase transitions at zero field around 5 K which strongly dependon 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 antiferromagneticcommensurate spin structure with at least four sublattices, which is discussed in connection withthe idle-spin state. Phase diagrams show a richness of magnetic phases for this compound.