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Hikomitsu Kikuchi,Nguyen Thi Tinh Y,Yutaka Fujii,Akira Matsuo,Koichi Kindo 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Orthorombic Cu5(PO4)3(OH)4 (pseudomalachite) is a layered compound. Each Cu-O layer in thiscompound is separated by PO4 tetrahedra. The spin network in the bc-plane of a pseudomlachite iscomposed of triangles and pentagons, which will induce the spin frustration effect. This network maybe a new type of geometrically frustrated spin lattice. Magnetic susceptibility, specific heat, highfield magnetization measurements are used to study the magnetic properties of Cu5(PO4)3(OH)4 innatural mineral samples. Magnetic ordering is observed at around 4.2 K. The spin entropy changeat the transition temperature is about one-fifth times smaller than that expected for a usual longrangeorder. A 1/5 magnetization plateau is observed in the high-field magnetization curve. Theplateau is explained based on a simple model in which the spin network is assumed to be composedof chain, dimer and monomer units.
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.
Nonmagnetic Impurity Effect of the S = 1/2 Spin Ladder System (pipdH)2Cu1−xZnxBr4
Chiori Yokoyama,Eiichi Matsuoka,Hitoshi Sugawara,Takahiro Sakurai,Weimin Zhang,Susumu Okubo,Hitoshi Ohta,Hikomitsu Kikuchi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the synthesis and the magnetic susceptibility of (pipdH)2Cu1−xZnxBr4(pipd=piperidinium), which is a nonmagnetic impurity-doped S = 1/2 spin ladder system. The sampleswere synthesized from a solution by using a slow evaporation method. Samples were confirmedto be in a single phase and to have the same crystal structure as the pure system (pipdH)2CuBr4by using X-ray diffraction measurements. To check the magnetic properties, we performed magneticsusceptibility and magnetization measurements with a superconducting quantum interferencedevice magnetometer. A plot of the inverse magnetic susceptibility indicates the presence of dominantantiferromagnetic coupling. The magnetic susceptibility shows a broad maximum due to lowdimensionality and a spin gap behavior related to the two-leg spin ladder at low temperature. Thespin gap and the Curie constants of Zn-doped samples, as estimated from an analysis of themagnetic susceptibility, monotonically decrease as the Zn concentration decreases. A nonmagneticimpurity of S = 1/2 spin ladder system affects the spin gap.