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Magnetic Anisotropy of Tetragonal Rare-earth Compounds RRu2Al2B (R: Rare-earth Metals)
Eiichi Matsuoka,Yo Tomiyama,Kotaro Iwasawa,Hitoshi Sugawara,Takahiro Sakurai,Hitoshi Ohta 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Recently, a new tetragonal compound CeRu2Al2B, which shows successive magnetic transitionsof antiferromagnetic and ferromagnetic orders was discovered. In this paper, the results of magnetizationmeasurements on magnetically-aligned powder sample of CeRu2Al2B were reported. Highly-anisotropic behaviors between the magnetizations along the easy and the hard directionswere observed. The anisotropic behavior of the magnetizations could be explained qualitativelyby considering the crystalline-electric-field scheme with the
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.
High-pressure Studies of DyB2C2
Hiroki Yamauchi,Toyotaka Osakabe,Masashi Kosaka,Eiichi Matsuoka,Hideya Onodera 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We performed single-crystal neutron diffraction experiments and electrical resistivity measurementsunder high pressure on DyB2C2 showing both the antiferroquadrupolar (AFQ) and antiferromagnetic(AFM) orders. The N´eel temperature TN increases gradually with increasing pressure andsaturates at pressures above 5.2 GPa while the AFQ transition temperature TQ decreases almostmonotonically up to 3.13 GPa and seems to merge with TN at around 6 – 7 GPa. These resultsindicate that the application of pressure suppresses the AFQ ordering in DyB2C2 and simultaneouslyenhances the AFM interaction between 4f spins. The suppression of the AFQ ordering canbe interpreted as being due to the restriction of the local strain associated with the AFQ transitioncaused by applying pressure.