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High Field ESR Measurements on One Dimensional Antiferromagnetic Zigzag Chain Systems
Hitoshi Ohta,Susumu Okubo,Kousuke Shiraki,Makoto Yoshida,Alexei A. Belik,Masaki Azuma 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
In order to study the dynamical properties of the S = 1/2 one-dimensional zigzag chain anti-ferromagnet PbCuP2O7, we performed high field electron spin resonance (ESR) measurements of powder and magnetically aligned samples of PbCuP2O7 by using pulsed magnetic fields up to 15 T in the temperature range from 1.7 to 265 K. Dynamical properties, such as the increases in the g-value and the linewidth at low temperature, are observed. By the aid of a direct numerical ESR calculation, the observed g-shift can be understood only by assuming the Dzyaloshinski-Moriya interaction in the system. This is a new approach to determine the Dzyaloshinski-Moriya interaction in a S = 1/2 one-dimensional antiferromagnet.
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.