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Piyawongwatthana, P.; 那波 和宏*; Wu, H. C.*; 佐藤 卓*
no journal, ,
Magnetic properties of Cu(MoO)(SeO) were investigated using magnetic susceptibility and neutron powder diffraction. This compound has an armchair chain structure along the -axis that is formed by two inequivalent Cu1 and Cu2 atoms. The magnetic susceptibility shows a broad peak at 50 K, followed by a phase transition into antiferromagnetically ordered states at = 23.6 K. Below , powder neutron diffraction reveals that the = 1/2 Cu spins order antiferromagnetically with the magnetic propagation vector = (0, 0, 0). The spin polarization is predominantly along the -axis with weak non-collinearity. This system was also found to be a magnetoelectric material. Further measurements of each component of the magnetoelectric tensor confirmed that it belongs to magnetic space group .
河村 聖子; 古府 麻衣子; 村井 直樹; 稲村 泰弘; 楡井 真実; Piyawongwatthana, P.; 若井 大介*; 中島 健次
no journal, ,
AMATERAS, a cold-neutron disk-chopper spectrometer at the Materials and Life Science Experimental Facility in J-PARC, has been in operation since 2009. Due to its high flexibility of the neutron flux and the energy resolution, AMATERAS has been used for experiments in various research fields such as magnetism, functional materials and so on. Recent issues of AMATERAS are the high competition rate in the user program, inefficiency of beamtime due to frequent changing of sample environment and resultant working loads of the staff. In order to improve such a situation, we have been upgrading the instrument for the past few years. Associated with refurbishment of the cryopump on the vacuum scattering chamber in 2020, we introduced a gate valve on it and automated the pumping system of the vacuum scattering chamber. Furthermore, we extended a short guide mirror downstream of the monochromating chopper by replacing a BC collimator with it. While we gained the neutron flux, it yields a new background at a low- region.