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Mufti, N.*; 金子 耕士; Hoser, A.*; Gutmann, M.*; Geibel, C.*; Krellner, C.*; Stockert, O.*
Physical Review B, 94(4), p.045116_1 - 045116_8, 2016/07
被引用回数:2 パーセンタイル:10.64(Materials Science, Multidisciplinary)We report on the results of powder and single crystal neutron diffraction to investigate the magnetic order in YbCoSi below the Nel temperature ,K in detail. Two different magnetically ordered phases can clearly be distinguished. At lowest temperatures a commensurate magnetic structure with a propagation vector is found, while the intermediate phase (,K) is characterized by an incommensurate magnetic structure with . The magnetic structure in YbCoSi is in marked contrast to all other known CoSi compounds ( = rare earth element) likely due to some itineracy of the Yb 4f states being responsible for the magnetism.
金子 耕士; Stockert, O.*; Mufti, N.*; Kiefer, K.*; Klingner, C.*; Krellner, C.*; Geibel, C.*; Steglich, F.*
Journal of Physics; Conference Series, 200, p.032031_1 - 032031_4, 2010/02
被引用回数:5 パーセンタイル:84.49(Materials Science, Multidisciplinary)YbCoSi with the tetragonal ThCrSi-type structure is an isoelectronic compound to YbRhSi. At zero magnetic field YbCoSi undergoes two magnetic transitions at =0.9,K and =1.7,K,and exhibits a complex magnetic phase diagram for small applied fields, lower than =2,T. Therefore, YbCoSi is not only a good reference to YbRhSi but also an interesting system in its own to study its magnetic properties. In order to reveal the magnetic structure of YbCoSi, a neutron powder diffraction experiment was carried out. At zero field, several superlattice reflections were clearly observed at 0.5,K. By heating up to 1.1,K, to the intermediate phase, a substantial change in both, the peak position and the intensity ratio of the magnetic reflection was found. We will propose a possible magnetic structure for both phases.
金子 耕士; Stockert, O.*; Mufti, N.*; Kiefer, K.*; Klingner, C.*; Krellner, C.*; Geibel, C.*; Steglich, F.*
no journal, ,
YbCoSiは、=0.9K, =1.7Kの2段の磁気転移を示すことが明らかとなった。また2T以下の低磁場で多段の磁気転移を示す、複雑な磁気相図が報告された。YbCoSiの磁気構造の決定とともに、この系の磁気相互作用を明らかにする目的で、中性子回折実験を行った。実験は、ベルリンのBER-II原子炉に設置されたE2において行った。粉末中性子回折パターンから、常磁性状態(2.0K)の結果を差し引いたものにおいて、明瞭な磁気反射の観測に成功した。0.48Kで観測された磁気反射は、1.1Kへの昇温に伴い、低角側にシフトするとともに、その強度比が大きく変化することを見いだした。今回観測された磁気反射は、磁気秩序を示す他のCoSi(=希土類)において観測される100, 001とは異なっており、YbCoSiの磁気秩序相は、単純な整合反強磁性構造ではないことを示している。当日は単結晶の結果と合わせて、その磁気構造について報告する。