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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:10.03(Materials Science, Multidisciplinary)We report on the results of powder and single crystal neutron diffraction to investigate the magnetic order in YbCoSi
below the N
el 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 YbCo
Si
is in marked contrast to all other known
Co
Si
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:83.73(Materials Science, Multidisciplinary)YbCoSi
with the tetragonal ThCr
Si
-type structure is an isoelectronic compound to YbRh
Si
. At zero magnetic field YbCo
Si
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, YbCo
Si
is not only a good reference to YbRh
Si
but also an interesting system in its own to study its magnetic properties. In order to reveal the magnetic structure of YbCo
Si
, 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。YbCo
Si
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
Co
Si
(
=希土類)において観測される100, 001とは異なっており、YbCo
Si
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。