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Control of chirality of transition-metal monosilicides by the Czochralski method

机译：直拉法控制过渡金属单硅化物的手性

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摘要

The crystallographic and magnetic chirality of the B20 (space group P2_13) solid solutions Fe_(1-x)Co_xSi and pure MnSi grown by the Czochralski method has been studied by means of the single crystal x-ray diffraction and the small-angle diffraction of polarized neutrons. To test the possibilities to control the crystal handedness, first, we have grown a series of MnSi crystals and one series of Fe_(1-x)Co_xSi samples with x = 0,0.10,0.15,0.20,0.25,0.30,0.50 using a right-handed crystal as a seed. Second, we have grown another series of MnSi and Fe_(1-x)Co_xSi samples again of different concentrations using a left-handed crystal as a seed. In 90% of the cases the grown sample has been found to be enantiopure and to inherit the crystallographic chirality of its seed crystal. In 10% of the cases undefined circumstances flip the chirality over for the next progeny or produce a racemic sample. The magnetic chirality of these compounds has been shown to be rigorously related to their crystallographic handedness, but in the opposite way for MnSi and for Fe_(1-x)Co_xSi.
机译：利用Czochralski方法生长的B20（空间群P2_13）Fe_（1-x）Co_xSi和纯MnSi固溶体的晶体学和磁手性已经通过单晶x射线衍射和小角度衍射研究了。极化中子。为了测试控制晶向性的可能性，首先，我们使用a生长了一系列MnSi晶体和一系列x = 0,0.10,0.15,0.20,0.25,0.30,0.50的Fe_（1-x）Co_xSi样品。右手晶作为种子。其次，我们使用左手晶体作为种子，再次生长了另一系列不同浓度的MnSi和Fe_（1-x）Co_xSi样品。在90％的情况下，已发现生长的样品是对映体纯的，并继承了其籽晶的晶体手性。在10％的情况下，不确定的情况将手性翻转给下一个后代或产生外消旋样品。已显示这些化合物的磁性手性与它们的晶体学手性密切相关，但对于MnSi和Fe_（1-x）Co_xSi则相反。

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  • 来源
    《Physical review》 |2011年第1期|p.014435.1-014435.5|共5页
  • 作者

    V. A. Dyadkin; S. V. Grigoriev; D. Menzel; D. Chemyshov; V. Dmitriev; J. Schoenes; S. V. Maleyev; E. V. Moskvin; H. Eckerlebe;

  • 作者单位

    Petersburg Nuclear Physics Institute, Gatchina, RU-188300 St. Petersburg, Russia;

    Petersburg Nuclear Physics Institute, Gatchina, RU-188300 St. Petersburg, Russia;

    Institutfur Physik der Kondensierten Materie, Technische Universitat Braunschweig, D-38106 Braunschweig, Germany;

    Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility, Grenoble F-38000, France;

    Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility, Grenoble F-38000, France;

    Institutfur Physik der Kondensierten Materie, Technische Universitat Braunschweig, D-38106 Braunschweig, Germany;

    Institutfur Physik der Kondensierten Materie, Technische Universitat Braunschweig, D-38106 Braunschweig, Germany;

    Petersburg Nuclear Physics Institute, Gatchina, RU-188300 St. Petersburg, Russia;

    Gesellschaft fur Kernenergieverwertung in Schiffbau und Schiffahrt Forschungszentrum, D-21502 Geesthacht, Germany;

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