Collapsed tetragonal phase in Ca(Fe_(1-x)Co_x)_2As_2 stabilized by pressure:Structural studies using single-crystal neutron diffraction

K. Prokes; B. Ouladdiaf; L. Harnagea; S. Wurmehl; D. N. Argyriou; B. Biichner

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Collapsed tetragonal phase in Ca(Fe_(1-x)Co_x)_2As_2 stabilized by pressure:Structural studies using single-crystal neutron diffraction

机译：压力稳定的Ca（Fe_（1-x）Co_x）_2As_2中四方相的塌陷：单晶中子衍射的结构研究

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Ca(Fe_(1-x)Co_x)_2As_2 single crystals with concentration x = 0.032, 0.051, and 0.063 were investigated by means of neutron diffraction under hydrostatic pressure. The region of existence of the high-temperature tetragonal, low-temperature orthorhombic, and pressure-induced collapsed tetragonal phases have been determined and the corresponding p-T phase diagrams for the three compositions have been constructed. Structural details of the tetragonal phases at various conditions have been determined. The anomaly marking the orthorhombic-to-tetragonal structural phase transition temperature T_s decreases with increasing Co substitution. Similarly to that, the critical pressure of the tetragonal (or orthorhombic)-to-collapsed-tetragonal transition also decreases with increasing Co doping level. The behavior is highly hysteretic and the differences in critical pressures with increasing and decreasing branches eventually makes the collapsed tetragonal phase stable down to ambient pressure and enables structural studies under identical conditions. Within the error bars on the fourth digit, no modification of the As structural positional parameter is found. Such a result suggests that the change of the As-As bond is caused solely by the reduction of the c-axis lattice parameter.

机译：通过在静水压力下的中子衍射研究了浓度为x = 0.032、0.051和0.063的Ca（Fe_（1-x）Co_x）_2As_2单晶。确定了高温四方相，低温正交相和压力诱导的塌方四方相的存在区域，并绘制了三种成分的相应p-T相图。已经确定了在各种条件下四方相的结构细节。斜方晶向四方相变温度T_s的异常随着Co取代度的增加而减小。与此相似，四方（或正交）到坍塌的四方转变的临界压力也随着Co掺杂水平的提高而降低。该行为是高度滞后的，并且随着分支的增加和减少，临界压力的差异最终使塌陷的四方相稳定至环境压力，并能够在相同条件下进行结构研究。在第四个数字的误差条内，未发现As结构位置参数的修改。这样的结果表明，As-As键的变化仅由c轴晶格参数的降低引起。

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来源
《Physical review》 |2012年第10期|p.104523.1-104523.9|共9页
作者
K. Prokes; B. Ouladdiaf; L. Harnagea; S. Wurmehl; D. N. Argyriou; B. Biichner;
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Helmholtz-Zentrum Berlin fur Materialien und Energie, M-ll, Hahn-Meitner Platz I, 14109 Berlin, Germany;

Institut Laue-Langevin, 38042 Grenoble Cedex, France;

Leibniz-Institute for Solid State and Materials Research, (IFW)-Dresden, D-0117I Dresden, Germany;

Leibniz-Institute for Solid State and Materials Research, (IFW)-Dresden, D-0117I Dresden, Germany;

European Spoliation Source ESS AB-Box 176, 22100 Lund, Sweden;

Leibniz-Institute for Solid State and Materials Research, (IFW)-Dresden, D-0117I Dresden, Germany;

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crystallographic aspects of phase transformations; pressure; properties of type Ⅰand type Ⅱsuperconductors; intrinsic properties of magnetically ordered materials;

机译：相变的晶体学方面;压力;Ⅰ型和Ⅱ型超导体的性能;磁性有序材料的固有特性;

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Collapsed tetragonal phase in Ca(Fe_(1-x)Co_x)_2As_2 stabilized by pressure:Structural studies using single-crystal neutron diffraction

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