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arXiv 0907.2936cond-mat.mtrl-scicond-mat.str-el
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AEFe2As2(AE = Ba,Sr,Ca)单晶的各向异性热膨胀

Anisotropic thermal expansion of AEFe2As2 (AE = Ba, Sr, Ca) single crystals

Sergey L. Bud'ko, Ni Ni, Paul C. Canfield

摘要:

我们报告的各向异性热膨胀的母公司,AEFe 2As 2(AE = Ba,Sr和Ca),化合物。以上的结构/反铁磁相变的各向异性的热膨胀系数被观察到,与沿a轴的系数明显小于c轴的系数。对于所研究的化合物,高温(200 K < T < 300 K)系数本身具有相似的值。在热膨胀测量中可以清楚地看到与结构/反铁磁相变相关的尖锐异常。对于所有三种纯化合物的“平均”的a-值增加和c-晶格参数减少变暖通过过渡与观察到的SrFe 2As 2的晶格参数的最小变化。这些数据与X射线和中子衍射实验的文献数据基本一致。

英文摘要:

We report anisotropic thermal expansion of the parent, AEFe2As2 (AE = Ba, Sr, and Ca), compounds. Above the structural/antiferromagnetic phase transition anisotropy of the thermal expansion coefficients is observed, with the coefficient along the a-axis being significantly smaller than the coefficient for the c-axis. The high temperature (200 K < T < 300 K) coefficients themselves have similar values for the compounds studied. The sharp anomalies associated with the structural/antiferromagnetic phase transitions are clearly seen in the thermal expansion measurements. For all three pure compounds the "average" a-value increases and the c-lattice parameter decreases on warming through the transition with the smallest change in the lattice parameters observed for SrFe2As2. The data are in general agreement with the literature data from X-ray and neutron diffraction experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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