Evidence of magnetically driven structural phase transition in RFeAsO (R=La, Sm, Gd, and Tb): A low-temperature x-ray diffraction study
نویسندگان
چکیده
Yongkang Luo,1 Qian Tao,1 Yuke Li,1 Xiao Lin,1 Linjun Li,1 Guanghan Cao,1 Zhu-an Xu,1,* Yun Xue,2 Hiroshi Kaneko,2 Andrey V. Savinkov,2 Haruhiko Suzuki,2 Chen Fang,3 and Jiangping Hu3 1Department of Physics, Zhejiang University, Hangzhou 310027, China 2Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan 3Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA Received 30 August 2009; revised manuscript received 14 November 2009; published 15 December 2009
منابع مشابه
Structural phase transition and superlattice misfit strain of RFeAsO (R=La,╇Pr,╇Nd,╇Sm)
The tetragonal-to-orthorhombic structural phase transition (SPT) in LaFeAsO (La-1111) and SmFeAsO (Sm-1111) single crystals measured by high-resolution x-ray diffraction is found to be sharp while the RFeAsO (R=La, Nd, Pr, Sm) polycrystalline samples show a broad continuous SPT. Comparing the polycrystalline and the single-crystal 1111 samples, the critical exponents of the SPT are found to be ...
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