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arXiv 2006.07798cond-mat.supr-concond-mat.mtrl-sci
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LaO1-xFxBiSSe的结构phase diagram:通过部分F取代抑制结构相变

Structural phase diagram of LaO1-xFxBiSSe: suppression of the structural phase transition by partial F substitutions

Kazuhisa Hoshi, Shunsuke Sakuragi, Takeshi Yajima, Yosuke Goto, Akira Miura, Chikako Moriyoshi, Yoshihiro Kuroiwa, Yoshikazu Mizuguchi

摘要:

我们研究了BiCH_2基化合物LaO_(1-x)F_xBiSS_e(x = 0,0.01,0.02,0.03和0.5)的低温晶体结构,在x = 0.5时观察到了反常的二重对称面内超导态各向异性。从同步辐射X射线衍射实验,观察到的结构转变从四斜晶系单斜晶系x = 0和0.01,在340和240 K,分别。当x = 0.03时,在100 K以下没有观察到结构转变和衍射峰的展宽。这些事实表明,在LaO_(1-x)F_xBiSSe中,3%的F取代可以抑制结构转变。此外,通过低温(实验室)X射线衍射检查在4K下x = 0.5的晶体结构,其证实了在4K下x = 0.5时保持四氢呋喃结构。我们的研究结果表明,观察到的LaO 0.5F 0.5BiSSe超导态的二重对称面内各向异性不是源于结构对称性降低。

英文摘要:

We have investigated low-temperature crystal structure of BiCh2-based compounds LaO1-xFxBiSSe (x = 0, 0.01, 0.02, 0.03, and 0.5), in which anomalous two-fold-symmetric in-plane anisotropy of superconducting states has been observed for x = 0.5. From synchrotron X-ray diffraction experiments, a structural transition from tetragonal to monoclinic was observed for x = 0 and 0.01 at 340 and 240 K, respectively. For x = 0.03, a structural transition and broadening of the diffraction peak were not observed down to 100 K. These facts suggest that the structural transition could be suppressed by 3% F substitution in LaO1-xFxBiSSe. Furthermore, the crystal structure for x = 0.5 at 4 K was examined by low-temperature (laboratory) X-ray diffraction, which confirmed that the tetragonal structure is maintained at 4 K for x = 0.5. Our results suggest that the two-fold-symmetric in-plane anisotropy of superconducting states observed for LaO0.5F0.5BiSSe was not originated from structural symmetry lowering.

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