Break of symmetry at the surface of IrTe2 upon phase transition measured by x-ray photoelectron diffraction

被引:1
作者
Rumo, Maxime [1 ,2 ]
Pulkkinen, Aki [1 ,2 ,3 ]
Ma, KeYuan [4 ]
von Rohr, Fabian O. [4 ]
Muntwiler, Matthias [5 ]
Monney, Claude [1 ,2 ]
机构
[1] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland
[2] Univ Fribourg, Fribourg Ctr Nanomat, CH-1700 Fribourg, Switzerland
[3] LUT Univ, Sch Engn Sci, FI-53850 Lappeenranta, Finland
[4] Univ Zurich, Dept Chem, CH-8057 Zurich, Switzerland
[5] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
基金
瑞士国家科学基金会;
关键词
phase transition; x-ray photoelectron diffraction; local real space;
D O I
10.1088/1361-648X/ac3a45
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
IrTe2 undergoes a series of charge-ordered phase transitions below room temperature that are characterized by the formation of stripes of Ir dimers of different periodicities. Full hemispherical x-ray photoelectron diffraction (XPD) experiments have been performed to investigate the atomic position changes undergone near the surface of 1T-IrTe2 in the first-order phase transition, from the (1 x 1) phase to the (5 x 1) phase. Comparison between experiment and simulation allows us to identify the consequence of the dimerization on the Ir atoms local environment. We report that XPD permits to unveil the break of symmetry of IrTe2 trigonal to a monoclinic unit cell and confirm the occurrence of the (5 x 1) reconstruction within the first few layers below the surface with a staircase-like stacking of dimers.
引用
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页数:10
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