What drives superconductivity in Pt-doped IrTe2

The emergency of superconductivity at the edge of charge density wave （CDW） state by pressure or chemical doping in 1T transi- tion metal dichalcogenides （TMDs） has attracted much attention in past decade [1, 2]. The interplay of CDW and superconduc- tivity has triggered the hot debate： why does sup...

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Published in中国科学通报：英文版 no. 8; p. 822
Main Author Kui Jin Kai Liu
Format Journal Article
LanguageEnglish
Published 2015
Subjects
CDW
上层建筑
层状化合物
扫描隧道显微镜
电荷密度波
超导体
金属碲化物
铂掺杂
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Summary:The emergency of superconductivity at the edge of charge density wave （CDW） state by pressure or chemical doping in 1T transi- tion metal dichalcogenides （TMDs） has attracted much attention in past decade [1, 2]. The interplay of CDW and superconduc- tivity has triggered the hot debate： why does superconductivity arise after suppressing the CDW and what＇s the driving force of the charge modulation？ For the 5d transition metal ditelluride IrTe2, a layered compound with trigonal symmetry, previous studies have shown an ordered superstructure below ～ 280 K, and a superconducting state when doped or intercalated with Pd or Pt [3, 4]. In IrTe2, the Fermi surface nesting has been excluded as the impetus of superstructure; instead, splitting of Te orbitals by the crystal field [5] or destabilization of polymeric Te-Te networks was proposed [6], evident from the visualized periodic dimer- ization of Te atoms by scanning tunneling microscopy （STM） [7]. Meanwhile, a charge disproportionated CDW by covalent bond- ing Ir dimers was also presented [8]. However, though the origin of the superstructure formation becomes more and more clear, the underlying mechanism of the appearance of superconductivity by doping Pd or Pt is still obscure.
Bibliography:11-1785/N
The emergency of superconductivity at the edge of charge density wave （CDW） state by pressure or chemical doping in 1T transi- tion metal dichalcogenides （TMDs） has attracted much attention in past decade [1, 2]. The interplay of CDW and superconduc- tivity has triggered the hot debate： why does superconductivity arise after suppressing the CDW and what＇s the driving force of the charge modulation？ For the 5d transition metal ditelluride IrTe2, a layered compound with trigonal symmetry, previous studies have shown an ordered superstructure below ～ 280 K, and a superconducting state when doped or intercalated with Pd or Pt [3, 4]. In IrTe2, the Fermi surface nesting has been excluded as the impetus of superstructure; instead, splitting of Te orbitals by the crystal field [5] or destabilization of polymeric Te-Te networks was proposed [6], evident from the visualized periodic dimer- ization of Te atoms by scanning tunneling microscopy （STM） [7]. Meanwhile, a charge disproportionated CDW by covalent bond- ing Ir dimers was also presented [8]. However, though the origin of the superstructure formation becomes more and more clear, the underlying mechanism of the appearance of superconductivity by doping Pd or Pt is still obscure.
Kui Jin , Kai Liu（1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2 Department of Physics, Renmin University of China, Beijing 100872, China）
ISSN:1001-6538
1861-9541