Open AccessMicroscopic Study of Domain Structure in Charge Density Wave States in 2H-TaS1.8Se0.2
Author(s) -
S. Ohta,
Yuita Fujisawa,
Satoshi Demura,
Hideaki Sakata
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1293/1/012004
Subject(s) - charge density wave , chalcogenide , superconductivity , condensed matter physics , scanning tunneling microscope , materials science , phase (matter) , charge ordering , quantum tunnelling , charge (physics) , phase transition , domain (mathematical analysis) , crystallography , chemistry , physics , quantum mechanics , mathematical analysis , mathematics , metallurgy
Transition metal dichalcogenides 2 H -TaS 2 and 2 H -TaSe 2 show charge density wave (CDW) state and superconductivity. It has been reported that elemental substitution of chalcogenide suppresses the CDW and enhances superconductivity. However, how the CDW order is suppressed by the substitution has not been clarified yet. To clarify this, we performed real space observation of the CDW state in the commensurate phase of 2 H -TaS 1.8 Se 0.2 by scanning tunneling microscopy. The existence of domains separated by walls at which the phase of the CDW shifts was observed. The change in the electronic state on the domain boundaries in 2 H -TaS 1.8 Se 0.2 was not as drastic as that in 1 T -Fe x Ta 1- x S 2 .