97 research outputs found
Raising Tc in charge density wave superconductor ZrTe3 by Ni intercalation
We report discovery of bulk superconductivity in Ni0.05ZrTe3 at Tc = 3.1 K,
obtained through Ni intercalation. Superconductivity coexists with charge
density wave (CDW) state with TCDW = 41 K. When compared to parent material
ZrTe3, filamentary superconducting transition is substantially increased
whereas TCDW was suppressed. The analysis of superconducting state indicates
that Ni0.05ZrTe3 is an intermediately coupled superconductor.Comment: 5 pages, 5 figure
Microscopic evidence for strong periodic lattice distortion in 2D charge-density wave systems
In the quasi-2D electron systems of the layered transition metal
dichalcogenides (TMD) there is still a controversy about the nature of the
transitions to charge-density wave (CDW) phases, i.e. whether they are
described by a Peierls-type mechanism or by a lattice-driven model. By
performing scanning tunneling microscopy (STM) experiments on the canonical
TMD-CDW systems, we have imaged the electronic modulation and the lattice
distortion separately in 2H-TaS, TaSe, and NbSe. Across the three
materials, we found dominant lattice contributions instead of the electronic
modulation expected from Peierls transitions, in contrast to the CDW states
that show the hallmark of contrast inversion between filled and empty states.
Our results imply that the periodic lattice distortion (PLD) plays a vital role
in the formation of CDW phases in the TMDs and illustrate the importance of
taking into account the more complicated lattice degree of freedom when
studying correlated electron systems
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