Polytypism, polymorphism, and superconductivity in TaSe(2-x)Te(x)

Proceedings of the National Academy of Sciences of the United States of America
Huixia LuoRobert Joseph Cava

Abstract

Polymorphism in materials often leads to significantly different physical properties--the rutile and anatase polymorphs of TiO2 are a prime example. Polytypism is a special type of polymorphism, occurring in layered materials when the geometry of a repeating structural layer is maintained but the layer-stacking sequence of the overall crystal structure can be varied; SiC is an example of a material with many polytypes. Although polymorphs can have radically different physical properties, it is much rarer for polytypism to impact physical properties in a dramatic fashion. Here we study the effects of polytypism and polymorphism on the superconductivity of TaSe2, one of the archetypal members of the large family of layered dichalcogenides. We show that it is possible to access two stable polytypes and two stable polymorphs in the TaSe(2-x)Te(x) solid solution and find that the 3R polytype shows a superconducting transition temperature that is between 6 and 17 times higher than that of the much more commonly found 2H polytype. The reason for this dramatic change is not apparent, but we propose that it arises either from a remarkable dependence of Tc on subtle differences in the characteristics of the single layers present or from ...Continue Reading

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Citations

Jan 13, 2016·ACS Nano·Jae-Ung LeeHyeonsik Cheong
Jan 26, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Hua BaiZhu-An Xu
Apr 6, 2020·Nanoscale·Soo Yeon LimHyeonsik Cheong
Aug 8, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Chunxu Bai, Yanling Yang
Aug 21, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Huixia LuoR J Cava
Feb 15, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Hua BaiZhu-An Xu
Jul 19, 2019·Nature Communications·Yangyang LiJingsheng Chen
Feb 13, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Catherine WitteveenFabian O von Rohr
Oct 31, 2020·Physical Review Letters·Ismail El BaggariLena F Kourkoutis
Dec 22, 2020·Chemical Reviews·Phil D C KingGiancarlo Panaccione
May 18, 2021·Inorganic Chemistry·Jin-Ke BaoMercouri G Kanatzidis
Aug 5, 2017·Nano Letters·Masaro YoshidaYoshihiro Iwasa
Feb 6, 2020·Nano Letters·Yuki TanakaYoshihiro Iwasa
Apr 21, 2020·Inorganic Chemistry·Xin GuiWeiwei Xie
Jun 30, 2018·Chemical Reviews·Gang Hee HanYoung Hee Lee
Jan 22, 2020·Journal of the American Chemical Society·Ya DengZheng Liu
Sep 18, 2021·Inorganic Chemistry·Kelsey L HodgeJoshua E Goldberger

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