Polytypism, polymorphism, and superconductivity in TaSe 2 −x Te x

Luo, Huixia; Xie, Weiwei; Tao, Jing; Inoue, Hiroyuki; Gyenis, András; Krizan, Jason W.; Yazdani, Ali; Zhu, Yimei; Cava, Robert Joseph

doi:10.1073/pnas.1502460112

Title: Polytypism, polymorphism, and superconductivity in TaSe ₂ _−x Te _x

Journal Article · Tue Mar 03 00:00:00 EST 2015 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1502460112· OSTI ID:1235154

Luo, Huixia ^[1]; Xie, Weiwei ^[1]; Tao, Jing ^[2]; Inoue, Hiroyuki ^[3]; Gyenis, András ^[3]; Krizan, Jason W. ^[1]; Yazdani, Ali ^[3]; Zhu, Yimei ^[2]; Cava, Robert Joseph ^[1]

Department of Chemistry and
Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973
Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, NJ 08544, and

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 2 stable polytypes and 2 stable polymorphs in the TaSe_2-xTe_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. Thus, the reason for this dramatic change is not apparent, but we propose that it arises either from a remarkable dependence of T_c on subtle differences in the characteristics of the single layers present, or from a surprising effect of the layer stacking sequence on electronic properties that instead are expected to be dominated by the properties of a single layer in materials of this kind.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: DE FG02-08ER46544; AC02-98CH10886; SC00112704

OSTI ID:: 1235154

Alternate ID(s):: OSTI ID: 1193219

Report Number(s):: BNL-108044-2015-JA

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 112 Journal Issue: 11; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 88 works

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Title: Polytypism, polymorphism, and superconductivity in TaSe 2 −x Te x

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Title: Polytypism, polymorphism, and superconductivity in TaSe ₂ _−x Te _x