Differences in chemical doping matter: Superconductivity in Ti1-xTaxSe2 but not in Ti1-xNbxSe2

Luo, Huixia; Zhu, Yimei; Xie, Weiwei; Tao, Jing; Pletikosic, Ivo; Valla, Tonica; Sahasrabudhe, Girija S.; Osterhoudt, Gavin; Sutton, Eric; Burch, Kenneth S.; Seibel, Elizabeth M.; Krizan, Jason W.; Cava, Robert J.

doi:10.1021/acs.chemmater.6b00288

Title: Differences in chemical doping matter: Superconductivity in Ti_1-xTa_xSe₂ but not in Ti_1-xNb_xSe₂

Journal Article · Sun Feb 21 00:00:00 EST 2016 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.6b00288· OSTI ID:1263907

Luo, Huixia ^[1]; Zhu, Yimei ^[2]; Xie, Weiwei ^[1]; Tao, Jing ^[2]; Pletikosic, Ivo ^[3]; Valla, Tonica ^[2]; Sahasrabudhe, Girija S. ^[1]; Osterhoudt, Gavin ^[4]; Sutton, Eric ^[4]; Burch, Kenneth S. ^[4]; Seibel, Elizabeth M. ^[1]; Krizan, Jason W. ^[1]; Cava, Robert J. ^[1]

Princeton Univ., Princeton, NJ (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Princeton Univ., Princeton, NJ (United States)
Boston College, Chestnut Hill, MA (United States)

We report that 1T-TiSe₂, an archetypical layered transition metal dichalcogenide, becomes superconducting when Ta is substituted for Ti but not when Nb is substituted for Ti. This is unexpected because Nb and Ta should be chemically equivalent electron donors. Superconductivity emerges near x = 0.02 for Ti_1–xTa_xSe₂, while, for Ti_1–xNb_xSe₂, no superconducting transitions are observed above 0.4 K. The equivalent chemical nature of the dopants is confirmed by X-ray photoelectron spectroscopy. ARPES and Raman scattering studies show similarities and differences between the two systems, but the fundamental reasons why the Nb and Ta dopants yield such different behavior are unknown. We present a comparison of the electronic phase diagrams of many electron-doped 1T-TiSe₂ systems, showing that they behave quite differently, which may have broad implications in the search for new superconductors. Here, we propose that superconducting Ti_0.8Ta_0.2Se₂ will be suitable for devices and other studies based on exfoliated crystal flakes.

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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:: SC00112704

OSTI ID:: 1263907

Report Number(s):: BNL-112258-2016-JA; R&D Project: MA015MACA; PO016; KC0201010; KC0202020

Journal Information:: Chemistry of Materials, Vol. 28, Issue 6; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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Title: Differences in chemical doping matter: Superconductivity in Ti_1-xTa_xSe₂ but not in Ti_1-xNb_xSe₂