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Title: Emergence of charge density wave domain walls above the superconducting dome in 1T-TiSe2

Abstract

Superconductivity in so-called unconventional superconductors is nearly always found in the vicinity of another ordered state, such as antiferromagnetism, charge density wave (CDW), or stripe order. This suggests a fundamental connection between superconductivity and fluctuations in some other order parameter. To better understand this connection, we used high-pressure X-ray scattering to directly study the CDW order in the layered dichalcogenide TiSe2, which was previously shown to exhibit superconductivity when the CDW is suppressed by pressure or intercalation of Cu atoms. As a result, we succeeded in suppressing the CDW fully to zero temperature, establishing for the first time the existence of a quantum critical point (QCP) at Pc = 5.1 ± 0.2 GPa, which is more than 1 GPa beyond the end of the superconducting region. Unexpectedly, at P = 3 GPa we observed a reentrant, weakly first order, incommensurate phase, indicating the presence of a Lifshitz tricritical point somewhere above the superconducting dome. Our study suggests that superconductivity in TiSe2 may not be connected to the QCP itself, but to the formation of CDW domain walls.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [3];  [1];  [1];  [1];  [1];  [4]
+ Show Author Affiliations
  1. Univ. of Illinois at Urbana-Champaign, IL (United States)
  2. Cornell Univ., Ithaca, NY (United States)
  3. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  4. Univ. of Illinois at Urbana-Champaign, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1958844
Grant/Contract Number:  
FG02-06ER46285; FG02‐07ER46453; DMR‐0936384
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 10; Journal Issue: 6; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; X-ray scattering; charge density waves; superconductivity

Citation Formats

Joe, Y. I., Chen, X. M., Ghaemi, P., Finkelstein, K. D., de la Peña, G. A., Gan, Y., Lee, J. C. T., Yuan, S., Geck, J., MacDougall, G. J., Chiang, T. C., Cooper, S. L., Fradkin, E., and Abbamonte, P. Emergence of charge density wave domain walls above the superconducting dome in 1T-TiSe2. United States: N. p., 2014. Web. doi:10.1038/nphys2935.
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Joe, Y. I., Chen, X. M., Ghaemi, P., Finkelstein, K. D., de la Peña, G. A., Gan, Y., Lee, J. C. T., Yuan, S., Geck, J., MacDougall, G. J., Chiang, T. C., Cooper, S. L., Fradkin, E., & Abbamonte, P. Emergence of charge density wave domain walls above the superconducting dome in 1T-TiSe2. United States. https://doi.org/10.1038/nphys2935
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Joe, Y. I., Chen, X. M., Ghaemi, P., Finkelstein, K. D., de la Peña, G. A., Gan, Y., Lee, J. C. T., Yuan, S., Geck, J., MacDougall, G. J., Chiang, T. C., Cooper, S. L., Fradkin, E., and Abbamonte, P. Sun . "Emergence of charge density wave domain walls above the superconducting dome in 1T-TiSe2". United States. https://doi.org/10.1038/nphys2935. https://www.osti.gov/servlets/purl/1958844.
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@article{osti_1958844,
title = {Emergence of charge density wave domain walls above the superconducting dome in 1T-TiSe2},
author = {Joe, Y. I. and Chen, X. M. and Ghaemi, P. and Finkelstein, K. D. and de la Peña, G. A. and Gan, Y. and Lee, J. C. T. and Yuan, S. and Geck, J. and MacDougall, G. J. and Chiang, T. C. and Cooper, S. L. and Fradkin, E. and Abbamonte, P.},
abstractNote = {Superconductivity in so-called unconventional superconductors is nearly always found in the vicinity of another ordered state, such as antiferromagnetism, charge density wave (CDW), or stripe order. This suggests a fundamental connection between superconductivity and fluctuations in some other order parameter. To better understand this connection, we used high-pressure X-ray scattering to directly study the CDW order in the layered dichalcogenide TiSe2, which was previously shown to exhibit superconductivity when the CDW is suppressed by pressure or intercalation of Cu atoms. As a result, we succeeded in suppressing the CDW fully to zero temperature, establishing for the first time the existence of a quantum critical point (QCP) at Pc = 5.1 ± 0.2 GPa, which is more than 1 GPa beyond the end of the superconducting region. Unexpectedly, at P = 3 GPa we observed a reentrant, weakly first order, incommensurate phase, indicating the presence of a Lifshitz tricritical point somewhere above the superconducting dome. Our study suggests that superconductivity in TiSe2 may not be connected to the QCP itself, but to the formation of CDW domain walls.},
doi = {10.1038/nphys2935},
journal = {Nature Physics},
number = 6,
volume = 10,
place = {United States},
year = {Sun Apr 06 00:00:00 EDT 2014},
month = {Sun Apr 06 00:00:00 EDT 2014}
}
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    Works referencing / citing this record:

    Ultrafast charge ordering by self-amplified exciton–phonon dynamics in TiSe2
    journal, January 2020

    Correlated electronic states at domain walls of a Mott-charge-density-wave insulator 1T-TaS2
    journal, August 2017

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