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

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.

doi:10.1038/nphys2935

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

Journal Article · Sun Apr 06 00:00:00 EDT 2014 · Nature Physics

DOI:https://doi.org/10.1038/nphys2935· OSTI ID:1958844

Joe, Y. I. ^[1]; Chen, X. M. ^[1]; Ghaemi, P. ^[1]; Finkelstein, K. D. ^[2]; de la Peña, G. A. ^[1]; Gan, Y. ^[1]; Lee, J. C. T. ^[1]; Yuan, S. ^[1]; Geck, J. ^[3]; MacDougall, G. J. ^[1]; Chiang, T. C. ^[1]; Cooper, S. L. ^[1]; Fradkin, E. ^[1]; Abbamonte, P. ^[4]

Univ. of Illinois at Urbana-Champaign, IL (United States)
Cornell Univ., Ithaca, NY (United States)
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
Univ. of Illinois at Urbana-Champaign, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

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.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-06ER46285; FG02‐07ER46453; DMR‐0936384

OSTI ID:: 1958844

Journal Information:: Nature Physics, Vol. 10, Issue 6; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Ultrafast charge ordering by self-amplified exciton–phonon dynamics in TiSe2 Lian, Chao; Zhang, Sheng-Jie; Hu, Shi-Qi Nature Communications, Vol. 11, Issue 1 https://doi.org/10.1038/s41467-019-13672-7	journal	January 2020
Correlated electronic states at domain walls of a Mott-charge-density-wave insulator 1T-TaS2 Cho, Doohee; Gye, Gyeongcheol; Lee, Jinwon Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/s41467-017-00438-2	journal	August 2017

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