2026-09-22T00:43:25Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/49590 2023-07-11 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

Abbamonte, Peter M. Chiang, Tai-Chang Phillips, Philip W. Grosse Perdekamp, Matthias Abbamonte, Peter M. Joe, Young Il 2014-05-30T16:51:23Z 2014-05-30T16:51:23Z 2014-05 2014-05-30T16:51:23Z 2014-05 Superconductivity (SC) 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 SC and fluctuations in some other order parameter. 1T-TiSe2 is a prototypical CDW material in the transtion-metal dichalcogenide family and was previously shown to exhibit SC when the CDW is suppressed by hydrostatic pressure or intercalation of Cu atoms. Here, we present detailed high pressure x-ray scattering study on 1T-TiSe2. We found that the CDW phase of 1T-TiSe2 is completely suppressed on the application of hydrostatic pressure and established the existence of a quantum critical point (QCP) at $P_c = 5.1 +- 0.2 GPa, which is more than 1 GPa beyond the end of the SC region. Unexpectedly, at P = 3 GPa we observed a weakly first order, incommensurate CDW phase, suggesting the presence of a Lifshitz tricritical point somewhere above the superconducting dome. Our study suggests that SC in 1T-TiSe2 may not be directly connected to the QCP of the CDW order, but to the formation of CDW domain walls. Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2014-03-27T13:22:21Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Joe_YoungIl.tex: 141476 bytes, checksum: b46ffea5923ebfb5fa82a6c12e5368c0 (MD5) Joe_YoungIl.pdf: 10710729 bytes, checksum: 6504153e23580982e9b4828254fdb9cb (MD5) Made available in DSpace on 2014-05-30T16:51:23Z (GMT). No. of bitstreams: 2 Young Il_Joe.pdf: 10710839 bytes, checksum: 86b594eacd7ea67a7234ca41e7519c68 (MD5) license.txt: 4059 bytes, checksum: 6b0100914f048e3662bc02f10a19b857 (MD5) http://hdl.handle.net/2142/49590 en Copyright 2014 Young Il Joe charge density wave incommensurate charge density wave domain wall X-ray diffraction transition metal dichacogenide superconductivity high pressure low temperature Emergence of charge density wave domain walls above the superconducting dome in TiSe2 text Physics 1244 Physics 0240 University of Illinois at Urbana-Champaign Dissertation Ph.D. PHD:Physics -UIUC 10KS0240PHD