Direct Observation of a Nonmonotonic dx2-y2-Wave Superconducting Gap in the Electron-Doped High-Tc Superconductor Pr0.89LaCe0.11CuO4

Matsui, H.; Terashima, Kazuhiko; Sato, Takafumi; Takahashi, Takashi; Fujita, M.; Yamada, Kōsaku

doi:10.1103/physrevlett.95.017003

Cited by 164 publications

(131 citation statements)

References 25 publications

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“…5(a) for T = 0 and in Fig. 5(b) for T = 0.9 T c respectively, we obtain the "Fermi patches" at T << T c , and these features evolve into a single gapless point near T c because SDW has vanished at T * < T c , which are in good agreement with ARPES data [36]. We further illustrate in Fig.…”

supporting

confidence: 82%

“…For completeness, we examine whether the CO scenario with T * < T c can account for the absence of Fermi arcs in the electron-type cuprates [24,25]. By assuming d x 2 −y 2 -wave pairing and commensurate SDW with a wave-vector Q 3 = (π,π) [27] as the CO for the electron-type cuprate Pr 0.89 LaCe 0.11 CuO 4 (PLCCO) [36], we employ Eq. (4) to compute the corresponding Δ eff (k) in the first quadrant of the BZ with V CO = 4.2 meV and Δ SC = 5.5 meV.…”

mentioning

confidence: 99%

“…5(c) the momentumdependent ARPES leading edge data (×2) from Ref. [36] and the corresponding theoretical fitting curves by assuming either Q = (π,π) as in the case of commensurate SDW (dark line) or Q || (π,0)/(0,π) as in the case of CDW or disorder-pinned incommensurate SDW (light line). Clearly only the commensurate SDW is consistent with ARPES.…”

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confidence: 99%

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Possible competing order-induced Fermi arcs in cuprate superconductors

Wang

Beyer

et al. 2009

Solid State Communications

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We investigate the scenario of competing order (CO) induced Fermi arcs and pseudogap in cuprate superconductors. For hole-type cuprates, both phenomena as a function of temperature and doping level can be accounted for if the CO vanishes at T* above the superconducting transition T c and the CO wave-vector Q is parallel to the antinodal direction. In contrast, the absence of these phenomena and the non-monotonic d-wave gap in electron-type cuprates may be attributed to T* < T c and a CO wave-vector Q parallel to the nodal direction. PACS: 74.25.Jb, 74.50.+r, 79.60.Bm Keywords: Fermi arc; pseudogap; competing order; cuprate superconductors * Work done at Caltech while on visit from National Taiwan University.† Corresponding author. E-mail address: ncyeh@caltech.eduOne of the most debated issues in high-temperature superconductivity is the physical origin of various unconventional and often non-universal phenomena observed at temperatures above the superconducting transition T c [1][2][3][4][5]. Most of these strongly doping dependent phenomena are only associated with the hole-type cuprates, and are particularly pronounced in the underdoped regime. The specific unconventional phenomena include: opening of a pseudogap (PG) at a temperature T * > T c , below which there is incomplete suppression of the electronic density of states; formation of the "Fermi arcs" [3,[6][7][8] at T c < T < T * , which refers to the occurrence of a truncated Fermi surface in the PG state that is intermediate between the node of the d x 2 -y 2 -wave superconducting state at T < T c and the full Fermi surface of the normal state at T > T * ; marginal Fermi liquid behavior that leads to unconventional temperature dependence in the resistivity and magnetic susceptibility [9]; and anomalous Nernst effect above the superconducting transition [10]. Various theoretical models have been proposed to account for these unconventional quasiparticle excitations in the PG state. One school of thought may be generally referred to as the ``one-gap '' or ``preformed pair'' model [1,11-14], which asserts that the onset of pair formation occurs at T * and that the PG state at T c < T < T * is a disordered pairing state with strong phase fluctuations. The other school of thought considers the possibility of competing orders (CO's) [1,2,9,[15][16][17][18][19] so that one other energy scale V CO besides the superconducting gap Δ SC is responsible for the low-energy quasiparticle excitations.To date a number of experimental findings seem to favor this "two-gap" concept [7,[20][21][22][23], although quantitative analyses of the data based on this scenario were lacking. On the other hand, the preformed-pair model and the CO scenario need not be mutually exclusive. For instance, in the event of CO's coexisting with coherent Cooper pairs in the ground state, there is no reason why they cannot coexist with incoherent preformed pairs in the pseudogap phase slightly above T c .Recently, we have employed a phenomenological approach to quantitatively invest...

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confidence: 82%

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confidence: 99%

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Possible competing order-induced Fermi arcs in cuprate superconductors

Wang

Beyer

et al. 2009

Solid State Communications

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“…However, within their measurement uncertainty, they cannot rule out an anisotropic s-wave ordering parameter with a small gap below their detection limit. Matsui et al [333] present ARPES data on PLCCO that are described as "basically consistent" with dx2-y2 pairing symmetry.…”

Section: Arpesmentioning

confidence: 94%

Unconventional superconductivity

Stewart

2017

Advances in Physics

200

165

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Abstract:"Conventional" superconductivity, as used in this review, refers to electron-phonon coupled superconducting electron pairs described by BCS theory. Unconventional superconductivity refers to superconductors where the Cooper pairs are not bound together by phonon-exchange but instead by exchange of some other kind, e. g. spin fluctuations in a superconductor with magnetic order either coexistent or nearby in the phase diagram. Such unconventional superconductivity has been known experimentally since heavy fermion CeCu2Si2, with its strongly correlated 4f electrons, was discovered to superconduct below 0.6 K in 1979. Since the discovery of unconventional superconductivity in the layered cuprates in 1986, the study of these materials saw Tc jump to 164 K by 1994. Further progess in high temperature superconductivity would be aided by understanding the cause of such unconventional pairing. This review compares the fundamental properties of 9 unconventional superconducting classes of materialsfrom 4f-electron heavy fermions to organic superconductors to classes where only three known members exist to the cuprates with over 200 examples -with the hope that common features will emerge to help theory explain (and predict!) these phenomena. In addition, three new emerging classes of superconductors (topological, interfacial -e. g. FeSe on SrTiO3, and H2S under high pressure) are briefly covered, even though their "conventionality" is not yet fully determined.

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“…In the former scenario, suppression of superconductivity can lead to enhancement of AF if the two orders are antagonistic, as is seen in iron-based superconductors [38]. However, for the case of electron-doped cuprates, the energy scales are quite different for SC and AF, with the former having a maximum magnitude of ≈ 3-5 meV [39][40][41][42] and the latter having a magnitude > 80 meV [3,5]. Thus, the effect of suppressing SC on the magnitude of AF is not expected to be as large as it is in systems where the competing orders have energy scales comparable to one another.…”

Section: Isolating the Af Component With Magnetic Fieldmentioning

confidence: 99%

Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La2−xCexCuO4±δ

et al. 2017

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We used femtosecond optical pump-probe spectroscopy to study the photoinduced change in reflectivity of thin films of the electron-doped cuprate La 2−x Ce x CuO 4 (LCCO) with dopings of x = 0.08 (underdoped) and x = 0.11 (optimally doped). Above T c , we observe fluence-dependent relaxation rates that begin at a temperature similar to the one where transport measurements first show signatures of antiferromagnetic correlations. Upon suppressing superconductivity with a magnetic field, it is found that the fluence and temperature dependence of relaxation rates are consistent with bimolecular recombination of electrons and holes across a gap (2 AF ) originating from antiferromagnetic correlations which comprise the pseudogap in electron-doped cuprates. This can be used to learn about coupling between electrons and high-energy (ω > 2 AF ) excitations in these compounds and set limits on the time scales on which antiferromagnetic correlations are static.

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Direct Observation of a Nonmonotonic dx2-y2-Wave Superconducting Gap in the Electron-Doped High-Tc Superconductor Pr0.89LaCe0.11CuO4

Cited by 164 publications

References 25 publications

Possible competing order-induced Fermi arcs in cuprate superconductors

Possible competing order-induced Fermi arcs in cuprate superconductors

Unconventional superconductivity

Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La2−xCexCuO4±δ

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