The Strange Metal State of the Electron-Doped Cuprates

Greene, R. L.; Mandal, Purnendu; Poniatowski, Nicholas R.; Sarkar, Tarapada

doi:10.1146/annurev-conmatphys-031119-050558

Cited by 113 publications

(70 citation statements)

References 100 publications

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“…Figure 1a shows the plots of temperature (T) versus in-plane resistance (R ab ) for one of the high quality Bi-2212 samples subjected to the pressures ranging from 0.97 GPa to 13.7 GPa. It is seen that the R ab (T) measured at 0.97 GPa displays a T-linear behavior over the temperature range above its onset T C (~96 K), manifesting that the sample is nearly in the ambient-pressure SM normal state and in an optimally-doped superconducting state 13,14 . Unexpectedly, at the pressure of ~ 2.8 GPa, we found a small resistance drop at the temperature about 20 K higher than its ambient-pressure T C .…”

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confidence: 93%

“…Structurally, the hole-doped cuprate superconductors hold peculiar octagonal or pyramid lattice with apical oxygen, which intrinsically leads to a complicated and unsteady lattice upon cooling due to the Jahn-Teller effect. Therefore, their normal states above the superconducting (SC) state, such as pseudogap (PG) 11,12 , strange metal (SM) 13,14 and anomalous Fermi liquid (FL) 15,16 , are full of the unknown physics of determining superconductivity 17,18 .…”

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confidence: 99%

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Crossover from two-dimensional to three-dimensional superconducting states in bismuth-based cuprate superconductor

et al. 2019

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To decipher the mechanism of high temperature superconductivity, it is important to know how the superconducting pairing emerges from the unusual normal states of cuprate superconductors, including pseudogap, anomalous Fermi liquid and strange metal (SM). A long-standing issue under debate is how the superconducting pairing is formed and condensed in the SM phase because the superconducting transition temperature is the highest in this phase. Here, we report the first experimental observation of a pressure-induced crossover from two-to three-dimensional superconducting states in the optimally-doped Bi 2 Sr 2 CaCu 2 O 8+ bulk superconductor at a pressure above 2.8 GPa, through state-of-the-art in-situ high-pressure measurements of resistance, magnetoresistance and magnetic susceptibility. By analyzing the temperature dependence of resistance, we find that the two-dimensional (2D) superconducting transition exhibits a Berezinski-Kosterlitz-Thouless-like behavior. The emergence of this 2D superconducting transition provides direct and strong evidence that the SM state is predominantly 2D-like. This is important to a thorough understanding of the phase diagram of cuprate superconductors.

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confidence: 93%

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confidence: 99%

Crossover from two-dimensional to three-dimensional superconducting states in bismuth-based cuprate superconductor

et al. 2019

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“…For electron-doped copper oxides, a perfect linear-in-T resistivity persists down to 40 mK in Pr 2-x Ce x CuO 4 8 and to 20 mK in La 2-x Ce x CuO 4 (LCCO) 9 . In particular, the strange-metal behavior in LCCO was found to start at the doping level associated with the Fermi surface reconstruction (x ≈ 0.14) to the endpoint of the superconducting dome (x c ≈ 0.175 ± 0.005), where it enters a metallic (non-superconducting) Fermi liquid state 11 . Very recently the strange-metal state has also been observed in the antiferromagnetic (AF) regime (e.g.…”

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confidence: 99%

“…There has been a concerted effort in the community to quantify the relationship between A 1 and T c as a direct function of the chemical doping concentration 10,11 .…”

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confidence: 99%

Universal scaling of the critical temperature and the strange-metal scattering rate in unconventional superconductors

Jin¹,

Yuan²,

Chen³

et al. 2021

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Dramatic evolution of properties with minute change in the doping level is a hallmark of the complex chemistry which governs copper oxide superconductivity as manifested in the celebrated superconducting domes as well as quantum criticality taking place at precise compositions. The strange metal state, where the resistivity varies linearly with temperature, has emerged as a central feature in the normal state of copper oxide superconductors. The ubiquity of this behavior signals an intimate link between the scattering mechanism and superconductivity. However, a clear quantitative picture of the correlation has been lacking. Here, we report the observation of quantitative scaling laws between the superconducting transition temperature Tc and the scattering rate associated with the strange metal state in electron-doped copper oxide La2-xCexCuO4 (LCCO) as a precise function of the doping level (x). High-resolution characterization of epitaxial composition-spread films, which encompass the entire overdoped range of LCCO has allowed us to systematically map its structural and transport properties with unprecedented accuracy and increment of Δx = 0.0015. We have uncovered the relations Tc ~ (xc-x)0.5 ~ (A1)0.5, where xc is the critical doping where superconductivity disappears on the overdoped side and A1 is the scattering rate of perfect T-linear resistivity per CuO2 plane. We argue that the striking similarity of the Tc vs A1 relation among copper oxides, iron-based and organic superconductors is an indication of a common mechanism of the strange metal behavior and unconventional superconductivity in these systems.

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“…In these materials, superconductivity coexists with another symmetry-breaking phenomenon manifested in a Fermi-surface reconstruction as detected by angle-resolved photoemission spectroscopy (ARPES) [18][19][20][21] and SdH experiments [22][23][24][25] . The involvement of magnetism in this Fermi-surface reconstruction has been broadly debated [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] . Here we present detailed data on the SdH amplitude in optimally doped NCCO, tracing its variation over more than two orders of magnitude with changing the field orientation.…”

Section: Introductionmentioning

confidence: 99%

Experimental evidence for Zeeman spin–orbit coupling in layered antiferromagnetic conductors

et al. 2021

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Most of solid-state spin physics arising from spin–orbit coupling, from fundamental phenomena to industrial applications, relies on symmetry-protected degeneracies. So does the Zeeman spin–orbit coupling, expected to manifest itself in a wide range of antiferromagnetic conductors. Yet, experimental proof of this phenomenon has been lacking. Here we demonstrate that the Néel state of the layered organic superconductor κ-(BETS)2FeBr4 shows no spin modulation of the Shubnikov–de Haas oscillations, contrary to its paramagnetic state. This is unambiguous evidence for the spin degeneracy of Landau levels, a direct manifestation of the Zeeman spin–orbit coupling. Likewise, we show that spin modulation is absent in electron-doped Nd1.85Ce0.15CuO4, which evidences the presence of Néel order in this cuprate superconductor even at optimal doping. Obtained on two very different materials, our results demonstrate the generic character of the Zeeman spin–orbit coupling.

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The Strange Metal State of the Electron-Doped Cuprates

Cited by 113 publications

References 100 publications

Crossover from two-dimensional to three-dimensional superconducting states in bismuth-based cuprate superconductor

Crossover from two-dimensional to three-dimensional superconducting states in bismuth-based cuprate superconductor

Universal scaling of the critical temperature and the strange-metal scattering rate in unconventional superconductors

Experimental evidence for Zeeman spin–orbit coupling in layered antiferromagnetic conductors

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