Transport anomalies and quantum criticality in electron-doped cuprate superconductors

Zhang, Xu; Yu, Heshan; He, Ge; Hu, W.; Yuan, Jie; Zhu, Bo; Jin, Kui

doi:10.1016/j.physc.2016.03.014

Cited by 16 publications

(18 citation statements)

References 231 publications

(379 reference statements)

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“…This is consistent with the increase of the residual resistivity with increasing oxygen content as reported in Ref. 50. Similar electrically driven redox reaction and the associated structural change has been observed in Ce oxides 52 .…”

Section: T(k) R(ω)supporting

confidence: 92%

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Healing Effect of Controlled Anti‐Electromigration on Conventional and High‐T_c Superconducting Nanowires

Baumans

Lombardo

Brisbois

et al. 2017

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The electromigration process has the potential capability to move atoms one by one when properly controlled. It is therefore an appealing tool to tune the cross section of monoatomic compounds with ultimate resolution or, in the case of polyatomic compounds, to change the stoichiometry with the same atomic precision. We demonstrate that a combination of electromigration and antielectromigration can be used to reversibly displace atoms with a high degree of control. This enables a fine adjustment of the superconducting properties of Al weak links, whereas in Nb the diffusion of atoms leads to a more irreversible process. In a superconductor with a complex unit cell (La2−xCexCuO4), the electromigration process acts selectively on the oxygen atoms with no apparent modification of the structure. This allows us to adjust the doping of this compound and switch from a superconducting behaviour to an insulating state in a nearly reversible fashion. We discuss the conditions needed to replace feedback controlled electromigration by a simpler technique of electropulsing. These findings have a direct practical application as a method to explore the dependence of the characteristic parameters on the exact oxygen content and pave the way towards a reversible control of local properties of nanowires.

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Section: T(k) R(ω)supporting

confidence: 92%

“…In the T-phase, one Cu atom and six oxygen atoms form an octahedron, whereas in the T'-phase the two apical oxygens are removed or moved to the rare-earth blocks (see Fig1 in Ref. 50). The YBCO has a T* structure, where only one apical oxygen is detached from the octahedron.…”

Section: T(k) R(ω)mentioning

confidence: 99%

Healing Effect of Controlled Anti‐Electromigration on Conventional and High‐T_c Superconducting Nanowires

Baumans

Lombardo

Brisbois

et al. 2017

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“…e . MR ~ A 0 B 2 2 , the slope A 0 can be obtained for these samples at different temperatures. In Drude model, A 0 is proportional to μ 2 ( i .…”

Section: Resultsmentioning

confidence: 99%

“…In the research on oxide superconductors, the oxygen always plays an important role in the superconductivity and their normal state behaviors 1,2 . In copper oxide high- critical temperature ( T c ) superconductors, such as Nd 2-x Ce x CuO 4±δ 3–5 , Pr 2− x Ce x CuO 4±δ 6–8 and YBa 2 Cu 3 O 7−δ 9–11 , T c can be greatly improved in a large range by adjusting the oxygen content during the annealing process, as well as the titanium oxide systems, such as SrTiO 3 12,13 and TiO 14,15 .…”

Section: Introductionmentioning

confidence: 99%

The effects of oxygen in spinel oxide Li1+xTi2−xO4−δ thin films

Jia

et al. 2018

Sci Rep

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The evolution from superconducting LiTi2O4-δ to insulating Li4Ti5O12 thin films has been studied by precisely tuning the oxygen pressure in the sample fabrication process. In superconducting LiTi2O4-δ films, with the increase of oxygen pressure, the oxygen vacancies are filled gradually and the c-axis lattice constant decreases. When the oxygen pressure increases to a certain critical value, the c-axis lattice constant becomes stable, which implies that the sample has been completely converted to Li4Ti5O12 phase. The two processes can be manifested by the angular bright-field images of the scanning transmission electron microscopy techniques. The transition temperature (Tch) of magnetoresistance from the positive to the negative shows a nonmonotonic behavior, i.e. first decrease and then increase, with the increase of oxygen pressure. We suggest that the decrease Tch can be attributed to the suppressing of orbital-related state, and the inhomogeneous phase separated regions contribute positive MR and thereby lead to the reverse relation between Tch and oxygen pressure.

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“…non-Fermi liquid behavior, pseudogap, etc [1][2][3][4][5]. The origination of the pseudogap is a protracted struggle for hole-doped cuprates, i.e.…”

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confidence: 99%

Normal-state gap in the parent cuprate Pr2CuO4±δ

Wei

Zhang

et al. 2017

Phys. Rev. B

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We present a tunneling study on single crystalline parent cuprate thin films, i.e. a series of Pr 2 CuO 4±δ (PCO) with tunable superconducting transition temperature. The zero-bias anomaly of differential conductance, well reported in the normal state of R 2−x Ce x CuO 4 (R = Pr, Nd, La) and named as normal state gap (NSG), is observed in the Ce-free samples. This NSG behaves quite robust against the magnetic field up to 16 T, but fades away with increasing the temperature. Most importantly, we find that the magnitude of the NSG becomes larger with increasing point-contact junction resistance on the superconducting films, which is further enhanced in the non-superconducting samples of more oxygen disorders. The origination of NSG can be understood in the framework of Altshuler-Aronov-Lee (AAL) theory, where the disorder-induced electron-electron interactions suppress the density of states and thereby result in a soft Coulomb gap.

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Transport anomalies and quantum criticality in electron-doped cuprate superconductors

Cited by 16 publications

References 231 publications

Healing Effect of Controlled Anti‐Electromigration on Conventional and High‐T_c Superconducting Nanowires

Healing Effect of Controlled Anti‐Electromigration on Conventional and High‐T_c Superconducting Nanowires

The effects of oxygen in spinel oxide Li1+xTi2−xO4−δ thin films

Normal-state gap in the parent cuprate Pr2CuO4±δ

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Transport anomalies and quantum criticality in electron-doped cuprate superconductors

Cited by 16 publications

References 231 publications

Healing Effect of Controlled Anti‐Electromigration on Conventional and High‐Tc Superconducting Nanowires

Healing Effect of Controlled Anti‐Electromigration on Conventional and High‐Tc Superconducting Nanowires

The effects of oxygen in spinel oxide Li1+xTi2−xO4−δ thin films

Normal-state gap in the parent cuprate Pr2CuO4±δ

Contact Info

Product

Resources

About

Healing Effect of Controlled Anti‐Electromigration on Conventional and High‐T_c Superconducting Nanowires

Healing Effect of Controlled Anti‐Electromigration on Conventional and High‐T_c Superconducting Nanowires