The Normal-State Transport Properties of the High-Temperature Cuprate Superconductors

The U(1)×SU(2) Chern–Simons gauge theory is applied to study the 2D t–J model describing the normal state of underdoped cuprate superconductors. The U(1) field produces a flux phase for holons converting them into Dirac-like fermions, while the SU(2) field, due to the coupling to holons gives rise to a gap for spinons. An effective low-energy action involving holons, spinons and a self-generated U(1) gauge field is derived. The Fermi surface and electron spectral function obtained are consistent with photoemission experiments. The theory predicts a minimal gap proportional to doping concentration. It also explains anomalous transport properties.

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The Strange Metal State of the Electron-Doped Cuprates

Annual Review of Condensed Matter Physics ◽

10.1146/annurev-conmatphys-031119-050558 ◽

2020 ◽

Vol 11 (1) ◽

pp. 213-229 ◽

Cited By ~ 5

Author(s):

Richard L. Greene ◽

Pampa R. Mandal ◽

Nicholas R. Poniatowski ◽

Tarapada Sarkar

Keyword(s):

Phase Diagram ◽

High Temperature ◽

Copper Oxide ◽

Normal State ◽

Cuprate Superconductors ◽

Condensed Matter ◽

Metallic State ◽

Final Theory ◽

Physics Community ◽

Metal State

An understanding of the high-temperature copper oxide (cuprate) superconductors has eluded the physics community for over thirty years and represents one of the greatest unsolved problems in condensed matter physics. Particularly enigmatic is the normal state from which superconductivity emerges, so much so that this phase has been dubbed a “strange metal.” In this article, we review recent research into this strange metallic state as realized in the electron-doped cuprates with a focus on their transport properties. The electron-doped compounds differ in several ways from their more thoroughly studied hole-doped counterparts, and understanding these asymmetries of the phase diagram may prove crucial to developing a final theory of the cuprates. Most of the experimental results discussed in this review have yet to be explained and remain an outstanding challenge for theory.

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Application of a lindhard like model for normal state transport properties of the cuprate superconductors

Zeitschrift für Physik B Condensed Matter ◽

10.1007/bf01315641 ◽

1992 ◽

Vol 87 (2) ◽

pp. 143-153 ◽

Cited By ~ 19

Author(s):

M. Weger ◽

D. Wohlleben

Keyword(s):

Transport Properties ◽

Normal State ◽

Cuprate Superconductors

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DENSITY OF STATES AND TRANSPORT PROPERTIES IN NORMAL STATE OF CUPRATE-SUPERCONDUCTORS

International Journal of Modern Physics B ◽

10.1142/s0217979299001612 ◽

1999 ◽

Vol 13 (13) ◽

pp. 1633-1643 ◽

Cited By ~ 8

Author(s):

S. BASAK ◽

S. K. GHATAK

Keyword(s):

Transport Properties ◽

Electric Power ◽

Carrier Concentration ◽

Density Of States ◽

Normal State ◽

Cuprate Superconductors ◽

Resonance Condition ◽

Thermo Electric ◽

Three State Model ◽

Transfer Integral

Three-state model for quasi-two dimensional Cu-O layer of oxide superconductor is considered. The density of states and transport properties (resistivity and thermo-electric power) in normal state are calculated for resonance and non-resonance condition of Cu d-level and O p-level. Thermoelectric power can be positive or negative depending on carrier concentration, bare charge transfer gap and transfer integral between d–p and p–p states and its sign changes at higher temperature. The thermo-electric power when positive passes through a maximum with increase in temperature. The value at its maximum and its location moves up with decrease in carrier concentration. The thermal variation of resistivity changes from metallic like (linear in -T) to semiconducting-like as carrier concentration reduces by small amount.

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FIELD-INDUCED ANTIFERROMAGNETISM IN THE HIGH-TEMPERATURE SUPERCONDUCTOR La2-xSrxCuO4

International Journal of Modern Physics B ◽

10.1142/s0217979202013924 ◽

2002 ◽

Vol 16 (20n22) ◽

pp. 3197-3197

Author(s):

B. LAKE ◽

T. E. MASON ◽

G. AEPPLI ◽

K. LEFMANN ◽

N. B. CHRISTENSEN ◽

...

Keyword(s):

Magnetic Field ◽

High Temperature ◽

Normal State ◽

Cuprate Superconductors ◽

High Temperature Superconductivity ◽

Field Measurements ◽

Spin Fluctuations ◽

Magnetic Interactions ◽

Zero Field ◽

Zero Resistance

There is strong evidence that magnetic interactions play a crucial role in the mechanism driving high-temperature superconductivity in cuprate superconductors. To investigate this we have done a series of neutron scattering measurements on La 2-x Sr x CuO 4 (LSCO) in an applied magnetic field. Below Tc the field penetrates the superconductor via an array of normal state metallic inclusions or vortices. Phase coherent superconductivity characterized by zero resistance sets in at the lower field-dependent irreversibility temperature (Tirr). We have measured optimally doped LSCO (x = 0.16, Tc = 38.5 K ) and under-doped LSCO ( x = 0.10, Tc = 29 K ); both have an enhanced antiferromagnetic response in a field. Measurements of the optimally doped system at H = 7.5 T show that sub-gap spin fluctuations first disappear with the loss of finite resistivity at Tirr, but then reappear at a lower temperature with increased lifetime and correlation length compared to the normal state. In the under-doped system elastic antiferromagnetism develops below Tc in zero field, and is significantly enchanced by application of a magnetic field. Phase coherent superconductivity is then established within the antiferromagnetic phase at Tirr; thus, the situation in under-doped LSCO is the reverse of that for the optimally doped LSCO where the zero-resistance state develops first before the onset of antiferromagnetism.

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STABLE hc/e VORTICES IN SUPERCONDUCTORS WITH SPIN-CHARGE SEPARATION

International Journal of Modern Physics B ◽

10.1142/s0217979292000293 ◽

1992 ◽

Vol 06 (05n06) ◽

pp. 509-526

Author(s):

Subir Sachdev

Keyword(s):

Magnetic Field ◽

Magnetic Flux ◽

Normal State ◽

Phenomenological Model ◽

Charge Separation ◽

Cuprate Superconductors ◽

Superconducting Phase ◽

Low Energy ◽

Large N ◽

Normal State Properties

A phenomenological model, F, of the superconducting phase of systems with spin-charge separation and antiferromagnetically induced pairing is studied. Above Hc1, magnetic flux can always pierce the superconductor in vortices with flux hc/2e, but regimes are found in which vortices with flux hc/e are preferred. Little-Park and other experiments, which examine periodicities with a varying magnetic field, always observe a period of hc/2e. The low energy properties of a symplectic large-N expansion of a model of the cuprate superconductors are argued to be well described by F. This analysis and some normal state properties of the cuprates suggest that hc/e vortices should be stable at the lowest dopings away from the insulating state at which superconductivity first occurs.

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