Introduction to the phenomenology of high temperature superconductors Patrick Le

Introduction to the phenomenology of high temperature superconductors Patrick Le www.phwiki.com

Introduction to the phenomenology of high temperature superconductors Patrick Le

Brillhart, Aaron, Host; Meteorologist has reference to this Academic Journal, PHwiki organized this Journal Introduction to the phenomenology of high temperature superconductors Patrick Lee in addition to T. Senthil High Tc Phase diagram Plan Overdoped – is it `conventional’ What is strange about the strange metal Phenomenology of the pseudogap Transition to superconductivity Eisaki et al, PRB 69, 064512 (2004) With further increase of layers, Tc does not go up further. The inner planes have less hole in addition to may be AF ordered.

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A preliminary look: transport Overdoped metal Does it have a Fermi surface Size in addition to shape Methods to detect – ARPES, deHaas-van Alphen in addition to related quantum oscillations, other eg Angle Dependant Magneto-Resistance (ADMR) Is it really a Fermi liquid with L in addition to au quasiparticles

ARPES (Angle Resolved Photoemission Spectroscopy) Overdoped metal: Is there a Fermi surface deHaas van Alphen, other `quantum oscillations’: classic Fermi surface determination methods

Remarks on quantum oscillations Quantum oscillations in Tl-2201 Tc = 10 K, B upto 60 T; oscillations in both M in addition to in c-axis Thermal conductivity: Wiedemann-Franz law

Is the OD state really a Fermi liquid High Tc Phase diagram Plan Overdoped – is it `conventional’ What is strange about the strange metal Theory interlude Phenomenology of the pseudogap 5. Transition to superconductivity The strange metal: electrical transport Linear-T resistivity near optimal doping with nearly zero intercept. Slope of resistivity/layer roughly the same (1.5 µ cm/K) as long as all materials. Sheet resistance = /d ~ (h/e^2) T/J Bi-2201

Linear resistivity at very low-T Tied to “quantum criticality” Quantum critical point: second order phase transition at T = 0 Magnetotransport: Hall effect Optical transport: high frequency tail

Optical transport: low frequency peak Spin physics: spin susceptibility in addition to NMR relaxation Dynamic spin correlations: neutron scattering in LSCO

ARPES: Fermi surface structure Analysis of ARPES data Absence of L in addition to au quasiparticles

Brillhart, Aaron KSWT-TV Host; Meteorologist www.phwiki.com

Transition to SC: onset of coherence Onset of coherence in transport Neutron resonance

Summary on strange metal Strange metal: Power laws in many physical quantities; Large Fermi surface but no L in addition to au-like quasiparticles Slow growth of antiferromagnetic spin correlations Transition to superconductivity accompanied by appearance of coherent quasiparticles in addition to a sharp spin triplet `resonance’ mode. Brief theory interlude Some basic questions How does a metal emerge from a Mott insulator 2. Why superconductivity Simple physical picture (Anderson1987): Superexchange favors as long as mation of singlet valence bonds between localized spins. Doped Mott insulator: Hole motion in background of valence bonds. Cartoon pictures Large doping: Hubbard-U not very effective in blocking charge motion Expect `large Fermi surface’ with area set by 1-x. What happens as doping is reduced to approach Mott insulator

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Brillhart, Aaron Host; Meteorologist

Brillhart, Aaron is from United States and they belong to KSWT-TV and they are from  Yuma, United States got related to this Particular Journal. and Brillhart, Aaron deal with the subjects like Meteorology

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