XY Ordering in Striped CuO 2 Planes in Underdoped Bi 2 Sr 2 CaCu 2 O 8 + δ
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Extremely correlated Fermi-liquid description of normal-state ARPES in cuprates.
The normal-state single particle spectral function of the high temperature superconducting cuprates, measured by the angle-resolved photoelectron spectroscopy (ARPES), has been considered both anomalous and crucial to understand. Here, we report an unprecedented success of the new extremely correlated Fermi liquid theory by one of us [B. S. Shastry, Phys. Rev. Lett. 107, 056403 (2011)] to descr...
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The gap anisotropy in Bi 2 Sr 2 CaCu 2 O 8+δ is revisited in the framework of a d-wave scenario in view of the recent angle-resolved photoemission experiment. Based on a tight-binding fit to the normal state dispersion, a detail analysis on the effects of the inclusion of the next harmonic in the d-wave has been presented. Significant effect has been observed in the superconducting T c. The den...
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We report the first low temperature scanning tunnelling microscopy and spec-troscopy study of high quality Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ crystals. We present atomic resolution and show spectroscopic data acquired on two different samples. In one case, for T c = 109 K and a transition width of only 1 K, we obtained an extremely homogeneous sample with ∆ p = 60 meV over at least 50 nm. In the other ...
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The Ba substitution by Sr has been studied in two Hg-2212 series: Hg 2 (Ba 1−y Sr y) 2 YCu 2 O 8−δ and Hg 2 (Ba 1−y Sr y) 2 (Y 0.80 Ca 0.20)Cu 2 O 8−δ. In both series a T c enhancement of about 40 K is observed when Sr substitutes Ba from y = 0 to y = 1.0. The y = 0 compound of the first series is the non superconducting Hg 2 Ba 2 YCu 2 O 8−δ prototype. In the second series, this y = 0 compound...
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