Energy scale directly related to superconductivity in high-Tccuprates: Universality from the temperature-dependent angle-resolved photoemission of Bi2Sr

Abstract

We have performed a temperature dependent angle-resolved photoemission spectroscopy (ARPES) study of the tri-layer high-Tc cuprate superconductor (HTSC) Bi2Sr2Ca2Cu3O 10+δ (Bi2223), and have shown that the "effective"superconducting (SC) gap ∆sc defined at the end point of the Fermi arc and the Tc (= 110 K) approximately satisfies the weak-coupling BCS-relationship 2∆sc = 4.3kBTc. Combining this result with previous ARPES results on single-and double-layer cuprates, we show that the relationship between 2∆sc = 4.3kBTc holds for various HTSCs. Furthermore, at T ∼ Tc, the quasi-patricle width at the end point of the Fermi arc is found to coincide with ∆sc, consistent with the context of Planckian dissipation.

Spatially modulated electronic nematicity in the three-band model of cuprate superconductors

“…Photoemission experiments on underdoped Bi cuprates have found spectral features [21][22][23][24] that are consistent with competing nonsuperconducting phases. Scanning tunneling microscopy (STM) experiments [25][26][27][28][29][30][31] further pointed to intraunit cell charge order.…”

Effect of electron-phonon coupling in the ARPES spectra of the tri-layer cuprate Bi2Sr2Ca2Cu3O10+δ

“…According to our previous studies [16,20] with experiment, and the unusually large kink energy for the IP band can be understood. Since phonon bands are located from 12 to 72 meV according to optical measurements of Bi2223 [22], the kink energy of ∼100 meV observed for the IP band cannot be explained without the contribution of the large SC gap of the IP band.…”

Low anisotropy of the upper critical field in a strongly anisotropic layered cuprateBi2.15Sr1.9CuO6+δ:Evidence for a paramagnetically limited superconductivity

“…However, in the studied low-T c superconductor the separation becomes trivial because, as shown in Ref. [30], all PG characteristics remain similar to high-T c materials, but all superconducting characteristics scale down with T c [11], leading to a large disparity of superconducting and PG characteristics. (c) doped crystal from the same batch (data from Ref.…”

“…The high T c in combination with a strong coupling leads to a large superconducting energy gap ∆ ∼ 20 − 50 meV [6][7][8][9][10][11] and H c2 (0) ∼ 10 2 T [12][13][14][15][16][17][18][19]. Such strong fields may alter the ground state of the material.…”