Orbital mixture effect on the Fermi-surface–Tc correlation in the cuprate superconductors: Bilayer vs. single layer

Hirofumi Sakakibara; Katsuhiro Suzuki; Hidetomo Usui; Satoaki Miyao; Isao Maruyama; Koichi Kusakabe; Ryotaro Arita; Hideo Aoki; Kazuhiko Kuroki

doi:10.1103/PhysRevB.89.224505

Orbital mixture effect on the Fermi-surface–Tc correlation in the cuprate superconductors: Bilayer vs. single layer

Hirofumi Sakakibara, Katsuhiro Suzuki, Hidetomo Usui, Satoaki Miyao, Isao Maruyama, Koichi Kusakabe, Ryotaro Arita, Hideo Aoki, Kazuhiko Kuroki

DOI 10.1103/PhysRevB.89.224505 · Physical Review B

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Abstract

By constructing dx2−y2−dz2 two-orbital models from first principles, we have obtained a systematic correlation between the Fermi surface warping and theoretically evaluated Tc for various bilayer as well as single-layer cuprates. This reveals that a smaller mixture of the dz2 orbital component on the Fermi surface leads simultaneously to larger Fermi-surface warping and higher Tc. The theoretical correlation strikingly resembles a systematic plot for the experimentally observed Tc against the Fermi surface warping due to Pavarini et al. [Phys. Rev. Lett. 87, 047003 (2001)], and the present result unambiguously indicates that the dz2 mixture is one key factor that determines Tc in the cuprates.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pb2Sr2Cu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pb2Sr2YCu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
EuSr2NbCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown