ARPES study on electronic evolution in Ca2 xNaxCuO2Cl2
نویسندگان
چکیده
Electronic evolution from an antiferromagnetic insulator to a high-Tc superconductor is revealed by angle-resolved photoemission spectroscopy experiments on tetragonal Ca2 xNaxCuO2Cl2 single crystals, which were grown for the first time under high pressures (6 5.5 GPa). In an underdoped superconductor (x 1⁄4 0:1), we found clear fingerprints of the parent magnetic insulator: a shadow band and a large gap-like structure. The results are most likely described by a ‘‘chemical potential shift’’, which contrasts clearly with the ‘‘pinned chemical potential’’ reported for the prototype La2 xSrxCuO4, demonstrating that the route to a high-Tc superconductor is not unique. 2003 Elsevier Science B.V. All rights reserved.
منابع مشابه
Doping evolution of the electronic structure in the single-layer cuprates Bi2Sr2−xLaxCuO6+δ: Comparison with other single-layer cuprates
We have performed angle-resolved photoemission and core-level x-ray photoemission studies of the single-layer cuprate Bi2Sr2−xLaxCuO6+δ (Bi2201) and revealed the doping evolution of the electronic structure from the lightly-doped to optimally-doped regions. We have observed the formation of the dispersive quasi-particle band, evolution of the Fermi “arc” into the Fermi surface and the shift of ...
متن کاملFrom Mott insulator to overdoped superconductor: Evolution of the electronic structure of cuprates studied by ARPES
We review our angle-resolved photoemission spectroscopy (ARPES) results on different layered oxide superconductors, and on their insulating parent compounds. The low energy excitations are discussed with emphasis on some of the most recent issues, such as the Fermi surface and remnant Fermi surface, the pseudogap and d-wave-like dispersion, and lastly the signatures in the ARPES spectra of mult...
متن کاملNodal quasiparticles and antinodal charge ordering in Ca2-xNaxCuO2Cl2.
Understanding the role of competing states in the cuprates is essential for developing a theory for high-temperature superconductivity. We report angle-resolved photoemission spectroscopy experiments which probe the 4a0 x 4a0 charge-ordered state discovered by scanning tunneling microscopy in the lightly doped cuprate superconductor Ca2-xNaxCuO2Cl2. Our measurements reveal a marked dichotomy be...
متن کاملMissing quasiparticles and the chemical potential puzzle in the doping evolution of the cuprate superconductors.
The evolution of Ca2-xNaxCuO2Cl2 from Mott insulator to superconductor was studied using angle-resolved photoemission spectroscopy. By measuring both the excitations near the Fermi energy as well as nonbonding states, we tracked the doping dependence of the electronic structure and the chemical potential with unprecedented precision. Our work reveals failures in the standard weakly interacting ...
متن کاملAn Angle Resolved Photoemission Study of a Mott Insulator and Its Evolution to a High Temperature Superconductor*
One of the most remarkable facts about the high temperature superconductors is their close proximity to an antiferromagnetically ordered Mott insulating phase. This fact suggests that to understand superconductivity in the cuprates we must first understand the insulating regime. Due to material properties the technique of angle resolved photoemission is ideally suited to study the electronic st...
متن کامل