Coexistence of charged stripes and superconductivity in Bi2Sr2CaCu2O8+d
arXiv:cond-mat/0201546
Abstract
One of the most important outstanding problems in condensed matter physics is determination the ground state of strongly correlated electron system, in particular high-temperature superconductors (HTSC). For these materials, theoretical1-6 and experimental7-13 evidence has been mounting in support of the possibility that their ground state exhibits spin and charge density waves (SDW and CDW), which are primarily one-dimensional (i.e. stripes) and which either compete with or promote superconductivity. Coexistence of CDW or SDW and superconductivity has previously been reported in the lower Tc materials7-9,12,13 and in the presence of large magnetic fields10,11. The absence of data showing stripes in the higher Tc materials in zero field has lent support to the idea that stripes are competing with high temperature superconductivity. However, here we show, using scanning tunneling spectroscopy (STS), the existence of static striped density of electronic states in nearly optimally doped Bi2Sr2CaCu2O8+d in zero field. This modulation is aligned with the Cu-O bonds, with a periodicity of four lattice constants, and exhibits features characteristic of a two-dimensional system of line objects. We further show that the density of states modulation manifests itself as a shift of states from above to below the superconducting gap. The fact that a single energy scale (i. e., the gap) appears for both superconductivity and stripes suggests that these two effects have the same origin.
arXiv comment16 pages, 4 figures (included). Revised version of original manuscript: typographical errors corrected, references added, scales added to some figures, and some passages clarified
References in corpus (15)
- A Four-Unit-Cell Periodic Pattern of Quasiparticle States Surrounding Vortex Cores in Bi2Sr2CaCu2O8+d
- Discovery of microscopic electronic inhomogeneity in the high-Tc superconductor Bi2Sr2CaCu2O8+x
- Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+x
- Coexistence of, and Competition between, Superconductivity and Charge-Stripe Order in La(1.6-x)Nd(0.4)Sr(x)CuO(4)
- Singular quasiparticle scattering in the proximity of charge instabilities
- Stripe phases in high-temperature superconductors
- Spins in the Vortices of a High Temperature Superconductor
- STM Studies of the Electronic Structure of Vortex Cores in Bi2Sr2CaCu2O8+d
- Spin ordering quantum transitions of superconductors in a magnetic field
- Inherent Inhomogeneities in Tunneling Spectra of BSCCO Crystals in the Superconducting State
- Energetics of Domain Walls in the 2D t-J model
- d-wave superconductivity near charge instabilities
- Enhancement of long-range magnetic order by magnetic field in superconducting La2CuO(4+y)
- Dual Nature of the Electronic Structure of the Stripe Phase
- Thermodynamics of the interplay between magnetism and high-temperature superconductivity