Theory of Scanning Tunneling Microscopy Probe of Impurity States in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi></mml:math>-Wave Superconductor

Salkola, M. I.; Balatsky, Alexander V.; Scalapino, D. J.

doi:10.1103/physrevlett.77.1841

Cited by 197 publications

(187 citation statements)

References 18 publications

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“…Some of this work has reached conclusions similar to those presented here, particularly with regard to the importance of carefully considering the real part of the Green's function in T-matrix calculations [18], [19].…”

Section: Introductionsupporting

confidence: 53%

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Bound states and impurity averaging in unconventional superconductors

Joynt

1997

J Low Temp Phys

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The question of anomalous transport due to a band of impurity states in unconventional superconductors is discussed. In general, the bound state energies are not in midgap, even in the unitarity limit. This implies that, generically, the states associated with impurities are broad resonances, not true bound states. There is no impurity band in the usual sense of the phrase.The wavefunctions of these resonances possess interesting anisotropies in real space, but this does not result in anomalous hopping between impurities.I conclude that the system of resonances produces no qualitative modifications to the T-matrix theory with impurity averaging which is normally used to treat the low-temperature transport of unconventional superconductors.However, users of this method often assume a density of states which is symmetric around the chemical potential. This is not normally the case. It is found that the non-crossing approximation is not valid in a strictly twodimensional system.

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Section: Introductionsupporting

confidence: 53%

“…This has already been pointed recently by other authors in the magnetic impurity case [18], [19]. This arises from the same source as in the semiconductor.…”

Section: A Introductionmentioning

confidence: 55%

Bound states and impurity averaging in unconventional superconductors

Joynt

1997

J Low Temp Phys

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“…A dominant resonance below the Fermi level usually indicates an attractive potential, while a dominant resonance above the Fermi level indicates a repulsive potential. 26 The family of Bi-based cuprates, first discovered in 1988, 35,36 boosted T c up to B110 K, and constituted the first generation of commercially produced high-T c cables. 37 Since adjacent BiO layers are weakly bonded by the van der Waals force, Bi-based cuprates typically cleave on a charge neutral plane between two BiO layers (see the example of the BiO surface in Fig.…”

Section: Single Atom Defects As Local Probesmentioning

confidence: 99%

Interplay of chemical disorder and electronic inhomogeneity in unconventional superconductors

Zeljkovic

Hoffman

2013

Phys. Chem. Chem. Phys.

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Many of today's forefront materials, such as high-T c superconductors, doped semiconductors, and colossal magnetoresistance materials, are structurally, chemically and/or electronically inhomogeneous at the nanoscale. Although inhomogeneity can degrade the utility of some materials, defects can also be advantageous. Quite generally, defects can serve as nanoscale probes and facilitate quasiparticle scattering used to extract otherwise inaccessible electronic properties. In superconductors, nonstoichiometric dopants are typically necessary to achieve a high transition temperature, while both structural and chemical defects are used to pin vortices and increase critical current. Scanning tunneling microscopy (STM) has proven to be an ideal technique for studying these processes at the atomic scale.In this perspective, we present an overview of STM studies on chemical disorder in unconventional superconductors, and discuss how dopants, impurities and adatoms may be used to probe, pin or enhance the intrinsic electronic properties of these materials.

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“…The most direct impurity probe of the superconducting state is provided by the scanning tunneling microscopy (STM) measurement of the local quasiparticle density of states (LDOS) around a single impurity. The STM images of Bi 2 Sr 2 CaCu 2 O 8+δ reveal a tetragonal symmetry representative for the d-wave state [1,2,3,4]. In addition to a possible identification of the superconducting state, this experiment may shed light on the nature of the quasiparticle scattering process -issue, which is important to the interpretation of the impurity pair-breaking effect in the d-wave superconductor.…”

Section: Introductionmentioning

confidence: 99%