Electronic standing waves on the surface of Bi2Sr2CaCu2O8+δ

Vershinin, Michael; Misra, Shashank; Abe, Yasushi; Ono, Shimpei; Ando, Yoichi; Yazdani, Ali

doi:10.1016/j.physc.2004.03.082

Cited by 88 publications

(147 citation statements)

References 20 publications

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“…Our main finding is that the dispersive behavior vanishes in the normal state, as is consistent with experiment [6]. This is shown in Figs.…”

Section: Pacs Numberssupporting

confidence: 92%

“…It was argued that, within the superconducting phase, the temperature dependence of the nodal gap has finally provided [1] "a direct and unambiguous observation of a single particle gap tied to the superconducting transition". A complementary and equally valuable probe is scanning tunneling microscopy (STM) and the related quasi-particle interference (QPI) spectroscopy [3,4,5,6]. While this probe, like ARPES, is generally not phase sensitive, a controversy has arisen as to whether these techniques can, as argued experimentally [4,6], or cannot.…”

Section: Pacs Numbersmentioning

confidence: 99%

“…A complementary and equally valuable probe is scanning tunneling microscopy (STM) and the related quasi-particle interference (QPI) spectroscopy [3,4,5,6]. While this probe, like ARPES, is generally not phase sensitive, a controversy has arisen as to whether these techniques can, as argued experimentally [4,6], or cannot. as summarized theoretically [5,7] , distinguish coherent superconducting order from pseudogap behavior.…”

mentioning

confidence: 99%

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Quasiparticle interference in temperature dependent-STM as a probe of superconducting coherence

Wulin

Chien

et al. 2010

Physica C: Superconductivity and its Applications

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In this paper we explore the behavior of the quasi-particle interference pattern (QPI) of scanning tunneling microscopy as a function of temperature, T . After insuring a minimal consistency with photoemission, we find that the QPI pattern is profoundly sensitive to quasi-particle coherence and that it manifests two energy gap scales. The nearly dispersionless QPI pattern above Tc is consistent with data on moderately underdoped cuprates. To illustrate the important two energy scale physics we present predictions of the QPI-inferred energy gaps as a function of T for future experiments on moderately underdoped cuprates. PACS numbers:Recently, attention in the field of high temperature superconductivity has turned to characterizing the superconducting phase in the underdoped regime. This phase necessarily differs from that of a conventional d-wave superconductor because components of the gap smoothly evolve through T c . This leads to a normal state gap or pseudogap above T c . Owing to this fact, and unlike a BCS superconductor where the order parameter and the excitation gap are identical, there are very few ways to probe directly something as fundamental as the superconducting order parameter. Within the moderately underdoped samples, which we consider throughout this paper, recent angle resolved photoemission spectroscopy (ARPES) experiments have reported [1, 2] novel signatures of superconducting order. Fermi arcs around the d-wave nodes above T c rapidly collapse [2] at the transition to form point nodes. It was argued that, within the superconducting phase, the temperature dependence of the nodal gap has finally provided [1] "a direct and unambiguous observation of a single particle gap tied to the superconducting transition". A complementary and equally valuable probe is scanning tunneling microscopy (STM) and the related quasi-particle interference (QPI) spectroscopy [3,4,5,6]. While this probe, like ARPES, is generally not phase sensitive, a controversy has arisen as to whether these techniques can, as argued experimentally [4,6], or cannot. as summarized theoretically [5,7] , distinguish coherent superconducting order from pseudogap behavior.The objective of this Letter is to provide some resolution to this controversy by studying the temperature evolution of the QPI pattern observed in STM experiments from the superconducting ground state into the pseudogap phase at T T c . We employ a microscopically derived preformed pair theory [8] that accounts [9] for all of the complex momentum and temperature dependence of the ARPES spectral gap as described above. The QPI pattern is obtained using the Fourier transform of the local density of states (LDOS) associated with a single impurity. A central result of our study is that, once compatibility with ARPES experiments is incorporated, the observation of the so-called "octet model" QPI [10,11] superconducting order: sets of consistent octet model vectors can only be found for energies less than the superconducting order parameter energy scale. B-QPI does not...

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“…Our main finding is that the dispersive behavior vanishes in the normal state, as is consistent with experiment [6]. This is shown in Figs.…”

Section: Pacs Numberssupporting

confidence: 92%

Section: Pacs Numbersmentioning

confidence: 99%

mentioning

confidence: 99%

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Quasiparticle interference in temperature dependent-STM as a probe of superconducting coherence

Wulin

Chien

et al. 2010

Physica C: Superconductivity and its Applications

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“…It is disordered and possibly associated with the PG state. 67,93,94,[98][99][100] However, the exact relationship between the nanoscale electronic inhomogeneity and chemical disorder remains unresolved. In this section we summarize STM experiments on several cuprates (Bi-2212, Na-CCOC and YBCO) with bearing on the following controversy -is intrinsic electronic inhomogeneity in cuprates spontaneously arising (and pinned by chemical inhomogeneity), or is it directly caused by chemical inhomogeneity?…”

Section: Relationship Between Chemical Disorder and Electronic Inhomomentioning

confidence: 99%

“…1a). Furthermore, AOVs are found to lie primarily at the peaks of the ''checkerboard'' charge modulation (an order possibly associated with the PG state 94,[98][99][100]104 ) (Fig. 10g).…”

Section: Relationship Between Chemical Disorder and Electronic Inhomomentioning

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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Quasiparticle Interference Studies of Quantum Materials

et al. 2018

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Exotic electronic states are realized in novel quantum materials. This field is revolutionized by the topological classification of materials. Such compounds necessarily host unique states on their boundaries. Scanning tunneling microscopy studies of these surface states have provided a wealth of spectroscopic characterization, with the successful cooperation of ab initio calculations. The method of quasiparticle interference imaging proves to be particularly useful for probing the dispersion relation of the surface bands. Herein, how a variety of additional fundamental electronic properties can be probed via this method is reviewed. It is demonstrated how quasiparticle interference measurements entail mesoscopic size quantization and the electronic phase coherence in semiconducting nanowires; helical spin protection and energy-momentum fluctuations in a topological insulator; and the structure of the Bloch wave function and the relative insusceptibility of topological electronic states to surface potential in a topological Weyl semimetal.

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Electronic standing waves on the surface of Bi2Sr2CaCu2O8+δ

Cited by 88 publications

References 20 publications

Quasiparticle interference in temperature dependent-STM as a probe of superconducting coherence

Quasiparticle interference in temperature dependent-STM as a probe of superconducting coherence

Interplay of chemical disorder and electronic inhomogeneity in unconventional superconductors

Quasiparticle Interference Studies of Quantum Materials

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