Quasiparticle Spectra around a Single Vortex in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">d</mml:mi></mml:math>-Wave Superconductor

Morita, Yoshifumi; Kohmoto, Mahito; Maki, Kazumi

doi:10.1103/physrevlett.78.4841

Cited by 67 publications

(44 citation statements)

References 22 publications

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“…It has been demonstrated that, in cuprate superconductors, the quasi-particle DOS in a vortex core shows a suppression and two low-energy subgap peaks (or kinks) near the Fermi energy 10-14 . These results, distinct from the theoretical predictions for a superconductor with either s-wave [4][5][6][7] or d-wave [15][16][17][18] pairing symmetry, are still not well understood, but suggest that the ground state of the cuprate superconductors may be gapped, manifesting an unconventional feature of the "normal state". Recently, a new family of HTSCs, iron-based superconductors (iron pnictides), was discovered 19 .…”

contrasting

confidence: 47%

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

Shan¹,

Wang²,

Shen³

et al. 2011

Nature Phys

124

108

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For a type-II superconductor, when the applied magnetic field is higher than the lower critical value H c1 , the magnetic flux will penetrate into the superconductor and form quantized vortices, which usually are arranged in an Abrikosov lattice. For the newly discovered iron pnictide superconductors, previous measurements have shown that, in electron-doped BaFe 2 As 2 , the vortices form a highly disordered structure 1-3 . In addition, the density of states (DOS) within the vortex cores 1 do not exhibit the Andreev bound states in conventional superconductors 4 -8 . In this Letter, we report the observation of a triangular vortex lattice and the Andreev bound states in hole-doped BaFe 2 As 2 by using a low temperature scanning tunneling microscope (STM). Detailed study of the vortex cores reveals that the spectrum of the Andreev bound states inside the vortex core exhibits a distinct spatial evolution: at the center of the vortex core, it appears as a single peak at 0.5 mV below the Fermi-energy; away from the core center, it gradually evolves into two sub-peaks and they eventually fade out. The drastic differences between the vortex cores of the electron-doped and hole-doped counterparts are illusive to the pairing mechanism of the iron pnictide superconductors.Magnetic flux quantization is one of the important quantum phenomena in the mixed

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contrasting

confidence: 47%

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

Shan¹,

Wang²,

Shen³

et al. 2011

Nature Phys

124

108

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“…This, we believe, indicates the failure of the quasiclassical approximation used in these theoretical analysis. Indeed, recent studies [11,12] of the Bogoliubov-de Gennes (BdG) equation clearly indicate not only the breakdown of the quasi-classical approximation for YBCO, but also the presence of the extended states with small energies (say |E| < 0.1∆) which exhibits clearly the fourfold symmetry anticipated from the square vortex lattice.…”

Section: Introductionmentioning

confidence: 99%

Vortex lattice transition ind-wave superconductors

1999

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Making use of the extended Ginzburg Landau theory, which includes the fourth order derivative term, we study the vortex state in a magnetic field parallel to the c axis. The vortex core structure is distorted due to this higher order term, which reveals the fourfold symmetry. Further, this distortion gives rise to the core interaction energy, which favors a square lattice tilted by 45 • from the a axis. The critical field of this transition is determined. The magnetization diverges at the transition. This suggests the transition is of the first order.

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“…In order to extract useful information regarding the underlying ground state from such measurements a detailed understanding of the vortex core physics is necessary. So far the problem has been addressed using the weak coupling approach based on the Bogoliubov-de Gennes theory generalized to the d-wave symmetry of the order parameter [7][8][9][10], and semiclassical calculations [11][12][13]. The early theoretical debate focused on the existence or absence of the vortex core bound states [12,14,15].…”

Section: Introductionmentioning

confidence: 99%

“…So far the problem has been addressed using the weak coupling approach based on the Bogoliubov-de Gennes theory generalized to the d-wave symmetry of the order parameter [7][8][9][10], and semiclassical calculations [11][12][13]. The early theoretical debate focused on the existence or absence of the vortex core bound states [12,14,15]. This debate, now resolved in favor of absence of any bound states in pure d x − y 2 state [9,10,16], has somewhat eclipsed the possibly more important issues related to the nature of the ground state in cuprates.…”

Section: Introductionmentioning

confidence: 99%

Vortex state in a doped Mott insulator

Franz

Tešanović

2001

Phys. Rev. B

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We analyze the recent vortex core spectroscopy data on cuprate superconductors and discuss what can be learned from them about the nature of the ground state in these compounds. We argue that the data are inconsistent with the assumption of a simple metallic ground state and exhibit characteristics of a doped Mott insulator. A theory of the vortex core in such a doped Mott insulator is developed based on the U(1) gauge field slave boson model. In the limit of vanishing gauge field stiffness such theory predicts two types of singly quantized vortices: an insulating "holon" vortex in the underdoped and metallic "spinon" vortex in the overdoped region of the phase diagram. We argue that the holon vortex exhibits a pseudogap excitation spectrum in its core qualitatively consistent with the existing experimental data on Bi2Sr2CaCu2O8. As a test of this theory we propose that spinon vortex with metallic core might be observed in the heavily overdoped samples.

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Quasiparticle Spectra around a Single Vortex in ad-Wave Superconductor

Cited by 67 publications

References 22 publications

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

Observation of ordered vortices with Andreev bound states in Ba0.6K0.4Fe2As2

Vortex lattice transition ind-wave superconductors

Vortex state in a doped Mott insulator

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