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arxiv: 2605.02619 · v1 · submitted 2026-05-04 · ❄️ cond-mat.supr-con

Recognition: unknown

Interfacial charge-induced adsorption mode for electron pairing in high-temperature superconductors

Jiu Hui Wu , Hua Tian , Kejiang Zhou
Authors on Pith no claims yet

Pith reviewed 2026-05-08 02:54 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con
keywords high-temperature superconductivityYBCOelectron pairinginterfacial adsorptionCooper pairsd-wave symmetrysuperconducting gapcoherence length
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The pith

In YBCO superconductors electrons pair by sharing optimized interfacial structures and exchanging adsorption modes with valence-flexible oxygen ions.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper argues that high-temperature superconductivity in YBCO arises from a charge-regulated layer at interfaces where electrons couple to the valence-flexible states of oxygen ions under an adsorption potential. Electrons pair by jointly occupying an optimized interfacial arrangement and swapping between adsorption modes, which produces a strong attractive interaction and forms Cooper pairs. The authors derive the effective potential in detail, obtain a coupling constant of 43.4, show that d-wave symmetry follows from anisotropic adsorption forces, and calculate a superconducting gap near 17 meV together with a coherence length that matches measured values.

Core claim

The coupling of electrons and valence-flexible state of oxygen ions forms a charge-regulated interfacial layer induced by the adsorption potential, and electrons are paired by sharing the optimized interfacial structure and exchanging the adsorption mode, generating strong attraction to form Cooper pairs. The effective interaction potential between electrons is exactly derived, as well as the electron-adsorption-mode coupling strength, in which the adsorption coupling constant is up to 43.4. D-wave symmetry comes from the anisotropy of interfacial adsorption forces, the pseudo-energy gap behavior is explained, the coherence length from the one-dimensional Ginzburg-Landau equation matches the

What carries the argument

The interfacial charge-induced adsorption mode: a charge-regulated layer created by adsorption potential at oxygen-ion interfaces that lets electrons share structures and exchange modes to generate attraction.

If this is right

  • The adsorption coupling constant reaches 43.4, producing strong electron attraction.
  • Anisotropy of the interfacial adsorption forces accounts for d-wave symmetry.
  • The same mode-exchange process explains the observed pseudo-gap behavior.
  • Coherence length obtained from the one-dimensional Ginzburg-Landau equation matches literature values.
  • The energy-gap equation yields a superconducting gap of approximately 17 meV, close to STM measurements.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the interfacial adsorption mechanism holds, similar charge-regulated layers could be engineered at other cuprate interfaces to raise transition temperatures.
  • The high coupling constant suggests the pairing interaction is relatively insensitive to small changes in oxygen valence or interface disorder.
  • Testing the model would require interface-specific probes such as scanning tunneling microscopy focused on oxygen-ion dynamics rather than bulk phonon spectra.

Load-bearing premise

Valence-flexible oxygen ions and adsorption potentials at interfaces create a charge-regulated layer whose mode-sharing and exchange dynamics produce the derived attractive interaction potential and pairing.

What would settle it

Direct measurement or first-principles calculation showing that no charge-regulated interfacial layer with the predicted adsorption-mode exchange exists in YBCO, or that the resulting gap is far from 17 meV, would falsify the mechanism.

read the original abstract

The electron pairing mechanism by the interfacial charge-induced adsorption mode of high-temperature superconductors is revealed. For the YBCO superconductors, the coupling of electrons and valence-flexible state of oxygen ions forms a charge-regulated interfacial layer induced by the adsorption potential, and electrons are paired by sharing the optimized interfacial structure and exchanging the adsorption mode, generating strong attraction to form Cooper pairs. Then the effective interaction potential between electrons is exactly derived in details, as well as the electron-adsorption-mode coupling strength, in which the adsorption coupling constant is up to 43.4. Furthermore, we verify that d-wave come from the anisotropy of interfacial adsorption forces, and explain the pseudo-energy gap behavior. By using the one-dimensional Ginzburg-Landau equation in the absence of a magnetic field, we obtain the coherence length expression, and the coherence length calculated is very close to the literature results. By establishing the energy gap equation, we obtain the superconducting gap , which is very close to the measured result of 17meV by Scanning Tunneling Microscopy/Spectroscopy. These quantitative predictions close to the known results could verify our theoretical framework.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript proposes that in YBCO high-temperature superconductors, electron pairing occurs through an interfacial charge-induced adsorption mode involving valence-flexible oxygen ions. Electrons share optimized interfacial structures and exchange adsorption modes to generate strong attraction for Cooper pairs. The effective interaction potential is derived, with an adsorption coupling constant reaching 43.4. D-wave symmetry arises from anisotropy of interfacial adsorption forces, the pseudogap is explained, coherence length is obtained from the 1D Ginzburg-Landau equation, and the superconducting gap is calculated to be close to the experimental 17 meV from STM.

Significance. Should the unshown derivations prove correct and the mechanism be microscopically grounded, this could represent a significant alternative explanation for pairing in cuprates, accounting for d-wave anisotropy, pseudogap, and quantitative matches to gap and coherence length. It would be notable for providing parameter values and predictions close to experiment. However, without the details, its significance cannot be fully assessed.

major comments (3)
  1. [Main text (derivation of effective potential)] The paper states that the effective interaction potential between electrons is exactly derived in details and the adsorption coupling constant is up to 43.4, but no explicit Hamiltonian, second-quantized operators, or step-by-step calculation is presented. This is central as all other results depend on it.
  2. [Gap calculation and comparison] The energy gap equation yields a value very close to 17 meV, but given that the coupling constant is calibrated to produce this match, it undermines the claim of independent verification of the theoretical framework.
  3. [Coherence length section] The coherence length from 1D Ginzburg-Landau is said to be very close to literature results, but without the explicit expression or how the adsorption mode enters the GL equation, the calculation cannot be reproduced or validated.
minor comments (2)
  1. Some sentences in the abstract are grammatically incomplete or awkward, e.g., the description of the superconducting gap.
  2. The manuscript would benefit from defining all symbols used in the gap equation and GL equation explicitly.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive and detailed comments, which highlight areas where greater transparency will strengthen the manuscript. We address each major comment below and will revise the paper to include the requested derivations and clarifications.

read point-by-point responses

  1. Referee: [Main text (derivation of effective potential)] The paper states that the effective interaction potential between electrons is exactly derived in details and the adsorption coupling constant is up to 43.4, but no explicit Hamiltonian, second-quantized operators, or step-by-step calculation is presented. This is central as all other results depend on it.

    Authors: We agree that the absence of the explicit step-by-step derivation, Hamiltonian, and second-quantized operators in the main text hinders verification. Although the effective potential is obtained from the interfacial charge-induced adsorption model of valence-flexible oxygen ions, the full algebraic details were condensed. In the revised manuscript we will expand this section (or add a supplementary derivation) to present the Hamiltonian, operators, and calculation of the coupling constant 43.4 in full. revision: yes

  2. Referee: [Gap calculation and comparison] The energy gap equation yields a value very close to 17 meV, but given that the coupling constant is calibrated to produce this match, it undermines the claim of independent verification of the theoretical framework.

    Authors: The coupling constant 43.4 is not an adjustable fit parameter but is obtained directly from the derived effective interaction potential using the physical parameters of the YBCO interfacial adsorption modes. The gap equation is then solved with this fixed value, yielding a result close to the STM measurement as a consistency check. We acknowledge that the condensed presentation may give the impression of calibration; the revised text will explicitly trace the origin of 43.4 from the model to demonstrate that the gap agreement is a prediction rather than an input. revision: partial

  3. Referee: [Coherence length section] The coherence length from 1D Ginzburg-Landau is said to be very close to literature results, but without the explicit expression or how the adsorption mode enters the GL equation, the calculation cannot be reproduced or validated.

    Authors: We agree that the coherence-length derivation requires more explicit detail. The one-dimensional Ginzburg-Landau equation is constructed from the effective electron-electron interaction that arises from the adsorption-mode exchange; the adsorption parameters enter through the coefficient of the quartic term and the gradient term. In the revision we will write out the explicit coherence-length expression and show the substitution of the adsorption-mode quantities so that the numerical result can be reproduced. revision: yes

Circularity Check

1 steps flagged

Coupling constant presented as 'exactly derived' but used to reproduce experimental gap value

specific steps
  1. fitted input called prediction [Abstract]
    "the effective interaction potential between electrons is exactly derived in details, as well as the electron-adsorption-mode coupling strength, in which the adsorption coupling constant is up to 43.4. ... By establishing the energy gap equation, we obtain the superconducting gap , which is very close to the measured result of 17meV by Scanning Tunneling Microscopy/Spectroscopy. These quantitative predictions close to the known results could verify our theoretical framework."

    The coupling constant is introduced as derived from the adsorption-mode mechanism, yet the subsequent gap equation is solved to a value stated to be very close to experiment, and the framework is validated by that closeness. This reduces the 'prediction' to a fit of the input data (experimental gap) by construction, as the constant 43.4 is the adjustable element that produces the match.

full rationale

The paper asserts that the effective interaction potential and adsorption coupling constant (43.4) are exactly derived from the interfacial adsorption-mode exchange mechanism. It then establishes an energy gap equation whose output is reported as very close to the experimental 17 meV value, with the overall framework verified by this numerical agreement and similar closeness for coherence length. This structure matches the fitted-input-called-prediction pattern: a parameter is introduced via the claimed derivation and immediately employed to recover a closely related experimental observable, rendering the 'prediction' statistically forced rather than independent. No explicit Hamiltonian or step-by-step reduction from first principles is quoted in the available text that would allow verification of independence. The central claim therefore contains partial circularity, but the remainder of the narrative (d-wave anisotropy from adsorption forces, pseudo-gap explanation) is not shown to reduce by construction.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 2 invented entities

The central claim rests on an ad-hoc interfacial adsorption mechanism, a fitted coupling constant, and standard superconductivity equations applied without independent microscopic justification; multiple invented entities and assumptions are introduced to achieve experimental agreement.

free parameters (1)
  • adsorption coupling constant = 43.4
    Stated as derived from the model but numerically set to 43.4 to produce gap values matching experiment.
axioms (2)
  • ad hoc to paper Electrons pair by sharing the optimized interfacial structure and exchanging the adsorption mode under the adsorption potential
    Core mechanism of the proposed pairing interaction, invoked without derivation from quantum mechanics.
  • standard math The one-dimensional Ginzburg-Landau equation applies in the absence of a magnetic field to obtain coherence length
    Standard phenomenological equation from superconductivity theory, applied here to the new model.
invented entities (2)
  • charge-regulated interfacial layer no independent evidence
    purpose: Mediates electron pairing via adsorption potential and oxygen ion valence flexibility
    Postulated structure introduced to enable the mode-sharing attraction mechanism.
  • adsorption mode no independent evidence
    purpose: Provides the exchangeable state for electron pairing and strong attraction
    New dynamical concept central to generating the Cooper pair interaction.

pith-pipeline@v0.9.0 · 5500 in / 1974 out tokens · 112358 ms · 2026-05-08T02:54:43.832042+00:00 · methodology

discussion (0)

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Reference graph

Works this paper leans on

2 extracted references · 1 canonical work pages

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