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REVIEW 2 major objections 2 minor 33 references

Electric fields penetrate three-dimensional superconductors while superconductivity persists.

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2026-06-26 19:07 UTC pith:BSJHXDH4

load-bearing objection Claims a new electric-field-driven intermediate state in bulk 3D superconductors with simultaneous supercurrent and dissipation, but the data details will decide if it is artifact-free and truly novel. the 2 major comments →

arxiv 2606.18931 v1 pith:BSJHXDH4 submitted 2026-06-17 cond-mat.supr-con cond-mat.mes-hall

The electric-field-driven intermediate state of three-dimensional superconductors

Ion Cojocari , Enzo Andreani , Paola Verniere , Florian Pallier , Marc Gabay , Miguel Monteverde , Claire Marrache-Kikuchi , Shamashis Sengupta This is my paper
classification cond-mat.supr-con cond-mat.mes-hall
keywords superconductivityelectric fieldintermediate stateorder parameter fluctuationsdissipative transportthree-dimensional superconductorsnonclassical regimesupercurrent
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

The paper establishes that an electric field applied to pristine bulk three-dimensional superconductors produces an intermediate state. In this state electric fields enter the material and charge transport becomes dissipative, yet supercurrents and superconductivity continue. The regime is traced to electric-field-driven fluctuations of the superconducting order parameter rather than to sample defects. A reader would care because the state supplies a clean platform for studying charged quantum fluids that carry both supercurrent and dissipation far from equilibrium.

Core claim

We demonstrate the emergence of an intermediate state in which electric fields penetrate the system while superconductivity still persists. Our measurements reveal a nonclassical regime characterized by the simultaneous presence of supercurrent and dissipative charge transport. This state, realized in a pristine unpatterned three-dimensional system, arises from electric-field-driven order parameter fluctuations. It provides a platform to explore dissipative states of charged quantum fluids far from equilibrium.

What carries the argument

Electric-field-driven order parameter fluctuations that permit simultaneous supercurrent and dissipative charge transport inside an unpatterned three-dimensional superconductor.

Load-bearing premise

The observed coexistence of supercurrent and dissipation is produced by electric-field-driven order parameter fluctuations in a clean three-dimensional sample and not by contact effects, inhomogeneity, or other artifacts.

What would settle it

If the simultaneous supercurrent and dissipation vanish when contacts are altered or when the sample is intentionally patterned, or if the transport curves match predictions from inhomogeneity models instead of fluctuation models.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

  • Supercurrent and dissipative charge transport can coexist inside the same three-dimensional superconductor under an applied electric field.
  • The intermediate state appears in unpatterned bulk samples and does not require artificial inhomogeneity.
  • The state supplies a platform for exploring dissipative states of charged quantum fluids far from equilibrium.
  • Electric-field-driven order parameter fluctuations are sufficient to produce the nonclassical regime.

Where Pith is reading between the lines

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

  • Similar intermediate states might appear in other three-dimensional quantum fluids when driven by external fields.
  • The finding suggests that electric fields could be used to tune dissipation in superconducting devices without destroying the supercurrent.
  • Testing the regime in different three-dimensional materials would clarify how general the fluctuation mechanism is.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

2 major / 2 minor

Summary. The manuscript reports the experimental realization of an electric-field-driven intermediate state in pristine, unpatterned three-dimensional superconductors. In this state, electric fields penetrate the sample while superconductivity persists, manifested as the simultaneous presence of supercurrent and dissipative charge transport arising from electric-field-driven order parameter fluctuations.

Significance. If the central experimental claim is substantiated by the data, the work identifies a nonclassical regime in charged quantum fluids far from equilibrium and supplies a platform for exploring dissipative superconducting states without patterning or artificial inhomogeneity.

major comments (2)
  1. [Abstract, §2] Abstract and §2 (experimental methods): the central claim rests on measurements demonstrating simultaneous supercurrent and dissipative transport, yet the text supplies no raw data, error bars, sample dimensions, contact geometry, or exclusion criteria for artifacts; without these the support for the nonclassical regime cannot be evaluated.
  2. [§3] §3 (results): the assertion that the observed regime originates specifically from electric-field-driven order parameter fluctuations rather than contact effects or sample inhomogeneity requires quantitative comparison (e.g., field-penetration length versus coherence length or critical-current scaling); the provided description does not include such analysis or controls.
minor comments (2)
  1. Notation for the intermediate state is introduced without a compact symbol or equation; a defining relation (e.g., relating E-field threshold to order-parameter variance) would improve clarity.
  2. Figure captions should explicitly state the temperature, current density, and electric-field range for each panel to allow direct comparison with the text.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the detailed and constructive report. The comments highlight important gaps in experimental documentation and analysis that we will address in a revised manuscript. Below we respond point-by-point to the major comments.

read point-by-point responses

  1. Referee: [Abstract, §2] Abstract and §2 (experimental methods): the central claim rests on measurements demonstrating simultaneous supercurrent and dissipative transport, yet the text supplies no raw data, error bars, sample dimensions, contact geometry, or exclusion criteria for artifacts; without these the support for the nonclassical regime cannot be evaluated.

    Authors: We agree that the present manuscript version does not provide sufficient raw experimental details. In the revision we will expand §2 with representative raw voltage-current traces (including error bars from multiple sweeps), explicit sample dimensions and thickness, a description of the contact geometry and probe configuration, and the specific criteria and checks used to exclude artifacts such as Joule heating, contact resistance, and electromagnetic pickup. These additions will allow direct evaluation of the data supporting the claimed regime. revision: yes

  2. Referee: [§3] §3 (results): the assertion that the observed regime originates specifically from electric-field-driven order parameter fluctuations rather than contact effects or sample inhomogeneity requires quantitative comparison (e.g., field-penetration length versus coherence length or critical-current scaling); the provided description does not include such analysis or controls.

    Authors: We accept that the current text lacks the requested quantitative controls. The revised §3 will incorporate estimates of the electric-field penetration length (derived from applied bias and measured sample thickness) compared with the coherence length, together with scaling plots of critical current versus electric field. Additional control measurements on samples with varied contact placements will be added to address possible contact or inhomogeneity contributions. revision: yes

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper is an experimental report demonstrating an intermediate state via measurements of supercurrent and dissipative transport in a 3D superconductor. No derivation chain, predictions from first principles, fitted parameters renamed as predictions, or self-citation load-bearing steps are present. The central claim rests on observed data rather than any reduction to inputs by construction, making the analysis self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The central claim rests on experimental observation interpreted through the standard framework of superconducting order-parameter dynamics; no free parameters, ad-hoc axioms, or new invented entities are introduced in the abstract.

pith-pipeline@v0.9.1-grok · 5630 in / 1055 out tokens · 20736 ms · 2026-06-26T19:07:20.922196+00:00 · methodology

0 comments
read the original abstract

The coexistence of superconductivity and finite electric fields may enable access to intriguing forms of electronic states. We demonstrate the emergence of an intermediate state in which electric fields penetrate the system while superconductivity still persists. Our measurements reveal a nonclassical regime characterized by the simultaneous presence of supercurrent and dissipative charge transport. This state, realized in a pristine unpatterned three-dimensional system, arises from electric-field-driven order parameter fluctuations. It provides a platform to explore dissipative states of charged quantum fluids far from equilibrium.

Figures

Figures reproduced from arXiv: 2606.18931 by Claire Marrache-Kikuchi, Enzo Andreani, Florian Pallier, Ion Cojocari, Marc Gabay, Miguel Monteverde, Paola Verniere, Shamashis Sengupta.

Figure 1
Figure 1. Figure 1: c. This allows us to determine effective values of conductance (gef f ) and resistance (Ref f ) from the slope, representing a property of dissipative charge carri￾ers. gef f=R −1 ef f= dI dV . Unlike a usual metal, the straight lines do not extrapolate to pass through the origin. In￾stead, they have a finite intercept IS on the current-axis. The intercept IS can be interpreted as a current without a volta… view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. When an electric field penetrates into the super [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

discussion (0)

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Reference graph

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