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arxiv: 2606.13664 · v1 · pith:57SPM6V3new · submitted 2026-06-11 · ❄️ cond-mat.mtrl-sci

Morphology control and low-temperature magnetotransport in chiral 2D perovskite R-(MBA)₂PbI₄

Shehreen Aslam , Sam Saiter , Bradley Lloyd , Paul Kliewer , Matthew P. Hautzinger , Matthew C. Beard , Meenakshi Singh This is my paper

Pith reviewed 2026-06-27 05:46 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords chiral perovskitesHall effectmagnetotransportthin-film morphologyp-type conduction2D perovskitesgrain boundariesspin selectivity
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The pith

Morphology engineering enables the first Hall measurements in chiral 2D perovskite R-(MBA)2PbI4, identifying p-type conduction.

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

Chiral hybrid perovskites such as R-(MBA)2PbI4 have been hard to characterize electrically because their in-plane resistance is too high for reliable lateral devices. The paper shows that deliberate control of thin-film morphology removes this barrier and permits stable Hall-bar structures. Dark-condition Hall measurements then become possible and establish p-type conduction together with a mobility of roughly 0.2 cm² V⁻¹ s⁻¹ and a sheet carrier density of about 3×10¹⁴ cm⁻². These quantities had not been accessible before in this materials class. The same devices also reveal that magnetoresistance is stronger along paths that cross grain boundaries.

Core claim

By engineering the thin-film morphology of R-(MBA)2PbI4, robust lateral Hall-bar devices can be fabricated, allowing the first unambiguous dark-condition Hall measurements that identify p-type conduction with mobility ∼0.2 cm² V⁻¹ s⁻¹ and carrier density ∼3×10¹⁴ cm⁻², while also showing morphology-dependent magnetoresistance at grain boundaries.

What carries the argument

Engineered thin-film morphology that produces uniform in-plane current paths in Hall-bar geometries.

If this is right

  • In-plane magnetotransport becomes feasible for studying chirality-induced spin selectivity.
  • Chiral perovskites can now be integrated into lateral spintronic device architectures.
  • Morphology must be treated as a primary variable when interpreting in-plane transport data in these films.
  • Parameters such as mobility and carrier density are now measurable benchmarks for material optimization.

Where Pith is reading between the lines

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

  • The same morphology-control strategy could be tested on other chiral 2D perovskites to extract their transport parameters.
  • Single-crystal versions of the same material might show weaker grain-boundary magnetoresistance, providing a direct test of the morphology dependence.
  • If the measured carrier density is dominated by surface or interface states rather than bulk doping, temperature-dependent Hall data could separate those contributions.

Load-bearing premise

The morphology produces uniform in-plane current paths free of dominant contact or grain-boundary artifacts that would invalidate the extracted Hall mobility and carrier density.

What would settle it

Repeating the Hall measurements on the same films but with contacts placed at different grain-boundary densities and obtaining carrier densities or signs that change systematically with contact position would falsify the claim that the reported values reflect intrinsic bulk conduction.

Figures

Figures reproduced from arXiv: 2606.13664 by Bradley Lloyd, Matthew C. Beard, Matthew P. Hautzinger, Meenakshi Singh, Paul Kliewer, Sam Saiter, Shehreen Aslam.

Figure 1
Figure 1. Figure 1: Spin-speed dependence of the morphology, structure, and electrical properties [PITH_FULL_IMAGE:figures/full_fig_p008_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: (a) Output characteristics of an R-(MBA)2PbI4 film spun at 1500 rpm, showing [PITH_FULL_IMAGE:figures/full_fig_p010_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: (a) Magnetoresistance (MR) measured in the three-terminal FET geometry at [PITH_FULL_IMAGE:figures/full_fig_p015_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Room-temperature Hall effect mea￾surements of R-(MBA)2PbI4 thin films in a Hall-bar geometry. The transverse voltage, Vxy, was measured between the V+ and V− contacts while sweeping the magnetic field from −3 T to 3 T. The measured Hall re￾sponse is consistent with p-type conduction. Inset: SEM image of a representative Hall￾bar device showing the measurement geome￾try. To suppress signals from these sourc… view at source ↗
Figure 5
Figure 5. Figure 5: (A) Micrograph of Au contact pads patterned on a SiO [PITH_FULL_IMAGE:figures/full_fig_p027_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: ln(R) plotted versus (a) T −1 , (b) T −1/2 , (c) T −1/3 , and (d) T −1/4 to compare Ar￾rhenius and variable-range hopping (VRH) transport models in the low-temperature regime. Linear fits (solid lines) were performed only over the lowest-temperature region, marked by vertical dashed lines, where VRH behavior would be expected to be most prominent. While VRH in low-dimensional semiconductors is typically as… view at source ↗
Figure 7
Figure 7. Figure 7: Raw Hall voltage Vxy versus magnetic field B for +I (left) and −I (right), shown without post-processing over −3 ≤ B ≤ 3 T. Blue circles denote sweep up and or￾ange squares denote sweep down. The traces exhibit the expected odd-in-field symmetry, Vxy(B) ≈ −Vxy(−B), with minimal sweep-direction hysteresis. Any small even-in-B back￾ground (e.g., contact misalignment or longitudinal pickup) is minor and is re… view at source ↗
read the original abstract

Two-dimensional chiral hybrid perovskites, such as R/S-(MBA)\textsubscript{2}PbI\textsubscript{4}, are leading candidates for realizing and studying chirality-dependent charge and spin transport. However, their prohibitive in-plane resistance has precluded the electrical characterization. Here, we overcome this bottleneck by engineering the thin-film morphology of the chiral perovskite $R\text{-(MBA)}_2\text{PbI}_4$, enabling the first robust lateral device integration. In Hall-bar geometries, we demonstrate Hall measurements under dark conditions, unambiguously identifying p-type conduction with a Hall mobility of $\sim 0.2 \text{cm}^2 \text{V}^{-1} \text{s}^{-1}$ and a carrier density of $\sim 3\times10^{14} \text{ cm}^{-2}$, parameters previously inaccessible in this class of materials. Furthermore, we observe enhanced magnetoresistance along transport paths crossing grain boundaries, highlighting the strong influence of morphology on in-plane transport. This work demonstrates in-plane magnetotransport, enabling future investigations of the fundamental mechanisms of chirality-induced spin selectivity (CISS) and accelerating the integration of chiral materials into functional spintronic devices.

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

1 major / 1 minor

Summary. The paper claims that by engineering the thin-film morphology of the chiral 2D perovskite R-(MBA)₂PbI₄, the prohibitive in-plane resistance is overcome, enabling the first robust lateral device integration. In Hall-bar geometries, Hall measurements under dark conditions unambiguously identify p-type conduction with a Hall mobility of ∼0.2 cm² V⁻¹ s⁻¹ and a carrier density of ∼3×10¹⁴ cm⁻². Enhanced magnetoresistance is observed along transport paths crossing grain boundaries, highlighting morphology's influence on in-plane transport and enabling future CISS studies.

Significance. If the extracted Hall parameters prove reliable, the work would be significant for providing the first in-plane magnetotransport characterization in this class of chiral perovskites, previously inaccessible due to high resistance. This directly supports investigations of chirality-induced spin selectivity and integration into spintronic devices. The morphology-control strategy itself represents a practical experimental advance for lateral device fabrication.

major comments (1)
  1. [Abstract] Abstract: The central claim of unambiguous p-type identification with specific μ_H ≈ 0.2 cm² V⁻¹ s⁻¹ and n_s ≈ 3×10¹⁴ cm⁻² rests on the assumption of uniform in-plane current paths. However, the abstract explicitly notes enhanced magnetoresistance along paths crossing grain boundaries, which indicates inhomogeneous current flow. This raises the risk that local potential fluctuations or boundary scattering distort the Hall voltage, invalidating the extracted parameters unless uniformity is demonstrated (e.g., via linear R_H vs. B, multi-terminal consistency, or position-independent contacts).
minor comments (1)
  1. [Abstract] The abstract reports approximate values without error bars or measurement conditions; the full manuscript should include these for the Hall data to allow assessment of precision.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their positive assessment of the significance of our morphology-control approach and the first in-plane Hall measurements in R-(MBA)₂PbI₄. We address the single major comment below.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central claim of unambiguous p-type identification with specific μ_H ≈ 0.2 cm² V⁻¹ s⁻¹ and n_s ≈ 3×10¹⁴ cm⁻² rests on the assumption of uniform in-plane current paths. However, the abstract explicitly notes enhanced magnetoresistance along paths crossing grain boundaries, which indicates inhomogeneous current flow. This raises the risk that local potential fluctuations or boundary scattering distort the Hall voltage, invalidating the extracted parameters unless uniformity is demonstrated (e.g., via linear R_H vs. B, multi-terminal consistency, or position-independent contacts).

    Authors: We agree that grain-boundary scattering can produce inhomogeneous current flow and that this must be considered when interpreting Hall data. In our Hall-bar devices the Hall resistance remains linear in B over the measured field range, the extracted carrier density is consistent with the measured sheet resistance, and the Hall voltage polarity is independent of contact position. These observations support that the sign of the Hall coefficient (p-type) is robust. However, we acknowledge that the absolute values of μ_H and n_s could be affected by local inhomogeneities. We will therefore revise the abstract to replace 'unambiguously identifying' with 'identifying' and add a brief qualification that the reported parameters are extracted under the assumption of uniform current paths, with supporting linearity data shown in the main text and SI. No new experiments are required. revision: partial

Circularity Check

0 steps flagged

No circularity: purely experimental Hall measurements with no derivations

full rationale

The paper is an experimental report on thin-film fabrication, device integration, and direct Hall-bar measurements under dark conditions. The reported p-type conduction, mobility (~0.2 cm² V⁻¹ s⁻¹), and carrier density (~3×10¹⁴ cm⁻²) are stated as direct outputs of measured voltages and currents in Hall-bar geometries. No equations, predictions, fitted parameters renamed as predictions, or self-citation chains are present in the provided text. The central claims do not reduce to inputs by construction; the work is self-contained against external benchmarks as a materials characterization study.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on the validity of standard Hall-effect analysis in polycrystalline thin films and the assumption that morphology engineering produces representative in-plane transport without unaccounted artifacts. No free parameters, ad-hoc axioms, or invented entities are introduced.

axioms (2)
  • standard math Standard Hall-effect relations apply to extract mobility and carrier density from measured voltages in the given geometry
    Invoked implicitly when reporting Hall mobility and carrier density from dark measurements
  • domain assumption The thin-film morphology produces continuous in-plane conduction paths suitable for lateral transport characterization
    Central to the claim that morphology control overcomes prohibitive resistance

pith-pipeline@v0.9.1-grok · 5778 in / 1322 out tokens · 16543 ms · 2026-06-27T05:46:16.655456+00:00 · methodology

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