Evidence map›Paper›PMID 41057537›Full record

ArticleScientific reports2025

Unveiling excitonic insulator signatures in Ta[Formula: see text]NiSe[Formula: see text] through structural and orbital probes.

Nour Maraytta, Peter Nagel, Fatemeh Ghorbani, Amir Ghiami, Santanu Pakhira, Mai Ye, Björn Wehinger, Federico Abbruciati, Gaston Garbarino, Matthieu Le Tacon and 3 more

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

0 citing papers in PubMed.

No citing paper in PubMed yet.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors.

Nour MarayttaInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany. nour.maraytta@kit.edu.
Peter NagelInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Fatemeh GhorbaniInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Amir GhiamiInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Santanu PakhiraInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Mai YeInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Björn WehingerESRF, The European Synchrotron, 71, avenue des Martyrs, CS 40220, 38043, Grenoble Cedex 9, France.
Federico AbbruciatiESRF, The European Synchrotron, 71, avenue des Martyrs, CS 40220, 38043, Grenoble Cedex 9, France.
Gaston GarbarinoESRF, The European Synchrotron, 71, avenue des Martyrs, CS 40220, 38043, Grenoble Cedex 9, France.
Matthieu Le TaconInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Stefan SchupplerInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Amir-Abbas HaghighiradInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany.
Michael MerzInstitute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany. michael.merz@kit.edu.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The high-temperature phase of Ta[Formula: see text]NiSe[Formula: see text], a near-zero-gap semiconductor ([Formula: see text] = 0), is a promising candidate for an excitonic insulator. Given the dome-like evolution expected for an excitonic insulator around [Formula: see text], we investigated Ta[Formula: see text]NiSe[Formula: see text], the more semi-metallic Ta[Formula: see text](Ni,Co)Se[Formula: see text], and semiconducting Ta[Formula: see text]NiS[Formula: see text] using high-resolution single-crystal x-ray diffraction and near-edge x-ray absorption fine structure (NEXAFS). Our findings reveal a second-order structural phase transition from orthorhombic (space group: Cmcm) to monoclinic (space group: C2/c) in Ta[Formula: see text]NiSe[Formula: see text] and Ta[Formula: see text](Ni,Co)Se[Formula: see text], but no transition in Ta[Formula: see text]NiS[Formula: see text] down to 2 K. This transition breaks two mirror symmetries, enabling and enhancing the hybridization of Ta, Ni, and Se atoms, shortening bond lengths, and strengthening orbital interactions. NEXAFS data confirm stronger hybridization, significant changes in excitonic binding energies, and a key alteration in orbital character, suggesting an excitonic insulating state in Ta[Formula: see text]NiSe[Formula: see text] and emphasizing the crucial electronic role of orbitals in the formation of the excitonic insulator state.

Identifiers

PMID41057537
PMCPMC12504696

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.