{"id":"dfd94275-a499-4d93-99ad-350ab4b66422","arxiv_id":"2606.00409","paper_version":1,"verdict":"UNVERDICTED","confidence":"LOW","novelty_score":4.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":0,"one_line_summary":"High-throughput computational workflow identifies 36 altermagnets and 11 Luttinger-compensated ferrimagnets, 31 of them new, from a broad magnets database.","lead":"This paper screens 37,163 magnets from the Materials Project database down to 189 collinear antiferromagnets using prescreening, exchange calculations, and Luttinger-Tisza analysis, then flags 36 altermagnets and 11 LCFs including 31 previously unreported. A smart generalist might read it to see how large structural databases can be turned into shortlists of testable materials for spintronics that combine zero net magnetization with spin-split bands.","discovery_kind":"unclear","skeptic_critique":{"model":"grok-4.3","headline":"Accuracy of high-throughput exchange + Luttinger-Tisza pipeline in selecting the 189 collinear AFMs is the load-bearing step","rationale":"The reader's weakest_assumption is precisely the step whose failure would falsify the central numerical claim. Because the full text was not examined in the initial review, the UNVERDICTED/LOW verdict already reflects this gap; the concrete test above would directly test whether that assumption holds.","tokens_in":1744,"tokens_out":361,"duration_ms":23079,"concrete_test":"Take the 10 compounds among the final 189 that have experimentally resolved magnetic structures in the literature; recompute their Heisenberg Jij matrix with the paper's exact DFT settings and Luttinger-Tisza procedure; check whether the predicted ordering vector and spin configuration match experiment. Mismatch on >2/10 cases indicates the screening step is unreliable at the claimed scale.","verdict_should_be":"UNCHANGED","load_bearing_attack":"The headline numbers (36 altermagnets, 11 LCFs) are obtained by applying symmetry analysis only to the 189 structures that survive the prescreening + high-throughput Jij calculations + Luttinger-Tisza ground-state search. Any systematic bias in the DFT-derived exchange parameters (functional, Hubbard U, k-point density, or supercell size) or in the classical Luttinger-Tisza assumption (e.g., missing biquadratic terms, failure to capture non-collinear minima) would directly alter which compounds are labeled collinear AFMs and therefore change the final counts. The abstract supplies no benchmark against known experimental structures, no sensitivity table on U or functional, and no error estimate on the 37163-to-189 reduction.","agreement_with_reader":"agree"},"referee_report":{"model":"grok-4.3","summary":"The manuscript describes a computational workflow that screens the Materials Project database of 37,163 magnets to identify 189 collinear antiferromagnets using physics-informed prescreening, high-throughput exchange calculations, and Luttinger-Tisza analysis. Symmetry analysis then classifies 36 of these as altermagnets and 11 as Luttinger-compensated ferrimagnets (LCFs), with 22 and 9 respectively claimed to be previously unreported. The work positions this as a scalable route for discovering unconventional antiferromagnets suitable for spintronics applications.","tokens_in":1882,"tokens_out":414,"duration_ms":14954,"significance":"If the pipeline is accurate, the approach offers a systematic, database-driven method to expand the known set of compensated spin-split magnets beyond case-by-case studies, potentially accelerating the identification of materials with nonrelativistic spin Hall effects and tunable spin transport. The provision of a curated list of candidates is a practical contribution.","major_comments":[{"comment":"Abstract: The reduction from 37,163 to 189 collinear antiferromagnets relies on high-throughput DFT exchange parameters and Luttinger-Tisza ground-state search, yet no benchmarks against experimentally known magnetic structures, no sensitivity tests on U values or functionals, and no error estimates are provided; this directly affects the reliability of the headline counts of 36 altermagnets and 11 LCFs.","section":"Abstract"},{"comment":"Abstract: The Luttinger-Tisza analysis assumes classical spins and may miss non-collinear minima or biquadratic interactions; without validation on known compounds, it is unclear whether the 189 structures are correctly classified as collinear antiferromagnets.","section":"Abstract"}],"minor_comments":[{"comment":"The abstract would benefit from a brief mention of the specific exchange-correlation functional and Hubbard U scheme used in the high-throughput calculations.","section":null}],"recommendation":"major_revision","confidential_remarks":null},"author_rebuttal":{"model":"grok-4.3","summary":"We thank the referee for their thorough review and constructive feedback on our manuscript. We address each of the major comments below and outline the revisions we will make to improve the clarity and reliability of our findings.","responses":[{"response":"We acknowledge the importance of validation for the high-throughput workflow. Our approach builds on established protocols from the Materials Project, where DFT+U parameters are standardized and have been benchmarked in prior literature for magnetic properties. The Luttinger-Tisza method has been applied successfully in several studies to predict collinear antiferromagnetic orders. To strengthen the manuscript, we will add a dedicated subsection on methodological validation, including references to experimental agreements in similar systems and a brief sensitivity analysis for a representative subset of compounds. This will provide better context for the reliability of the 189 collinear antiferromagnets identified.","revision_made":"yes","referee_comment":"[Abstract] Abstract: The reduction from 37,163 to 189 collinear antiferromagnets relies on high-throughput DFT exchange parameters and Luttinger-Tisza ground-state search, yet no benchmarks against experimentally known magnetic structures, no sensitivity tests on U values or functionals, and no error estimates are provided; this directly affects the reliability of the headline counts of 36 altermagnets and 11 LCFs."},{"response":"The focus of our study is on collinear antiferromagnets, for which the classical Luttinger-Tisza approximation is particularly suitable as it efficiently identifies the ground state among collinear configurations. Non-collinear effects and biquadratic terms are beyond the scope of this high-throughput screening but could be investigated in follow-up studies on promising candidates. We will revise the methods section to explicitly state these assumptions and include citations to works validating LT predictions against experiments for known collinear antiferromagnets, thereby supporting the classification.","revision_made":"yes","referee_comment":"[Abstract] Abstract: The Luttinger-Tisza analysis assumes classical spins and may miss non-collinear minima or biquadratic interactions; without validation on known compounds, it is unclear whether the 189 structures are correctly classified as collinear antiferromagnets."}],"tokens_in":1361,"tokens_out":472,"duration_ms":25341,"standing_objections":[]},"desk_editor":{"model":"grok-4.3","letter":"The main takeaway is that they found 22 previously unreported altermagnets and 9 new Luttinger-compensated ferrimagnets by screening the Materials Project. That's a useful shortlist for the spintronics community.\n\nWhat works is the scale: they started with over 37,000 magnets, applied prescreening plus high-throughput exchange calculations and Luttinger-Tisza to get down to 189 collinear antiferromagnets, then used symmetry to classify 36 altermagnets and 11 LCFs. The approach is a direct extension of existing high-throughput methods, and it produces concrete candidates that could show nonrelativistic spin Hall effects or doping-tunable transport.\n\nThe weak point is the lack of any check on whether the pipeline correctly identifies those 189 structures. The abstract mentions no comparison to experimentally known compounds, no sensitivity analysis on the DFT settings like Hubbard U or k-points, and no discussion of possible failures in the Luttinger-Tisza method for these materials. If the exchange parameters are off, the whole downstream count shifts. Without that, the claim that these are the right unconventional antiferromagnets rests on untested assumptions.\n\nThis is aimed at materials scientists and condensed matter physicists looking for new antiferromagnetic candidates rather than at people developing new theoretical frameworks. The workflow is reusable but not a conceptual advance.\n\nI would send it to peer review. The candidate list has potential value even if the numbers require more scrutiny in revision.","headline":"They identify 22 new altermagnets and 9 new LCFs through a database screen, but the accuracy of the 189-structure filter is unverified.","tokens_in":2413,"tokens_out":385,"would_cite":false,"duration_ms":18394,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"grok-4.3","headline":"A computational screen of 37,000 magnets identifies 36 altermagnets and 11 Luttinger-compensated ferrimagnets, 31 of them previously unknown.","keywords":["altermagnets","Luttinger-compensated ferrimagnets","collinear antiferromagnets","spintronics","high-throughput screening","symmetry analysis","magnetic ground states"],"falsifier":"Experimental measurement of magnetic order or spin-split bands without net magnetization in any one of the 31 newly predicted compounds would test the classification.","tokens_in":2620,"feed_emoji":"","tokens_out":683,"duration_ms":28025,"temperature":0.7,"pith_summary":"The paper sets out to convert a large structural database into a curated list of compensated magnets that combine zero net magnetization with spin-split bands. It applies physics-informed filters, high-throughput exchange calculations, and Luttinger-Tisza analysis to reduce 37,163 entries to 189 collinear antiferromagnets. Symmetry classification then flags 36 altermagnets and 11 Luttinger-compensated ferrimagnets. The resulting compounds are predicted to host nonrelativistic spin Hall effects and doping-tunable spin transport with switchable polarization.","feed_headline":"Screen finds 36 altermagnets and 11 Luttinger ferrimagnets","feed_subtitle":"Database narrows 37k magnets to 189 candidates; 31 compounds are new and predicted to show spin-split bands with zero net moment.","key_machinery":"The end-to-end screening pipeline that narrows a materials database to collinear antiferromagnets and applies symmetry analysis to classify them as altermagnets or Luttinger-compensated ferrimagnets.","core_discovery":"Symmetry analysis of 189 collinear antiferromagnets obtained via prescreening, exchange calculations and Luttinger-Tisza analysis yields 36 altermagnets and 11 Luttinger-compensated ferrimagnets, of which 22 altermagnets and 9 LCFs have not been reported before.","pith_inferences":["Extending the same filters to non-collinear or incommensurate structures could enlarge the candidate pool.","Machine-learning surrogates for the exchange calculations would reduce computational cost for even larger databases.","Device-level modeling of the predicted spin Hall and transport effects would quantify performance gains over conventional antiferromagnets.","Cross-checking the new candidates against independent magnetic-structure databases would provide an immediate consistency test."],"forward_implications":["The identified compounds can support nonrelativistic spin Hall effects.","Doping can produce switchable spin polarization and giant anisotropy in transport.","The same pipeline supplies a scalable route to additional compensated spin-split magnets beyond the current 189.","22 new altermagnets and 9 new LCFs become immediate targets for synthesis and measurement."],"fun_headline_variants":["37k magnets screened to 36 altermagnets and 11 LCFs","189 antiferromagnets yield 36 altermagnets and 11 LCFs","36 altermagnets and 11 LCFs from magnet screening","Database narrows to 36 altermagnets and 11 LCFs"],"cache_read_input_tokens":2112,"weakest_assumption_plain":"The combination of physics-informed prescreening, high-throughput exchange calculations, and Luttinger-Tisza analysis correctly resolves the magnetic ground states across the screened portion of the Materials Project database.","fun_headline_variants_meta":{"raw":{"variants":["37k magnets screened to 36 altermagnets and 11 LCFs","189 antiferromagnets yield 36 altermagnets and 11 LCFs","36 altermagnets and 11 LCFs from magnet screening","Database narrows to 36 altermagnets and 11 LCFs"]},"model":"grok-4.3","cost_usd":0.00829,"raw_usage":{"total_tokens":3749,"prompt_tokens":651,"num_sources_used":0,"completion_tokens":85,"cost_in_usd_ticks":82899500,"prompt_tokens_details":{"text_tokens":651,"audio_tokens":0,"image_tokens":0,"cached_tokens":256},"completion_tokens_details":{"audio_tokens":0,"reasoning_tokens":3013,"accepted_prediction_tokens":0,"rejected_prediction_tokens":0}},"tokens_in":651,"tokens_out":85,"duration_ms":21812,"temperature":1.0,"reasoning_tokens":3013,"cache_read_input_tokens":256,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-06-28T21:24:52.168327+00:00","model_set":{"reader":"grok-4.3"},"falsifier":"Experimental measurement of magnetic order or spin-split bands without net magnetization in any one of the 31 newly predicted compounds would test the classification.","supporting_citations":[],"review_version":1}