{"work":{"id":"8e8841f8-ae9b-4cf7-a1b3-44df10d94cc7","openalex_id":null,"doi":null,"arxiv_id":"cond-mat/9212030","raw_key":null,"title":"Gapless Spin-Fluid Ground State in a Random Quantum Heisenberg Magnet","authors":null,"authors_text":"S","year":1992,"venue":"cond-mat","abstract":"We examine the spin-$S$ quantum Heisenberg magnet with Gaussian-random, infinite-range exchange interactions. The quantum-disordered phase is accessed by generalizing to $SU(M)$ symmetry and studying the large $M$ limit. For large $S$ the ground state is a spin-glass, while quantum fluctuations produce a spin-fluid state for small $S$. The spin-fluid phase is found to be generically gapless - the average, zero temperature, local dynamic spin-susceptibility obeys $\\bar{\\chi} (\\omega ) \\sim \\log(1/|\\omega|) + i (\\pi/2) \\mbox{sgn} (\\omega)$ at low frequencies. This form is identical to the phenomenological `marginal' spectrum proposed by Varma {\\em et. al.\\/} for the doped cuprates.","external_url":"https://arxiv.org/abs/cond-mat/9212030","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-07T21:24:09.425643+00:00","pith_arxiv_id":"cond-mat/9212030","created_at":"2026-05-10T10:09:08.494921+00:00","updated_at":"2026-07-07T21:24:09.425643+00:00","title_quality_ok":true,"display_title":"Gapless Spin-Fluid Ground State in a Random Quantum Heisenberg Magnet","render_title":"Gapless Spin-Fluid Ground State in a Random Quantum Heisenberg Magnet"},"hub":{"state":{"work_id":"8e8841f8-ae9b-4cf7-a1b3-44df10d94cc7","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":42,"external_cited_by_count":null,"distinct_field_count":8,"first_pith_cited_at":"2019-05-21T17:27:30+00:00","last_pith_cited_at":"2026-07-06T16:04:54+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-08-23T16:19:37.281515+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":11}],"polarity_counts":[{"context_polarity":"background","n":11}],"runs":{},"summary":{},"graph":{},"authors":[]}}