{'fraction_non_alphanumeric': 0.05448717948717949, 'fraction_numerical': 0.02403846153846154, 'mean_word_length': 5.720430107526882, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Two-step neutral-ionic phase transition in organic charge-transfer compounds: Possible staging effect.

A two-step neutral-ionic transition has been discovered in a 1:1 mixed-stack charge-transfer crystal, (3,3',5,5') tetramethylbenzidine-(7,7,8,8) tetracyanoquinodimethane (TMB-TCNQ) under pressure. The fraction of ionized molecules changes discontinuously at two critical pressures, P 1 ∼6 and P 2 ∼20 kbar, demonstrating a characteristic feature of a staging phenomena. This result is interpreted in terms of a frustration effect of Coulomb interactions in the crystal, as predicted theoretically by Hubbard and Torrance