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The objective of the present work was to analyze the possibility ofrealization of quantum spin liquid in three volcanic minerals - averievite(Cu5O2(VO4)2(CuCl)), ilinskite (NaCu5O2(SeO3)2Cl3), and avdononite(K2Cu5Cl8(OH)4 2H2O - from the crystal chemistry point of view. Based on thestructural data, the sign and strength of magnetic interactions have beencalculated and the geometric frustrations serving as the main reason of theexistence of spin liquids have been investigated. According to ourcalculations, the magnetic structures of averievite and ilinskite are composedof antiferromagnetic (AFM) spin-frustrated layers of corner-sharing Cu4tetrahedra on the kagome lattice. However, the direction of nonshared cornersof tetrahedra is different in them. The oxygen ions centering the OCu4tetrahedra in averievite and ilinskite provide the main contribution to theformation of AFM interactions along the tetrahedra edges. The local electricpolarization in averievite and the possibility of spin configurationfluctuations due to vibrations of tetrahedra-centering oxygen ions have beendiscussed. The existence of structural phase transitions accompanied withmagnetic transitions was assumed in ilinskite because of the effect of a loneelectron pair by Se4+ ions. As was demonstrated through comparison ofaverievite and avdoninite, at the removal of centering oxygen ions fromtetrahedra, the magnetic structure of the pyrochlore layer present inaverievite transformed into an openwork curled net with large cells woven fromcorner-sharing open AFM spin-frustrated tetrahedra ('butterflies'} inavdoninite.

journal of physics. condensed matter

Antiferromagnetic spin-frustrated layers of corner-sharing Cu4  tetrahedra on the kagome lattice in volcanic minerals Cu5O2(VO4)2(CuCl),  NaCu5O2(SeO3)2Cl3, and K2Cu5Cl8(OH)4 2H2O