Highly metallic compounds with a quasi-one-dimensional structure, the new ternary compounds Ln Al Si (Ln=Ho, Er, Tm) are synthesized in molten aluminum from lanthanoid and silicon as reagents. Their structures show a formally [Al Si ] framework that contains infinite Al zigzag chains and Si-Si dimers and accommodates rows of Ln ions in parallel tunnels. The compounds exhibit metamagnetic transitions at high magnetic fields.
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