Crystal field effects in the zig-zag chain compound SrTm2O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e831" altimg="si20.svg"><mml:msub><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:math>
Journal of magnetism and magnetic materials