HoB2C2 and TbB2C2 show anomalous magnetic phases which are adjacent to antiferroquadrupolar ordered phases and supposedly affected by multipolar interactions. We carried out specific heat and magnetization measurements to complete magnetic phase diagrams of pseudo-binary Ho1-xTbxB2C2. It is clarified that the interactions in the anomalous magnetic phases of HoB2C2 and TbB{2}C2 are quite similar and Tb3+ ions are cooperative to the antiferroquadrupolar order in HoB2C2.
PACS numbers: 75.50.Ee, 75.90.+w
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