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The weak ferromagnetic behavior arises from the size effects, which gives rise to the distortion of the T′-R2CuO4 structure. In this paper, we study magnetic properties on rare-earth cuprates, R2CuO4 (R=Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Tm), synthesized under high oxygen pressure (6 GPa) at elevated-temperature. The magnetic susceptibility measurements show a new weak-magnetic component near a characteristic temperature of 28 K. Appearances of the low temperature weak-magnetism are independent of the rare-earth components and are a common behavior of all oxygen-doped T′-R2CuO4 cuprates. We argue that (1) the weak ferromagnetic behavior occurred near 28 K couldn’t be attributed to the size effects, but to the formation of ferromagnetic clusters in CuO2 planes caused by the oxygen-doping under high pressure; (2) superconductivity and weak ferromagnetism seem to be exclusive in T′-R2CuO4 compounds, i.e., the ferromagnetic clusters in CuO2 planes seems to be incompatible with superconductivity in these system.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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