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The polycrystal samples of Ho2-xTbxTi2O7（x=0，05，1，15，2） were prepared by solid reaction method. The result of X-ray diffraction （XRD） and dc susceptibility measurement from 2 K to 300 K both indicate that as the content of Tb3+，i.e. x，increases，the system crosses over from Ho2Ti2O7spin ice to Tb2Ti2O7 spin liquid，the lattice constant of cubic pyrochlore increases，while the Curie constant and effective magnetic moment decrease. Especially，the Curie-Weiss temperature decreases from positive to negative with the decrease of x，implying the transition from ferromagnetic Ho2Ti2O7 to anti-ferromagnetic Tb2Ti2O7. The detailed analysis shows that as x in Ho2-xTbxTi2O7 increases，the intensity of long-range dipolar interaction Dnn decreases. Being ferromagnetic or anti-ferromagnetic，and the change in intensity of long-range dipolar interaction, may be the two crucial factors influencing on the system to form spin ice state or cooperative paramagnetic state，i.e. the spin liquid state.
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Keywords:
- spin ice /
- spin liquid /
- spin frustration /
- crystal structure
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[20] ］Kao Y J，Enjalran M，Maestro A D et al 2003 Phys. Rev. B 68 172407
[1] ［1］Canal B，Lacrox C 1998 Phys. Rev. Lett. 80 2933
[2] ［2］Lecheminant P，Bernu B，Lhuillier C 1997 Phys. Rev. B 56 2521
[3] ［3］Mila F 1998 Phys. Rev. B 81 2356
[4] ［4］Shi J，Tang Z，Zhu B P 2007 J. Magnetism and Magnetic Materials 310 1322
[5] ［5］Snyder J，Slusky J S，Cava R J，Schiffer P 2001 Nature 413 48
[6] ［6］Harris M J，Bramwell S T，McMorrow D F et al 1997 Phys. Rev. Lett. 79 2554
[7] ［7］Gingras M J P，den Hertog B C，Faucher M et al 2000 Phys. Rev. B 62 6496
[8] ［8］Gardner J S，Dunsiger S R，Gaulin B D et al 1999 Phys. Rev. Lett. 82 1012
[9] ［9］Tang Z，Li C Z，Yin D et al 2006 Acta Phys. Sin. 55 6532 （in Chinese）［汤征、李长征、尹镝等 2006 物理学报 55 6532］
[10] ］Cao H B，He L H，Wang F W，Zhang P L 2008 Chin. Phys. B 17 4323
[11] ］Wang L L，Xiong R，Wei W et al 2008 Acta Phys. Sin. 57 4334（in Chinese）［汪丽莉、熊锐、魏伟等 2008 物理学报 57 4334
[12] ］Matsuhira K，Hinatsu Y，Tenya K，Sakakibata T 2000 J. Phys.：Condes. Matter 12 649
[13] ］Zhao L H，Tian Z D，Tang Z et al 2007 Wuhan Universtity Journal of Natural and Science 12 1039
[14] ］Chang L J，Terashita H，Schweika W et al 2007 J. Magnetism and Magnetic Materials 310 1293
[15] ］Bramwell S T，Field M N，Harris M J，Parkin I P 2000 J. Phys.：Condens. Matter 12 483
[16] ］Den Hertog B C，Gingras M J P 2000 Phys. Rev. Lett. 84 3430
[17] ］Bramwell S T，Gingeras M J P 2001 Science 294 1495
[18] ］Bron M 1968 Dynamics of Crystal Lattice （Oxford Univ. Press，New York）
[19] ］Bramwell S T，Harris M J，den Hertog B C et al 2001 Phys. Rev. Lett. 84 047205
[20] ］Kao Y J，Enjalran M，Maestro A D et al 2003 Phys. Rev. B 68 172407
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