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				The susceptibility and nuclear magnetic resonance measurements on quasi-one-dimensional spin-1 Heisenberg antiferromagnet LiVGe2O6 indicate that this material shows a phase transition from paramagnetic state to antiferromagnetic Nel state at about 22 K, and there exists a gap in the low-temperature magnetic excitation spectrum. Based on the model Hamiltonian of LiVGe2O6, we propose a low-energy field theoryGinzburg-Landau theory for this compound. From this theory, we study the finite-temperature phase transition induced by spontaneous symmetry breaking and then calculate the finite-temperature susceptibility of LiVGe2O6. All the theoretical calculations are consistent with the experimental results.[1] Haldane F D M 1983 Phys. Rev. Lett. 50 1153 [2] Haldane F D M 1983 Phys. Lett. 93A 464 [3] Buyers W J L, Morra R M, Armstrong R L, Hogan M J, Gerlach P, Hirakawa K 1986 Phys. Rev. Lett. 56 371 [4] Renard J P, Verdaguer M, Regnault L P, Erkelens W A C, Rossat-Mignod J, Stirling W G 1987 Europhys. Lett. 3 945 [5] Lu W, Shen X, Liu P, von Ortenberg M, Tuchendler J, Renard J P, Zheng F 1995 Chin. Phys. Lett. 12 313 [6] Mutka H, Soubeyroux J L, Bourleaux G, Colombet P 1989 Phys. Rev. B 39 4820 [7] Xu G, DiTusa J F, Ito T, Oka K, Takagi H, Broholm C, Aeppli G 1996 Phys. Rev. B 54 R6827 [8] Kong H Y, Zhang L, Song Y 2006 Acta Phys. Sin. 55 4865 (in Chinese) [孔红艳, 张林, 宋筠 2006 物理学报 55 4865] [9] Millet P, Mila F, Zhang F C, Mambrini M, Van Oosten A B, Pashchenko V A, Sulpice A, Stepanov A 1999 Phys. Rev. Lett. 83 4176 [10] Pedrini B, Wessel S, Gavilano J L, Ott H R, Kazakov S M, Karpinski J 2007 Eur. Phys. J. B 55 219 [11] Lumsden M D, Granroth G E, Mandrus D, Nagler S E, Thompson J R, Castellan J P, Gaulin B D 2000 Phys. Rev. B 62 R924 [12] Scalapino D J, Imry Y, Pinkus P 1975 Phys. Rev. B 11 2042 [13] Wang Z G, Ding G H, Xu B W 1999 Acta Phys. Sin. 48 296 (in Chinese) [王治国, 丁国辉, 许伯威 1999 物理学报 48 296] [14] Liu H L, Wang Z G, Yang C Q, Huang X S, Shi Y L 2007 Chin. Phys. 16 3858 [15] Wang Q B, Xu X F, Tao Q, Wang H T, Xu Z A 2008 Chin. Phys. B 17 3490 [16] Gavilano J L, Mushkolaj S, Ott H R, Millet P, Mila F 2000 Phys. Rev. Lett. 85 409 [17] Vonlanthen P, Tanaka K B, Goto A, Clark W G, Millet P, Henry J Y, Gavilano J L, Ott H R, Mila F, Berthier C, Horvatic M, Tokunaga Y, Kuhns P, Reyes A P, Moulton W G 2002 Phys. Rev. B 65 214413 [18] Affleck I 1989 J. Phys.: Condens. Matter 1 3047 [19] Takahashi M 1989 Phys. Rev. Lett. 62 2313 [20] Sorensen E S, Affleck I 1994 Phys. Rev. B 49 15771 [21] Sorensen E S, Affleck I 1993 Phys. Rev. Lett. 71 1633 [22] White S R 1992 Phys. Rev. Lett. 69 2863 [23] White S R 1993 Phys. Rev. B 48 10345 [24] White S R, Huse D A 1993 Phys. Rev. B 48 3844 [25] Affleck I 1989 Phys. Rev. Lett. 62 474 [26] Affleck I 1990 Phys. Rev. B 41 6697 [27] Coleman S 1973 Commun. Math. Phys. 31 259 [28] Coleman S 1975 Phys. Rev. D 11 2088 [29] Huang K 1992 Quarks, Leptons and Gauge Fields (2nd Ed.) (Singapore: World Scientific) Chapter 10 [30] Huang H, Affleck I 2004 Phys. Rev. B 69 184414 [31] Lou J, Xiang T, Su Z 2000 Phys. Rev. Lett. 85 2380 
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[1] Haldane F D M 1983 Phys. Rev. Lett. 50 1153 [2] Haldane F D M 1983 Phys. Lett. 93A 464 [3] Buyers W J L, Morra R M, Armstrong R L, Hogan M J, Gerlach P, Hirakawa K 1986 Phys. Rev. Lett. 56 371 [4] Renard J P, Verdaguer M, Regnault L P, Erkelens W A C, Rossat-Mignod J, Stirling W G 1987 Europhys. Lett. 3 945 [5] Lu W, Shen X, Liu P, von Ortenberg M, Tuchendler J, Renard J P, Zheng F 1995 Chin. Phys. Lett. 12 313 [6] Mutka H, Soubeyroux J L, Bourleaux G, Colombet P 1989 Phys. Rev. B 39 4820 [7] Xu G, DiTusa J F, Ito T, Oka K, Takagi H, Broholm C, Aeppli G 1996 Phys. Rev. B 54 R6827 [8] Kong H Y, Zhang L, Song Y 2006 Acta Phys. Sin. 55 4865 (in Chinese) [孔红艳, 张林, 宋筠 2006 物理学报 55 4865] [9] Millet P, Mila F, Zhang F C, Mambrini M, Van Oosten A B, Pashchenko V A, Sulpice A, Stepanov A 1999 Phys. Rev. Lett. 83 4176 [10] Pedrini B, Wessel S, Gavilano J L, Ott H R, Kazakov S M, Karpinski J 2007 Eur. Phys. J. B 55 219 [11] Lumsden M D, Granroth G E, Mandrus D, Nagler S E, Thompson J R, Castellan J P, Gaulin B D 2000 Phys. Rev. B 62 R924 [12] Scalapino D J, Imry Y, Pinkus P 1975 Phys. Rev. B 11 2042 [13] Wang Z G, Ding G H, Xu B W 1999 Acta Phys. Sin. 48 296 (in Chinese) [王治国, 丁国辉, 许伯威 1999 物理学报 48 296] [14] Liu H L, Wang Z G, Yang C Q, Huang X S, Shi Y L 2007 Chin. Phys. 16 3858 [15] Wang Q B, Xu X F, Tao Q, Wang H T, Xu Z A 2008 Chin. Phys. B 17 3490 [16] Gavilano J L, Mushkolaj S, Ott H R, Millet P, Mila F 2000 Phys. Rev. Lett. 85 409 [17] Vonlanthen P, Tanaka K B, Goto A, Clark W G, Millet P, Henry J Y, Gavilano J L, Ott H R, Mila F, Berthier C, Horvatic M, Tokunaga Y, Kuhns P, Reyes A P, Moulton W G 2002 Phys. Rev. B 65 214413 [18] Affleck I 1989 J. Phys.: Condens. Matter 1 3047 [19] Takahashi M 1989 Phys. Rev. Lett. 62 2313 [20] Sorensen E S, Affleck I 1994 Phys. Rev. B 49 15771 [21] Sorensen E S, Affleck I 1993 Phys. Rev. Lett. 71 1633 [22] White S R 1992 Phys. Rev. Lett. 69 2863 [23] White S R 1993 Phys. Rev. B 48 10345 [24] White S R, Huse D A 1993 Phys. Rev. B 48 3844 [25] Affleck I 1989 Phys. Rev. Lett. 62 474 [26] Affleck I 1990 Phys. Rev. B 41 6697 [27] Coleman S 1973 Commun. Math. Phys. 31 259 [28] Coleman S 1975 Phys. Rev. D 11 2088 [29] Huang K 1992 Quarks, Leptons and Gauge Fields (2nd Ed.) (Singapore: World Scientific) Chapter 10 [30] Huang H, Affleck I 2004 Phys. Rev. B 69 184414 [31] Lou J, Xiang T, Su Z 2000 Phys. Rev. Lett. 85 2380 
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