柴一晟

柴一晟，男，博士，重慶大學物理學院博士生導師。

基本介紹

• 中文名：柴一晟
• 畢業院校：中國科學技術大學
• 學位/學歷：博士
• 專業方向：單相與複合多鐵、磁電耦合行為等
• 職務：重慶大學物理學院博士生導師

研究方向

1.單相與複合多鐵、磁電耦合行為。

2.超導與強關聯繫統。

3.熱輸運測量、強磁場測量及其它磁性測量方法的發展。

人物經歷

2017-至今 教授，物理學院套用物理系，重慶大學

2012-2017副研究員，磁學室，中科院物理所

2004-2005訪問，丹麥Risoe國家實驗室

1995-2007本科、碩博聯讀，凝聚態物理，中國科學技術大學物理系

學術成果

主持及參與科研項目：

1、國家自然科學基金面上項目，六角鐵氧體中電偶極幾何阻挫系統的多場調控，2017/1-2020/12、67萬元，主持。

2、國家自然科學基金重點項目，新型多鐵性材料與磁電耦合原型器件研究，2016/1- 2020/12、305萬元，參與。

3、國家自然科學基金面上項目，多鐵性六角鐵氧體巨磁電耦合效應微觀機理研究、2014/1-2017/12、89萬元、主持。

4、中科院所級百人計畫啟動經費, 50萬，2012年。

發表SCI文章70多篇，引用800多次，H因子17,全部發表文章列表可在：

代表性論文

(1)Chai, YiSheng, Kwon, Sangil, Chun, SaeHwan, Kim, Ingyu, Jeon,ByungGu, Kim, KeeHoon, Lee, Soonchil, "Electrical control of large magnetization reversal in a helimagnet",Nature Communications, 5, 4208 (2014)

(2) Shen, Shi-Peng, Wu, Jia-Chuan, Song, Jun-Da, Sun, Xue-Feng, Yang, Yi-Feng,Chai, Yi-Sheng, Shang, Da-Shan, Wang, Shou-Guo, Scott, James F, Sun, Young, "Quantum electric-dipole liquid on a triangular lattice",Nature Communications, 7, 10569 (2016)

(3)K. Zhai, Y. Wu, S. Shen, W. Tian, H. Cao,Y. Chai, B. C. Chakoumakos, D. Shang, L. Yan, F. Wang, Y. Sun, Giant magnetoelectric effects achieved by tuning spin cone symmetry in Y-type hexaferrites.Nature Communications8, 519. (2017).

(4) Wang, Xiao,Chai, Yisheng,et al., "Observation of magnetoelectric multiferroicity in a cubic perovskite system: LaMn₃Cr₄O₁₂",Physical Review Letters,115, 087601 (2015)（共同第一作者）

(5) Chun, SaeHwan,Chai, YiSheng,et al., "Electric field control of nonvolatile four-state magnetization at room temperature",Physical Review Letters, 108, 177201 (2012) (通訊作者）

(6) Chun, SaeHwan,Chai, YiSheng,et al., "Realization of giant magnetoelectricity in helimagnets",Physical Review Letters, 104, 037204 (2010)

(7) Tian, Ying, Wang, Wei,Chai, Yisheng, Cong, Junzhuang, Shen, Shipeng, Yan, Liqin, Wang, Shouguo, Han, Xiufeng, Sun, Young, "Quantum tunneling of magnetization in a metal-organic framework",Physical Review Letters, 112, 017202 (2014)

(8)L. Zhou, J. Dai,Y. Chai,et al., “Realization of Large Electric Polarization and Strong Magnetoelectric Coupling in BiMn3Cr4O12”.Adv. Mater.29, 1703435 (2017).

(9) Shen, Jian-Xin; Shang, Da-Shan;Chai, Yi-Sheng; Wang, Shou-Guo; Shen, Bao-Gen; Sun, Young, “Mimicking Synaptic Plasticity and Neural Network Using Memtranstors”.Adv. Mater.30, 1706717 (2018).

(10)K. Zhai, D. S. Shang,Y. S. Chai, G. Li, J. W. Cai, B. G. Shen and Y. Sun, “Room-Temperature Nonvolatile Memory Based on a Single-Phase Multiferroic Hexaferrite”.Adv. Func. Mater.2018, 1705771 (2017).

(11)S. P. Shen, X. Z. Liu,Y. S. Chai, A. Studer, K. Rule, K. Zhai, L. Q. Yan, D. S. Shang, F. Klose, Y. T. Liu, D. F. Chen & Y. Sun. “Hidden spin-order-induced room-temperature ferroelectricity in a peculiar conical magnetic structure”.Physical Review B95, 094405 (2017).(通訊作者)

(12) Shi-Peng Shen,Yi-Sheng Chai, Jun-Zhuang Cong, Pei-Jie Sun, Jun Lu, Li-Qin Yan, Shou-Guo Wang, Young Sun, "Magnetic-ion-induced displacive electric polarization in FeO₅bipyramidal units of (Ba,Sr)Fe₁₂O₁₉hexaferrites",Physical Review B, 90, 180404 (2014)（通訊作者）

(13)Chai, Y. S., Oh, Y. S., Wang, L. J., Manivannan, N., Feng, S. M., Yang, Y. S., Yan, L. Q., Jin, C. Q., Kim, Kee Hoon, "Intrinsic ferroelectric polarization of orthorhombic manganites with E-type spin order",Physical Review B, 85, 4406 (2012)

(14)Y S Chai, S H Chun, S Y Haam, Y S Oh, Ingyu Kim and Kee Hoon Kim, "Low-magnetic-field control of dielectric constant at room temperature realized in Ba_0.5Sr_1.5Zn₂Fe₁₂O₂₂",New Journal of Physics, 11, 073030 (2009)

(15) S M Feng,Y S Chai, J L Zhu, N Manivannan, Y S Oh, L J Wang, Y S Yang, C Q Jin and Kee Hoon Kim, "Determination of the intrinsic ferroelectric polarization in orthorhombic HoMnO₃",New Journal of Physics, 12, 073006 (2010)（共同第一作者）

(16) Deepak Rajaram Patil,Yisheng Chai, Byung-Gu Jeon, R.C. Kambale, Jungho Ryu, Sang-Goo Lee, Jeongho Lee, Kee Hoon Kim, “Theoretical prediction of resonant and off-resonant magnetoelectric coupling in layered composites with anisotropic piezoelectric properties”,Composite Structures, 159, 498-504 (2017). (共同第一作者）

(17)S. P. Shen,Y. S. Chai, S. G. Wang, C. S. Yang, D. S. Shang & Y. Sun. “Direct measurement of thermoelectric properties of β-MnO2 in its powder form”.Applied Physics Letters110, 023102 (2017).（通訊作者）

(18) Deepak Rajaram Patil,Yisheng Chai,et al., "Enhancement of resonant and non-resonant magnetoelectric coupling in multiferroic laminates with anisotropic piezoelectric properties",Applied Physics Letters, 102, 062909 (2013) (共同第一作者）

(19)Yisheng Chai, Hongshun Yang, Jian Liu, Chenghai Sun, Huixian Gao, Xudong Chen, Liezhao Cao, and Jean-Claude Lasjaunias, "Thermal Transport Properties of Bechgaard Salts (TMTSF)₂PF₆and (TMTSF)₂ClO₄: Implication of Spin-Charge Separation",Journal of the Physical Society of Japan, 78, 063602 (2009)

(20)Chai, Y. S., Yang, H. S., Liu, J., Sun, C. H., Gao, H. X., Chen, X. D., Cao, L. Z., Lasjolunias, J. C., "Thermopower study of the quasi-one-dimensional organic conductor (TMTSF)₂PF₆SDW state",Physics Letters A, 366, 513 (2007)

(21) Shang Da-Shan，Chai Yi-Sheng，Cao Ze-Xian，Lu Jun，Sun Young, "Toward the complete relational graph of fundamental circuit elements",Chinese Physics B, 24, 068402 (2015)（共同第一作者）

其它SCI文章列表

(1)Y. Ma, J. Cong,Y. Chai, L. Yan, D. Shang, Y. Sun, “Large pyroelectric and thermal expansion coefficients in the [(CH3)2NH2]Mn (HCOO)3 metal-organic framework”.Appl. Phys. Lett.111, 042901 (2017).

(2)C. S. Yang, D. S. Shang,Y. S. Chai, L. Q. Yan, B. G. Shen & Y. Sun. “Electrochemical-reaction-induced synaptic plasticity in MoOx-based solid state electrochemical cells”.Physical Chemistry Chemical Physics19, 4190-4198 (2017).

(3)Jianxin Shen, Junzhuang Cong, Dashan Shang,Yisheng Chai, Shipeng Shen, Kun Zhai and Young Sun, “A multilevel nonvolatile magnetoelectric memory”.Scientific Reports6, 34473 (2016).

(4)P. Lu, D. Shang, J. Shen,Y. Chai, C. Yang, K. Zhai, J. Cong, S. Shen and Y. Sun. “Nonvolatile transtance change random access memory based on magnetoelectric P(VDF-TrFE)/Metglas heterostructures”,Appl. Phys. Lett.109, 252902 (2016).

(5)J. Shen, D. Shang,Y. Chai, Y. Wang, J. Cong, S. Shen, L. Yan, W. Wang and Y. Sun. “Nonvolatile Multilevel Memory and Boolean Logic Gates Based on a Single Ni/[Pb(Mg1/3Nb2/3)O3]0.7[PbTiO3]0.3/Ni Heterostructure”,Phys. Rev. Applied6, 064028 (2016).

(6) J. Shen, J. Cong,Y. Chai, D. Shang, S. Shen, K. Zhai, Y. Tian, and Y. Sun. "Nonvolatile Memory Based on Nonlinear Magnetoelectric Effects",Physical Review Applied,6, 021001 (2016)

(7) S. E. Rowley,Y. S. Chai, S. P. Shen, Y. Sun, A. T. Jones, B. E. Watts and J. F. Scott, "Uniaxial ferroelectric quantum criticality in multiferroic hexaferrites BaFe₁₂O₁₉and SrFe₁₂O₁₉",Scientific Reports6, 5 (2016)

(8) Yang, C.-S., Shang, D.-S.,Chai, Y.-S., Yan, L.-Q., Shen, B.-G., Sun, Y., "Moisture effects on the electrochemical reaction and resistance switching at Ag/molybdenum oxide interfaces",Physical Chemistry Chemical Physics,18, 12466 (2016)

(9) S. Shen, D. Shang,Y. Chai, Y. Sun, "Realization of a flux-driven memtranstor at room temperature",Chinese Physics B, 25, 027703 (2016)

(10) Filip Kadlec, Christelle Kadlec, Jakub Vít, Fedir Borodavka, Martin Kempa, Jan Prokleška, Josef Buršík, Róbert Uhrecký, Stéphane Rols,YiSheng Chai, Kun Zhai, Young Sun, Jan Drahokoupil, Veronica Goian, and Stanislav Kamba, "Electromagnon in the Z-type hexaferrite (Ba_xSr_1-x)₃Co₂Fe₂₄O₄₁",Physical Review B, 94, 024419 (2016)

(11) Tian, Ying, Shen, Shipeng, Cong, Junzhuang, Yan, Liqin,Chai, Yisheng, Sun, Young, "Long-distance super-exchange and quantum magnetic relaxation in a hybrid metal-organic framework",Chinese Physics B, 25, 017601 (2016)

(12) Hou, Zhipeng, Wang, Wenhong, Xu, Guizhou, Zhang, Xiaoming, Wei, Zhiyang, Shen, Shipeng, Liu, Enke, Yao, Yuan,Chai, Yisheng, Sun, Young, Xi, Xuekui, Wang, Wenquan, Liu, Zhongyuan, Wu, Guangheng, Zhang, Xi-xiang, "High electron mobility and large magnetoresistance in the half-Heusler semimetal LuPtBi",Physical Review B, 92, 235134(2015)

(13) Wang, Guohua, Cao, Shixun, Cao, Yiming, Hu, Shunbo, Wang, Xinyan, Feng, Zhenjie, Kang, Baojuan,Chai, Yisheng, Zhang, Jincang, Ren, Wei, "Magnetic field controllable electric polarization in Y-type hexaferrite Ba_0.5Sr_1.5Co₂Fe₁₂O₂₂",Journal of Applied Physics, 118, 4929956 (2015)

(14) Cong, Jun-Zhuang, Shen, Shi-Peng,Chai, Yi-Sheng, Yan, Li-Qin, Shang, Da-Shan, Wang, Shou-Guo, Sun, Young, "Spin-driven multiferroics in BaYFeO₄",Journal of Applied Physics,117, 4919819 (2015)

(15) Shen, Shipeng,Chai, Yisheng, Sun, Young, "Nonvolatile electric-field control of magnetization in a Y-type hexaferrite",Scientific Reports, 5, 08254 (2015)

(16) Tian, Ying, Stroppa, Alessandro,Chai, Yi-Sheng, Barone, Paolo, Perez-Mato, Manuel, Picozzi, Silvia, Sun, Young, "High-temperature ferroelectricity and strong magnetoelectric effects in a hybrid organic-inorganic perovskite framework",Physica Status Solidi-Rapid Research Letters, 9, 62 (2015)

(17) Wang, J., Xie, L. S., Wang, C. S., Zhang, H. Z., Shu, L., Bai, J.,Chai, Y. S., Zhao, X., Nie, J. C., Cao, C. B., Gu, C. Z., Xiong, C. M., Sun, Y., Shi, J., Salahuddin, S., Xia, K., Nan, C. W., Zhang, J. X., "Magnetic domain-wall motion twisted by nanoscale probe-induced spin transfer",Physical Review B, 90, 224407 (2014)

(18) Tian, Ying, Stroppa, Alessandro,Chai, Yisheng, Yan, Liqin, Wang, Shouguo, Barone, Paolo, Picozzi, Silvia, Sun, Young, "Cross coupling between electric and magnetic orders in a multiferroic metal-organic framework",Scientific Reports, 4, 06062 (2014)

(19) Kim, HyungJoon, Kim, TaiHoon, Lee, Woong-Jhae,Chai, Yisheng, Kim, JaeWook, Jwa, YeonJae, Chung, Sukhwan, Kim, SeonJoong, Sohn, Egon, Lee, SeungMin, Choi, Ki-Young, Kim, KeeHoon, "Determination of temperature-dependent thermal conductivity of a BaSnO_3-deltasingle crystal by using the 3 omega method",Thermochimica Acta, 585, 16 (2014)

(20) Zhang, Tingsong, Zhang, Chenyang, Wang, Ling,Chai, Yisheng, Shen, Shipeng, Sun, Young, Yuan, Hongming, Feng, Shouhua, "Low-Temperature Phase Transition in AgNbO₃",Journal of the American Ceramic Society, 97, 1895 (2014)

(21) Kwon, Sangil, Kang, Byeongki, Kim, Changsoo, Jo, Euna, Lee, Soonchil,Chai, YiSheng, Chun, SaeHwan, Kim, KeeHoon, "Effects of Al substitution and thermal annealing on magnetoelectric Ba_0.5Sr_1.5Zn₂Fe₁₂O₂₂investigated by the enhancement factor ofFe nuclear magnetic resonance",Journal of Physics: Condensed Matter, 26, 146004 (2014)

(22) Shen, Shipeng, Yan, Liqin,Chai, Yisheng, Cong, Junzhuang, Sun, Young, "Magnetic field reversal of electric polarization and magnetoelectric phase diagram of the hexaferrite Ba_1.3Sr_0.7Co_0.9Zn_1.1Fe_10.8Al_1.2O₂₂",Applied Physics Letters, 104, 4862690 (2014)

(23) Tian, Ying, Cong, Junzhuang, Shen, Shipeng,Chai, Yisheng, Yan, Liqin, Wang, Shouguo, Sun, Young, "Electric control of magnetism in a multiferroic metal-organic framework",Physica Status Solidi-Rapid Research Letters, 8, 91 (2014)

(24) Yan, LiQin, Lee, Bumsung, Chun, SaeHwan, Kim, Ingyu, Chung, Jae-Ho, Kim, SungBaek, Park, Ju-Young, Lee, SukHo,Chai, Yisheng, Kim, KeeHoon, "Temperature- and magnetic-field-induced change of electric polarization in a multiferroic Mn_0.93Co_0.07W_0.93O_4-deltasingle crystal",Journal of the Physical Society of Japan,82, 94708 (2013)

(25) Kwon, Sangil, Yoon, DongYoung, Lee, Soonchil,Chai, YiSheng, Chun, SaeHwan, Kim, KeeHoon, "Fe-57 NMR study of the magnetoelectric hexaferrite Ba_0.5Sr_1.5Zn₂Fe₁₂O₂₂and Ba_0.5Sr_1.5Zn₂(Fe_0.92Al_0.08)₁₂O₂₂",Physical Review B, 88, 064404 (2013)

(26) Zhao Yue-Lei,Chai Yi-Sheng, Pan Li-Qing, Sun Young, "Abnormal magnetic behaviors induced by the antisite phase boundary in La₂NiMnO₆",Chinese Physics B, 22, 087601 (2013)

(27) Patil, DeepakRajaram, Kambale, RahulC.,Chai, Yisheng, Yoon, Woon-Ha, Jeong, Dae-Yong, Park, Dong-Soo, Kim, Jong-Woo, Choi, Jong-Jin, Ahn, Cheol-Woo, Hahn, Byung-Dong, Zhang, Shujun, Kim, KeeHoon, Ryu, Jungho, "Multiple broadband magnetoelectric response in thickness-controlled Ni/[011] Pb(Mg_1/3Nb_2/3)O₃-Pb(Zr,Ti)O₃single crystal/Ni laminates",Applied Physics Letters, 103, 4817383 (2013)

(28) Sun, Y., Cong, J. -Z.,Chai, Y. -S., Yan, L. -Q., Zhao, Y. -L., Wang, S. -G., Ning, W., Zhang, Y. -H., "Giant exchange bias in a single-phase magnet with two magnetic sublattices",Applied Physics Letters,102, 4804179 (2013)

(29) Kambale, RahulC., Patil, Deepak, Ryu, Jungho,Chai, YiSheng, Kim, KeeHoon, Yoon, Woon-Ha, Jeong, Dae-Yong, Park, Dong-Soo, Kim, Jong-Woo, Choi, Jong-Jin, Ahn, Cheol-Woo, "Colossal magnetoelectric response of PZT thick films on Ni substrates with a conductive LaNiO₃electrode",Journal of Physics D: Applied Physics, 46, 092002 (2013)

(30) Lee, HakBong, Chun, SaeHwan, Shin, KwangWoo, Jeon, Byung-Gu,Chai, YiSheng, Kim, KeeHoon, Schefer, Juerg, Chang, Hun, Yun, Sae-Na, Joung, Tae-Young, Chung, Jae-Ho, "Heliconical magnetic order and field-induced multiferroicity of the Co₂Y-type hexaferrite Ba_0.3Sr_1.7Co₂Fe₁₂O₂₂",Physical Review B,86, 094435 (2012)

(31) Wang, L. J.,Chai, Y. S., Feng, S. M., Zhu, J. L., Manivannan, N., Jin, C. Q., Gong, Z. Z., Wang, X. H., Li, L. T., "Large magneto (thermo) dielectric effect in multiferroic orthorhombic LuMnO₃",Journal of Applied Physics, 111, 14103 (2012)

(32) Patil, Deepak, Kim, June-Hee,Chai, YiSheng, Nam, Joong-Hee, Cho, Jeong-Ho, Kim, Byung-Ik, Kim, KeeHoon, "Large longitudinal magnetoelectric coupling in NiFe₂O₄-BaTiO₃laminates",Applied Physics Express, 4, 073001 (2011)

(33) Lee, HakBong, Song, Young-Sang, Chung, Jae-Ho, Chun, SaeHwan,Chai, YiSheng, Kim, KeeHoon, Reehuis, M., Prokes, K., Mat'as, S., "Field-induced incommensurate-to-commensurate phase transition in the magnetoelectric hexaferrite Ba_0.5Sr_1.5Zn2(Fe_1-xAl_x)₁₂O₂₂",Physical Review B,83, 144425 (2011)

(34) Liu, Yong,Chai, YiSheng, Kim, Hyeong-Jin, Stewart, G. R., Kim, KeeHoon, Ren, Zhi-An, Zhao, Zhong-Xian, "Current-voltage Characteristics of NdFeAsO_0.85F_0.15and NdFeASO_0.85Superconductors",Journal of the Korean Physical Society, 55, L383(2009)

(35) Sun, C. H., Yang, H. S.,Chai, Y. S., Liu, J., Gao, H. X., Cheng, L., Wang, J. B., Cao, L. Z., "The transport properties in Nd_0.75Sr_1.25CoO₄film: Evidence for polaronic transport",Journal of Physics and Chemistry of Solids,70, 286 (2009)

(36) Dadras, S., Liu, Y.,Chai, Y. S., Daadmehr, V., Kim, K. H., "Increase of critical current density with doping carbon nano-tubes in YBa₂Cu₃O_7-delta",Physica C-Superconductivity and Its Applications,469, 55 (2009)

(37) Liu, Jian, Yang, HongShun,Chai, YiSheng, Sun, ChengHai, Gao, HuiXian, Cheng, Lu, Wang, JianBin, Cao, LieZhao, "Transport properties in Nd_1.85Ce_0.15CuO₄single crystals under different annealing conditions",Superconductor Science and Technology, 22, 015013 (2009)

(38) Ye, Jing, Chen, Qianwang, Xiong, Ying,Chai, Yisheng, Chen, Peiran, "One-step electroless synthesis and properties of copper film deposited on silicon substrate",Physica Status Solidi A-Applications and Materials Science, 205, 1580 (2008)

(39) Gao, H. X., Yang, H. S.,Chai, Y. S., Liu, J., Sun, C. H., Cheng, L., Wang, J. B., Cao, L. Z., "Study on thermopower and resistivity of Nd_1.85Ce_0.15CuO_4+deltasingle crystals: Evidence for two-band model",Physics Letters A, 369, 493 (2007)

(40) Liu, Jian, Yang, HongShun, Gao, HuiXian, Li, Di, Sun, ChengHai,Chai, YiSheng, Chen, XuDong, Qin, XiaoYing, Cao, LieZhao, "Study on the thermopower of Bi intercalated TiS₂: Evidence of thin, lens-shaped Fermi pockets",Physics Letters A, 360, 344 (2006)

(41)Chai, YS, Yang, HS, Liu, J, Ji, M, Bai, YB, Cao, LZ, Lasjaunias, JC, "Study on the high-resolution thermoelectric power of metallic state quasi-one-dimensional organic superconductor of (TMTSF)₂ClO₄salt",Acta Physica Sinica, 53, 2310 (2004)

(42) Yang, HS,Chai, YS, Liu, J, Yu, M, Li, PC, Zhang, L, Li, MD, Cao, LZ, "Anomalous thermopower of the electron-doped superconductor, Sm_2-xCe_xCuO₄",Physica C-Superconductivity and Its Applications,403, 203 (2004)

(43) Yang, HS, Li, PC,Chai, YS, Yu, M, Li, ZQ, Li, MD, Cao, LZ, Wen, HH, Long, YZ, Chen, ZJ, "Study on the thermopower and magnetic properties of Zn doped La₂CuO₄",Acta Physica Sinica,51, 2155 (2002)

(44) Yu, M, Yang, HS,Chai, YS, Li, PC, Li, MD, Cao, LZ, "Pseudogap in electron-doped superconductor Sm_1.85Ce_0.15CuO₄crystal",Acta Physica Sinica,51, 1832 (2002)

(45) Yu, M, Yang, HS, Ruan, KQ, Li, PC, Li, HL,Chai, YS, Cao, LZ, "Study of resistivity and thermopower of La_2-xSr_xCuO₄thin films",Acta Physica Sinica,51, 663 (2002)

(46) Yu, M, Yang, HS,Chai, YS, Ruan, KQ, Li, PC, Li, ZQ, Chen, ZJ, Cao, LZ, "Anomalous thermopower and resistivity of the electron-doped superconductor Sm_2-xCe_xCuO₄(0.00 <= x <= 0.21)",Acta Physica Sinica,51, 674 (2002)

(47) Yang, HS, Li, PC,Chai, YS, Yu, M, Li, ZQ, Yang, DS, Zhang, L, Wang, YH, Li, MD, Cao, LZ, Long, YZ, Chen, ZJ, "A study of thermal conductivity and resistivity properties of Zn-doped La₂CuO₄",Acta Physica Sinica,51, 679 (2002)

(48) Yang, HS, Yu, M, Li, SY, Li, PC,Chai, YS, Zhang, L, Chen, XH, Cao, LZ, "Study on the thermopower and resistivity of a new superconductor MgB₂",Acta Physica Sinica,50, 1197 (2001)

(49) Yang, HS, Wang, YX, Li, PC,Chai, YS, Hou, BH, Cao, LZ, "Low temperature magnetic properties of CuGe_1-xGa_xO₃",Acta Physica Sinica,50, 126 (2001)