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Abstract
In this paper, we report the formation and superconductivity of quaternary intermetallic system Yni2B2Cx with ThCr2Si2-type structure. Samples prepared by arc-melting crystallize in single phase of the composition of YNi2B2Cx when x=0.9—1.2 while the secondary unknown phases increase obviously when x＜0.8 or x＞1.2. Superconducting-transition temperature Tc determined by the tem,perature dependence of magnetization displays two steps with increasing carbon concentration: Tc≈12.5K for x≤0.8, Tx≈15K for x≥0.9.
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Wang Fang-Wei,

Yan Qi-Wei,

Yuan Peng,

Shen Bao-Gen,

Zhang Pao-Lin

1.
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[1]	Zhang Ya-Nan, Wang You-Jun, Kong Ling-Ti, Li Jin-Fu.Influence of Y addition on the glass forming ability and soft magnetic properties of Fe-Si-B amorphous alloy. Acta Physica Sinica, 2012, 61(15): 157502.doi:10.7498/aps.61.157502
[2]	WENG ZHENG-YU, WU HANG-SHENG.RELATION BETWEEN THE FORM OF THE NORMALIZED EFFECTIVE PHONON SPECTRUM AND THE SUPERCONDUCTING Tc. Acta Physica Sinica, 1988, 37(2): 239-247.doi:10.7498/aps.37.239
[3]	FENG SHI-PING, MA BEN-KUN.THEORETICAL EXPLANATION OF THE CHANGES OF SUPERCONDUCTING CRITICAL TEMPERATURE OF Ba-Y-Cu-O WITH PRESSURES. Acta Physica Sinica, 1988, 37(7): 1177-1179.doi:10.7498/aps.37.1177
[4]	FENG SHI-PING.THEORETICAL EXPLANTION OF SUPERCONDUCTIV CRITICAL TEMPERATUARE CHANGES OF CeCu2Si2 WITH PRESSURE. Acta Physica Sinica, 1986, 35(5): 687-690.doi:10.7498/aps.35.687
[5]	WENG ZHENG-YU, WU HANG-SHENG.THEORY OF THE CRITICAL TEMPERATURE FOR SUPERCONDUCTORS WITH SMALL λ(III). Acta Physica Sinica, 1986, 35(4): 549-552.doi:10.7498/aps.35.549
[6]	WANG GUANG-HOU.HYDROGEN DISTRIBUTION IN THE ION IMPLANTED SUPERCONDUCTOR PdCu AND ITS TRANSITION TEMPERATURE. Acta Physica Sinica, 1984, 33(10): 1434-1436.doi:10.7498/aps.33.1434
[7]	WENG ZHENG-YU, WU HANG-SHENG.THEORY OF THE CRITICAL TEMPERATURE FOR SUPERCONDUCTORS WITH SMALLλ (Ⅱ). Acta Physica Sinica, 1984, 33(9): 1326-1331.doi:10.7498/aps.33.1326
[8]	WU HANG-SHENG, WENG ZHEN-YU.THEORY OF THE CRITICAL TEMPERATURE FOR SUPERCONDUCTORS WITH SMALL λ (Ⅰ). Acta Physica Sinica, 1984, 33(7): 975-988.doi:10.7498/aps.33.975
[9]	CAI XUE-YU, YIN DAO-LE.THE CALCULATION OF CRITICAL TEMPERATURE FOR Nb-Cu MULTILAYER FILM SUPERCONDUCTOR. Acta Physica Sinica, 1983, 32(5): 681-684.doi:10.7498/aps.32.681
[10]	LI HONG-CHENG.MODIFICATION OF THE COEFFICIENTS OF THE SERIES FORMULA FOR THE SUPERCONDUCTING CRITICAL TEMPERATURE. Acta Physica Sinica, 1982, 31(5): 693-698.doi:10.7498/aps.31.693
[11]	LEI XIAO-LIN.SINGULAR POINT zph AND THE SERIES FOR SUPERCONDUCTING CRITICAL TEMPERATURE. Acta Physica Sinica, 1981, 30(10): 1376-1382.doi:10.7498/aps.30.1376
[12]	Wang Zhong-yan, Zhou Zi-fang, Mao De-qiang, Zhang Xi-xiang, Wu Hang-sheng.AN APPROXIMATE T_cFORMULA OF TYPE A SUPERCONDUCTORS (Ⅱ)——IN CASE OFμ^{*^≠0}. Acta Physica Sinica, 1980, 29(7): 843-849.doi:10.7498/aps.29.843
[13]	WU HANG-SHENG, ZHOU ZI-FANG, WANG ZHONG-YAN, ZHANG XI-XIANG.AN APPROXIMATE T_cFORMULA OF TYPE A SUPERCONDUCTORS (Ⅰ)——CASE OF μ^*= 0. Acta Physica Sinica, 1980, 29(4): 409-418.doi:10.7498/aps.29.409
[14]	LEI XIAO-LIN.A NOTE ON THE RADIUS OF CONVERGENCE OF THE SERIES FOR SUPERCONDUCTING CRITICAL TEMPERATURE. Acta Physica Sinica, 1980, 29(10): 1333-1337.doi:10.7498/aps.29.1333
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[16]	LI HONG-CHENG.INFLUENCE OF EFFECTIVE PHONON SPECTRUM α²F(ω) ON T_cOF SUPERCONDUCTORS. Acta Physica Sinica, 1979, 28(1): 104-116.doi:10.7498/aps.28.104
[17]	CAI JUN-DAO, JI GUANG-DA, WU HANG-SHENG, CAI JIAN-HUA, GONG CHANG-DE.THEORY OF THE SUPERCONDUCTING CRITICAL TEMPERATURE (Ⅲ). Acta Physica Sinica, 1979, 28(3): 393-405.doi:10.7498/aps.28.393
[18]	GONG CHANG-DE, WU HANG-SHENG, CAI JIAN-HUA, CAI JUN-DAO, JI GUANG-DA.THEORY OF THE SUPERCONDUCTING CRITICAL TEMPERATURE (Ⅱ). Acta Physica Sinica, 1978, 27(1): 85-93.doi:10.7498/aps.27.85
[19]	CAI JIAN-HUA, WU HANG-SHENG.SEARCH FOR A RIGOROUS FORMULA OF THE SUPERCONDUCTING CRITICAL TEMPERATURE. Acta Physica Sinica, 1977, 26(6): 550-552.doi:10.7498/aps.26.550
[20]	WU HANG-SHENG, CAI JIAN-HUA, GONG CHANG-DE, JI GUANG-DA, CAI JUN-DAO.THEORY OF THE SUPERCONDUCTING CRITICAL TEMPERATURE (Ⅰ). Acta Physica Sinica, 1977, 26(6): 509-520.doi:10.7498/aps.26.509

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Vol. 48, Issue 13 - 1999-07-05

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