Low Temperature Specific Heat of Superconducting MgB2
LUO Jian-Lin1, ZHANG Jie1,3, CHEN Zhao-Jia1, BAI Hai-Yang1, WANG Yu-Peng1, MENG Ji-Bao1, JIN Duo1, REN Zhi-An2, CHE Guang-Can2, ZHAO Zhong-Xian2
1Laboratory of Extreme Condition Physics, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
3Department of Physics, Chongqing University, Chongqing 400044
Low Temperature Specific Heat of Superconducting MgB2
1Laboratory of Extreme Condition Physics, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
3Department of Physics, Chongqing University, Chongqing 400044
Abstract： The specific heat of the recently discovered superconductor MgB2 has been measured at temperatures ranging from 4.5 to 80 K. Superconducting anomaly ΔC at Tc is clearly observed. The total specific heat in normal state can be well fitted by electronic and phonon contributions. The Debye temperature θD is obtained to be 737 K, much larger than other intermetallic superconductors. Normal state electronic specific heat coefficient γ is found to be 2.48 ± 0.5 mJ/mol.K2 and ΔC/γTc is between 1.41 and 2.15.
LUO Jian-Lin;ZHANG Jie;CHEN Zhao-Jia;BAI Hai-Yang;WANG Yu-Peng;MENG Ji-Bao;JIN Duo;REN Zhi-An;CHE Guang-Can;ZHAO Zhong-Xian. Low Temperature Specific Heat of Superconducting MgB2[J]. 中国物理快报, 2001, 18(6): 820-822.
LUO Jian-Lin, ZHANG Jie, CHEN Zhao-Jia, BAI Hai-Yang, WANG Yu-Peng, MENG Ji-Bao, JIN Duo, REN Zhi-An, CHE Guang-Can, ZHAO Zhong-Xian. Low Temperature Specific Heat of Superconducting MgB2. Chin. Phys. Lett., 2001, 18(6): 820-822.
2001, Vol. 18 
