Superconductivity in Mg-Doped Layered Intermetallic Compound NbB 2

Autor:	Xie Si-Shen, Luo Jian-Lin, Liu Guang-Tong, Jin Duo, Jin Hao, Sun Lian-Feng, Che Guang-Can, Geng Hong-Xia, Li Zheng
Rok vydání:	2008
Předmět:	Superconductivity Materials science Condensed matter physics Transition temperature Doping Intermetallic General Physics and Astronomy Atmospheric temperature range symbols.namesake Electrical resistivity and conductivity Condensed Matter::Superconductivity symbols Critical field Debye model
Zdroj:	Chinese Physics Letters. 25:687-690
ISSN:	1741-3540 0256-307X
Popis:	We have performed low temperature resistivity ?(T) and specific heat C(T) measurements on a superconducting polycrystalline Nb0.75Mg0.25B2 sample. The results indicate that the superconducting transition temperature is ~ 4.6 K. The zero temperature upper critical field determined from the resistivity and specific heat is 3123 Oe. The electronic coefficient of specific heat ?n = 4.51 mJmol?1K2 and the Debye temperature ?D = 419K are obtained by fitting the zero-field specific heat data in the normal state. At low temperatures, the electronic specific heat in the superconducting state follows Ces/?nTc = 2.84exp(-1.21Tc/T). This indicates that the superconducting pairing in Nb0.75Mg0.25B2 has s-wave symmetry.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c73ae6d58ed38328eb80e22be4c0c18c https://doi.org/10.1088/0256-307x/25/2/090 Zobrazit plný text záznamu