TY - JOUR
T1 - Superconductivity in MgB2 and its related materials
AU - Akimitsu, Jun
AU - Akutagawa, Satoshi
AU - Kawashima, Kenji
AU - Muranaka, Takahiro
PY - 2005
Y1 - 2005
N2 - After the discovery of MgB2, much attention has been paid to the boride and carbide systems. In this paper, we mainly review the following themes. First, we review the present situation of the superconductivity in MgB2, which can be interpreted in terms of BCS-type phonon mediated pairing. In particular, we focus on the relationship between the superconductivity and the crystal structure in MgB2 and two gap feature. Second, we review our present status for the new superconductors including the boron and carbon systems. Recently, we discovered new superconductivity in related compounds W7Re13X (X = B and C) (Tc = 7.1 K and 7.3 K, respectively) and Y2C 3 (Tc = 18 K), and we elucidated their superconducting properties. The crystal structure of W7Re13X (X = B and C) is β-Mn type (cubic, space group: P4132), and Re atoms form a distorted octahedron. The superconductivity in W7Re13X system is recognized as strong coupling s-wave symmetry from the specific heat measurement. We discovered the superconductivity at Tc = 18 K in Y2C3, although this material with a maximum Tc of 11.5 K has already investigated by Krupka et al. The crystal structure of Y2C3 is body centered cubic (Pu2C 3-type) structure, and Y atoms are one-dimensionally aligned along [111] axis. The lattice parameter, a, obtained in our work is between 8.18-8.23 Å, and is smaller than those previously reported (8.21-8.25 Å).
AB - After the discovery of MgB2, much attention has been paid to the boride and carbide systems. In this paper, we mainly review the following themes. First, we review the present situation of the superconductivity in MgB2, which can be interpreted in terms of BCS-type phonon mediated pairing. In particular, we focus on the relationship between the superconductivity and the crystal structure in MgB2 and two gap feature. Second, we review our present status for the new superconductors including the boron and carbon systems. Recently, we discovered new superconductivity in related compounds W7Re13X (X = B and C) (Tc = 7.1 K and 7.3 K, respectively) and Y2C 3 (Tc = 18 K), and we elucidated their superconducting properties. The crystal structure of W7Re13X (X = B and C) is β-Mn type (cubic, space group: P4132), and Re atoms form a distorted octahedron. The superconductivity in W7Re13X system is recognized as strong coupling s-wave symmetry from the specific heat measurement. We discovered the superconductivity at Tc = 18 K in Y2C3, although this material with a maximum Tc of 11.5 K has already investigated by Krupka et al. The crystal structure of Y2C3 is body centered cubic (Pu2C 3-type) structure, and Y atoms are one-dimensionally aligned along [111] axis. The lattice parameter, a, obtained in our work is between 8.18-8.23 Å, and is smaller than those previously reported (8.21-8.25 Å).
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U2 - 10.1143/PTPS.159.326
DO - 10.1143/PTPS.159.326
M3 - Article
AN - SCOPUS:29444437092
VL - 159
SP - 326
EP - 337
JO - Progress of Theoretical Physics Supplement
JF - Progress of Theoretical Physics Supplement
SN - 0375-9687
ER -