Coexistence of superconductivity and antiferromagnetism in the heavy-fermion superconductor CeCu2(Si1-xGex)2probed by means of Cu nuclear quadrupole resonance - a test case for the SO(5) theory

Autor:	O. Trovarelli, Frank Steglich, Kenji Ishida, Yasuo Kitaoka, Yu Kawasaki, C. Geibel
Rok vydání:	2001
Předmět:	Physics Superconductivity SO(5) Condensed matter physics Homogeneous Microscopic level Antiferromagnetism General Materials Science Heavy fermion superconductor Condensed Matter Physics
Zdroj:	Journal of Physics: Condensed Matter. 13:L79-L88
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/13/4/103
Popis:	We report on the basis of Cu-NQR measurements that superconductivity (SC) and antiferromagnetism (AF) coexist on a microscopic level in CeCu_{2}(Si_{1-x}Ge_{x})_{2}, once a tiny amount of 1%Ge (x = 0.01) is substituted for Si. This coexistence arises because Ge substitution expands the unit-cell volume in nearly homogeneous CeCu2Si2 where the SC coexists with slowly fluctuating magnetic waves. We propose that the underlying exotic phases of SC and AF in either nearly homogeneous or slightly Ge substituted CeCu2Si2 are accountable based on the SO(5) theory that unifies the SC and AF. We suggest that the mechanism of the SC and AF is common in CeCu2Si2.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5170a9a7976191e20172c34bb5c03022 https://doi.org/10.1088/0953-8984/13/4/103 Zobrazit plný text záznamu