Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-02-06
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 1 figure, submitted to J. Phys. Soc. Japan
Scientific paper
10.1143/JPSJ.68.1500
Motivated by the observation of unusual magnetism in Ce_xCu_2Si_2 ($x\sim 1$), we study the effect of disorder, such as Ce vacancy, on the competition between superconductivity (SC) and antiferromagnetism (AF) on the basis of the phenomenological Ginzburg-Landau theory. Assuming that the AF-SC transition is of first order in clean system, we show that a single impurity in the SC state can induce staggered magnetization by suppressing the SC around it. For finite concentration of impurities, the first-order AF-SC boundary in the clean case is replaced by a finite region where the SC and the induced AF moments coexist microscopically with spatially varying order parameters. We argue that spin excitation spectrum in the coexistent state has a dual structure of SC gapped mode and the low-energy spin-wave mode. In accordance with the emergence of AF out of SC ground state, the spectral weight will be transferred from the former mode to the latter, keeping the structure of both modes basically unchanged.
Fukuyama Hidetoshi
Kohno Hiroshi
Sigrist Manfred
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