Magnetic Phases and Possible Magnetic Pairing in Doped Lanthanum Cuprate
نویسنده
چکیده
We discuss the temperature-concentration (T-x) phase diagram of La2-x(SrlBa)xCuO4. The magnetic interactions of the hole spins with the Cu spins yield frustration, explaining the fast decrease in the NEel temperature and yielding a new spin glass phase. The same interactions yield a strong attractive hole-hole potential, which can lead to pairing and superconductivity. 1. INTRODUCTION Both La2.x(Sr,Ba)xCuO4_6 and YBa2Cu306+6 exhibit antiferromagnetism (AF), with high N6el temperatures, at low doping, and superconductivity (SC), at higher doping. In both cases, there exist strong AF exchange interactions (J-1100 K) between the Cu spins in the CuO2 planes. The possible relevance of magnetism to the SC is thus a topic of much current research. Since we believe the physics of the two classes of high Tc superconductors is the same, we discuss the simpler case of La2.xSrxCuO4, which exhibits the T-x phase diagram shown (schematically) in Fig. 1. Given
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Effect of structure on the electronic density of states of doped lanthanum cuprate.
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