Theory of the magnetoeletric effect in a lightly doped high-Tc cuprate

Autor:	Mukherjee, S., Andersen, B. M., Viskadourakis, Z., Radulov, I., Panagopoulos, C.
Rok vydání:	2011
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Materials Science Condensed Matter - Strongly Correlated Electrons
Zdroj:	Phys. Rev. B 85, 140405(R) (2012)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.85.140405
Popis:	In a recent study Viskadourakis et al. discovered that extremely underdoped La_2CuO_(4+x) is a relaxor ferroelectric and a magnetoelectric material at low temperatures. It is further observed that the magnetoelectric response is anisotropic for different directions of electric polarization and applied magnetic field. By constructing an appropriate Landau theory, we show that a bi-quadratic magnetoelectric coupling can explain the experimentally observed polarization dependence on magnetic field. This coupling leads to several novel low-temperature effects including a feedback enhancement of the magnetization below the ferroelectric transition, and a predicted magnetocapacitive effect. Comment: 5 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1112.1524 Zobrazit plný text záznamu View this record from Arxiv