Unusual doping and temperature dependence of photoemission spectra from manganites

Autor:	Sanyal, Prabuddha, Gupta, Subhra Sen, Pakhira, Nandan, Krishnamurthy, H. R., Sarma, D. D., Ramakrishnan, T. V.
Rok vydání:	2007
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1209/0295-5075/82/47010
Popis:	A recent, major, puzzle in the core-level photoemission spectra of doped manganites is the observation of a 1-2 eV wide shoulder with intensity varying with temperature T as the square of the magnetization over a T scale of order 200K, an order of magnitude less than electronic energies. This is addressed and resolved here, by extending a recently proposed two electron fluid l-b model for these systems to include core-hole effects. The shoulder arises from a rapid redistribution of e_g electron density, as a function of T, between the highly localized (l) and band-like (b) states. Furthermore, our theory leads to a correspondence between spectral changes due to increasing doping and decreasing T, as experimentally observed. Comment: 5 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0704.3923 Zobrazit plný text záznamu View this record from Arxiv