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Effect of Ga substitution on the optical properties of La-Sr manganites (Articolo in rivista)

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Effect of Ga substitution on the optical properties of La-Sr manganites (Articolo in rivista) (literal)

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Nucara, A; Maselli, P; Del Bufalo, M; Guidi, MC; Garcia, J; Orgiani, P; Maritato, L; Calvani, P (2008)
Effect of Ga substitution on the optical properties of La-Sr manganites
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)

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Nucara, A; Maselli, P; Del Bufalo, M; Guidi, MC; Garcia, J; Orgiani, P; Maritato, L; Calvani, P (literal)

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\"[Nucara, A.; Maselli, P.; Del Bufalo, M.; Calvani, P.] Univ Roma La Sapienza, Coherentia CNR INFM, I-00185 Rome, Italy; [Nucara, A.; Maselli, P.; Del Bufalo, M.; Calvani, P.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; [Guidi, M. Cestelli] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy; [Garcia, J.] Consejo Super Invest Cient, Inst Ciencia Mat Aragon, Zaragoza 50009, Spain; [Garcia, J.] Consejo Super Invest Cient, Dept Fis Mat Condensada, Zaragoza 50009, Spain; [Garcia, J.] Univ Zaragoza, E-50009 Zaragoza, Spain; [Orgiani, P.; Maritato, L.] Univ Salerno, Coherentia CNR INFM, I-84081 Baronissi, Italy; [Orgiani, P.; Maritato, L.] Univ Salerno, Dipartimento Fis, I-84081 Baronissi, Italy (literal)

Titolo

Effect of Ga substitution on the optical properties of La-Sr manganites (literal)

Abstract

In a metallic manganite, the substitution of Mn+3 by Ga+3 locally destroys both the ferromagnetic order and the Jahn-Teller distortion, without heavily affecting the crystal structure. One can thus observe an unusual metal-to-insulator transition, which is induced neither by the temperature nor by changes in the divalent-ion doping. This transition is studied here by comparing the infrared reflectivity of five samples of La2/3Sr1/3Mn1-xGaxO3, with x increasing from 0 to 0.30. The dramatic effect of Ga on the transport properties is monitored through the decrease in the number of free carriers and the increase in their effective mass, until a good metal such as La2/3Sr1/3MnO3 is turned into an insulator at all temperatures. A simple model which links the measured optical parameters to the magnetization M(x,T) well describes the behavior of the plasma frequency, the scattering rate, and the midinfrared absorption, throughout the Ga-induced metal-to-insulator transition. (literal)

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