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26 April 2024 |
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Metal-insulator transition induced by 16O -18O oxygen isotope exchange in colossal negative magnetoresistance manganites | | N. A. Babushkina
; L. M. Belova
; V. I. Ozhogin
; O. Yu. Gorbenko
; A. R. Kaul
; A. A. Bosak
; D. I. Khomskii
; K. I. Kugel
; | | Date: |
25 May 1998 | | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | | Abstract: | The effect of 16O-18O isotope exchange on the electric resistivity was studied for (La(1-y)Pr(y))0.7Ca0.3MnO3 ceramic samples. Depending on y, this mixed perovskite exhibited different types of low-temperature behavior ranging from ferromagnetic metal (FM) to charge ordered (CO) antiferromagnetic insulator. It was found that at y=0.75, the substitution of 16O by 18O results in the reversible transition from a FM to a CO insulator at zero magnetic field. The applied magnetic field (H >= 2 T) transformed the sample with 18O again to the metallic state and caused the increase in the FM transition temperature Tc of the 16O sample. As a result, the isotope shift of Tc at H = 2 T was as high as 63 K. Such unique sensitivity of the system to oxygen isotope exchange, giving rise even to the metal-insulator transition, is discussed in terms of the isotope dependence of the effective electron bandwidth which shifts the balance between the CO and FM phases. | | Source: | arXiv, cond-mat/9805315 | | Services: | Forum | Review | PDF | Favorites | |
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