Phase separation is a crucial ingredient of the physics of manganites;however, the role of mixed phases in the development of the co-lossal magnetoresistance (CMR) phenomenon still needs to be clar-ified. We report the realization of CMR in a single-valent LaMnO3manganite. We found that the insulator-to-metal transition at 32GPa is well described using the percolation theory. Pressure inducesphase separation, and the CMR takes place at the percolation thresh-old. A large memory effect is observed together with the CMR, sug-gesting the presence of magnetic clusters. The phase separationscenario is well reproduced, solving a model Hamiltonian. Our re-sults demonstrate in a clean way that phase separation is at theorigin of CMR in LaMnO3.
Origin of colossal magnetoresistance in LaMnO<inf>3</inf> manganite / Baldini, Maria; Muramatsu, Takaki; Sherafati, Mohammad; Mao, Ho Kwang; Malavasi, Lorenzo; Postorino, Paolo; Satpathy, Sashi; Struzhkin, Viktor V.. - In: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA. - ISSN 0027-8424. - STAMPA. - 112:35(2015), pp. 10869-10872. [10.1073/pnas.1424866112]
Origin of colossal magnetoresistance in LaMnO3 manganite
POSTORINO, Paolo;
2015
Abstract
Phase separation is a crucial ingredient of the physics of manganites;however, the role of mixed phases in the development of the co-lossal magnetoresistance (CMR) phenomenon still needs to be clar-ified. We report the realization of CMR in a single-valent LaMnO3manganite. We found that the insulator-to-metal transition at 32GPa is well described using the percolation theory. Pressure inducesphase separation, and the CMR takes place at the percolation thresh-old. A large memory effect is observed together with the CMR, sug-gesting the presence of magnetic clusters. The phase separationscenario is well reproduced, solving a model Hamiltonian. Our re-sults demonstrate in a clean way that phase separation is at theorigin of CMR in LaMnO3.| File | Dimensione | Formato | |
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