Magnetic-field-dependent optical studies of Pr0.69Ca0.31MnO3

H. J. Lee; J. H. Jung; K. H. Kim; M. W. Kim; T. W. Noh; Y. Moritomo; Y. J. Wang; X. Wei

doi:10.1016/S0921-4534(01)00863-2

Magnetic-field-dependent optical studies of Pr_0.69Ca_0.31MnO₃

H. J. Lee, J. H. Jung, K. H. Kim, M. W. Kim, T. W. Noh, Y. Moritomo, Y. J. Wang, X. Wei

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We investigated magnetic-field-dependent optical conductivity spectra σ(ω) of Pr_0.69Ca_0.31MnO₃ at 4.2 K, which was in a charge-ordered insulating state at 0 T. With increasing the magnetic field up to 12 T, we observed an insulator-metal transition around 4 T and large spectral weight changes up to 4 eV. Especially, we found that the spectral weight above 0.5 eV moved to a lower energy region and that a Drude-like peak appeared clearly at 12 T. By analyzing dielectric response changes, we suggested that the field-dependent insulator-metal transition might occur through a percolation process of ferromagnetic metal domains. On the other hand, with decreasing the magnetic field from 12 to 0 T, σ(ω) showed little changes, which showed that the ferromagnetic metallic state did not return to the insulating state.

Original language	English
Pages (from-to)	614-617
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	364-365
DOIs	https://doi.org/10.1016/S0921-4534(01)00863-2
State	Published - Nov 2001
Externally published	Yes

Bibliographical note

Funding Information:
This work was financially supported by the Ministry of Science and Technology through Creative Research Initiative Program and by the Ministry of Education through the BK 21 Program.

Keywords

Field-induced insulator-metal transition
Optical conductivity spectra
Percolation process

Access to Document

10.1016/S0921-4534(01)00863-2

Cite this

@article{719d00193ee843378b9d5acbac4fe00d,

title = "Magnetic-field-dependent optical studies of Pr0.69Ca0.31MnO3",

abstract = "We investigated magnetic-field-dependent optical conductivity spectra σ(ω) of Pr0.69Ca0.31MnO3 at 4.2 K, which was in a charge-ordered insulating state at 0 T. With increasing the magnetic field up to 12 T, we observed an insulator-metal transition around 4 T and large spectral weight changes up to 4 eV. Especially, we found that the spectral weight above 0.5 eV moved to a lower energy region and that a Drude-like peak appeared clearly at 12 T. By analyzing dielectric response changes, we suggested that the field-dependent insulator-metal transition might occur through a percolation process of ferromagnetic metal domains. On the other hand, with decreasing the magnetic field from 12 to 0 T, σ(ω) showed little changes, which showed that the ferromagnetic metallic state did not return to the insulating state.",

keywords = "Field-induced insulator-metal transition, Optical conductivity spectra, Percolation process",

author = "Lee, {H. J.} and Jung, {J. H.} and Kim, {K. H.} and Kim, {M. W.} and Noh, {T. W.} and Y. Moritomo and Wang, {Y. J.} and X. Wei",

note = "Funding Information: This work was financially supported by the Ministry of Science and Technology through Creative Research Initiative Program and by the Ministry of Education through the BK 21 Program.",

year = "2001",

month = nov,

doi = "10.1016/S0921-4534(01)00863-2",

language = "English",

volume = "364-365",

pages = "614--617",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Magnetic-field-dependent optical studies of Pr0.69Ca0.31MnO3

AU - Lee, H. J.

AU - Jung, J. H.

AU - Kim, K. H.

AU - Kim, M. W.

AU - Noh, T. W.

AU - Moritomo, Y.

AU - Wang, Y. J.

AU - Wei, X.

N1 - Funding Information: This work was financially supported by the Ministry of Science and Technology through Creative Research Initiative Program and by the Ministry of Education through the BK 21 Program.

PY - 2001/11

Y1 - 2001/11

N2 - We investigated magnetic-field-dependent optical conductivity spectra σ(ω) of Pr0.69Ca0.31MnO3 at 4.2 K, which was in a charge-ordered insulating state at 0 T. With increasing the magnetic field up to 12 T, we observed an insulator-metal transition around 4 T and large spectral weight changes up to 4 eV. Especially, we found that the spectral weight above 0.5 eV moved to a lower energy region and that a Drude-like peak appeared clearly at 12 T. By analyzing dielectric response changes, we suggested that the field-dependent insulator-metal transition might occur through a percolation process of ferromagnetic metal domains. On the other hand, with decreasing the magnetic field from 12 to 0 T, σ(ω) showed little changes, which showed that the ferromagnetic metallic state did not return to the insulating state.

AB - We investigated magnetic-field-dependent optical conductivity spectra σ(ω) of Pr0.69Ca0.31MnO3 at 4.2 K, which was in a charge-ordered insulating state at 0 T. With increasing the magnetic field up to 12 T, we observed an insulator-metal transition around 4 T and large spectral weight changes up to 4 eV. Especially, we found that the spectral weight above 0.5 eV moved to a lower energy region and that a Drude-like peak appeared clearly at 12 T. By analyzing dielectric response changes, we suggested that the field-dependent insulator-metal transition might occur through a percolation process of ferromagnetic metal domains. On the other hand, with decreasing the magnetic field from 12 to 0 T, σ(ω) showed little changes, which showed that the ferromagnetic metallic state did not return to the insulating state.

KW - Field-induced insulator-metal transition

KW - Optical conductivity spectra

KW - Percolation process

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