Irreversible photoinduced insulator-metal transition in charge ordered Pr0.75Na0.25MnO3

T. Satoh; Y. Kikuchi; K. Miyano; E. Pollert; J. Hejtmánek; Z. Jirák

doi:10.1080/01411590290034083

Irreversible photoinduced insulator-metal transition in charge ordered Pr_0.75Na_0.25MnO₃

T. Satoh, Y. Kikuchi, K. Miyano, E. Pollert, J. Hejtmánek, Z. Jirák

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

2 Citations (Scopus)

Abstract

Irreversible photoinduced insulator-metal transition has been observed in a perovskite manganite doped with monovalent Na⁺, Pr _0.75Na_0.25MnO₃. The increase of the conductance is estimated to be of the order of 10⁴-10⁵, considering the shallow penetration depth (∼0.1 μm) of illumination light. Analysis of the dc- and ac-susceptibility data shows that the system is in a cluster glass state below 45K, which means that ferromagnetic metallic clusters exist in insulating matrix. The photo-excitation helps the clusters to dislodge from a local energy minimum and to seek more stable configuration. The observed large increase of the conductivity can be well explained by the percolative conduction. We argue that metastability is due to the large charge mismatch between the monovalent Na⁺ ion and trivalent Pr³⁺ ion or the deviation of the average Mn valency from 3.5+.

Original language	English
Pages (from-to)	935-940
Number of pages	6
Journal	Phase Transitions
Volume	75
Issue number	7-8
DOIs	https://doi.org/10.1080/01411590290034083
Publication status	Published - Jan 1 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation
Materials Science(all)

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title = "Irreversible photoinduced insulator-metal transition in charge ordered Pr0.75Na0.25MnO3",

abstract = "Irreversible photoinduced insulator-metal transition has been observed in a perovskite manganite doped with monovalent Na+, Pr 0.75Na0.25MnO3. The increase of the conductance is estimated to be of the order of 104-105, considering the shallow penetration depth (∼0.1 μm) of illumination light. Analysis of the dc- and ac-susceptibility data shows that the system is in a cluster glass state below 45K, which means that ferromagnetic metallic clusters exist in insulating matrix. The photo-excitation helps the clusters to dislodge from a local energy minimum and to seek more stable configuration. The observed large increase of the conductivity can be well explained by the percolative conduction. We argue that metastability is due to the large charge mismatch between the monovalent Na+ ion and trivalent Pr3+ ion or the deviation of the average Mn valency from 3.5+.",

author = "T. Satoh and Y. Kikuchi and K. Miyano and E. Pollert and J. Hejtm{\'a}nek and Z. Jir{\'a}k",

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T1 - Irreversible photoinduced insulator-metal transition in charge ordered Pr0.75Na0.25MnO3

AU - Satoh, T.

AU - Kikuchi, Y.

AU - Miyano, K.

AU - Pollert, E.

AU - Hejtmánek, J.

AU - Jirák, Z.

PY - 2002/1/1

Y1 - 2002/1/1

N2 - Irreversible photoinduced insulator-metal transition has been observed in a perovskite manganite doped with monovalent Na+, Pr 0.75Na0.25MnO3. The increase of the conductance is estimated to be of the order of 104-105, considering the shallow penetration depth (∼0.1 μm) of illumination light. Analysis of the dc- and ac-susceptibility data shows that the system is in a cluster glass state below 45K, which means that ferromagnetic metallic clusters exist in insulating matrix. The photo-excitation helps the clusters to dislodge from a local energy minimum and to seek more stable configuration. The observed large increase of the conductivity can be well explained by the percolative conduction. We argue that metastability is due to the large charge mismatch between the monovalent Na+ ion and trivalent Pr3+ ion or the deviation of the average Mn valency from 3.5+.

AB - Irreversible photoinduced insulator-metal transition has been observed in a perovskite manganite doped with monovalent Na+, Pr 0.75Na0.25MnO3. The increase of the conductance is estimated to be of the order of 104-105, considering the shallow penetration depth (∼0.1 μm) of illumination light. Analysis of the dc- and ac-susceptibility data shows that the system is in a cluster glass state below 45K, which means that ferromagnetic metallic clusters exist in insulating matrix. The photo-excitation helps the clusters to dislodge from a local energy minimum and to seek more stable configuration. The observed large increase of the conductivity can be well explained by the percolative conduction. We argue that metastability is due to the large charge mismatch between the monovalent Na+ ion and trivalent Pr3+ ion or the deviation of the average Mn valency from 3.5+.

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Irreversible photoinduced insulator-metal transition in charge ordered Pr_0.75Na_0.25MnO₃

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