Suppressed Coherence due to Orbital Correlations in the Ferromagnetically Ordered Metallic Phase of Mn Compounds

Masatoshi Imada

doi:10.1143/JPSJ.67.45

Suppressed Coherence due to Orbital Correlations in the Ferromagnetically Ordered Metallic Phase of Mn Compounds

Masatoshi Imada^*

^*Corresponding author for this work

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

Abstract

Small Drude weight D together with small specific heat coefficient γ observed in the ferromagnetic phase of R_1-xA_xMnO₃ (R=La, Pr, Nd, Sm; A=Ca, Sr, Ba) are analyzed in terms of a proximity effect of the Mott insulator. The scaling theory for the metal-insulator transition with the critical enhancement of orbital correlations toward the staggered ordering of two e_g orbitals such as 3x² - r² and 3y² - r² symmetries may lead to the critical exponents of D ∞ δ^u and γ ∞ δ^v with u = 3/2 and v = 0. The result agrees with the experimental indications.

Original language	English
Pages (from-to)	45-48
Number of pages	4
Journal	journal of the physical society of japan
Volume	67
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.67.45
Publication status	Published - 1998 Jan
Externally published	Yes

Keywords

Anisotropic hyperscaling
Colossal magnetoresistance
Incoherent metal
LaMnO
Metal-insulator transition
Mott transition
Orbital correlation
Orbital order
Quantum critical phenomena
Scaling theory
Specific heat
Transition metal oxides

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.67.45

Cite this

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title = "Suppressed Coherence due to Orbital Correlations in the Ferromagnetically Ordered Metallic Phase of Mn Compounds",

abstract = "Small Drude weight D together with small specific heat coefficient γ observed in the ferromagnetic phase of R1-xAxMnO3 (R=La, Pr, Nd, Sm; A=Ca, Sr, Ba) are analyzed in terms of a proximity effect of the Mott insulator. The scaling theory for the metal-insulator transition with the critical enhancement of orbital correlations toward the staggered ordering of two eg orbitals such as 3x2 - r2 and 3y2 - r2 symmetries may lead to the critical exponents of D ∞ δu and γ ∞ δv with u = 3/2 and v = 0. The result agrees with the experimental indications.",

keywords = "Anisotropic hyperscaling, Colossal magnetoresistance, Incoherent metal, LaMnO, Metal-insulator transition, Mott transition, Orbital correlation, Orbital order, Quantum critical phenomena, Scaling theory, Specific heat, Transition metal oxides",

author = "Masatoshi Imada",

year = "1998",

month = jan,

doi = "10.1143/JPSJ.67.45",

language = "English",

volume = "67",

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journal = "Journal of the Physical Society of Japan",

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publisher = "Physical Society of Japan",

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T1 - Suppressed Coherence due to Orbital Correlations in the Ferromagnetically Ordered Metallic Phase of Mn Compounds

AU - Imada, Masatoshi

PY - 1998/1

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N2 - Small Drude weight D together with small specific heat coefficient γ observed in the ferromagnetic phase of R1-xAxMnO3 (R=La, Pr, Nd, Sm; A=Ca, Sr, Ba) are analyzed in terms of a proximity effect of the Mott insulator. The scaling theory for the metal-insulator transition with the critical enhancement of orbital correlations toward the staggered ordering of two eg orbitals such as 3x2 - r2 and 3y2 - r2 symmetries may lead to the critical exponents of D ∞ δu and γ ∞ δv with u = 3/2 and v = 0. The result agrees with the experimental indications.

AB - Small Drude weight D together with small specific heat coefficient γ observed in the ferromagnetic phase of R1-xAxMnO3 (R=La, Pr, Nd, Sm; A=Ca, Sr, Ba) are analyzed in terms of a proximity effect of the Mott insulator. The scaling theory for the metal-insulator transition with the critical enhancement of orbital correlations toward the staggered ordering of two eg orbitals such as 3x2 - r2 and 3y2 - r2 symmetries may lead to the critical exponents of D ∞ δu and γ ∞ δv with u = 3/2 and v = 0. The result agrees with the experimental indications.

KW - Anisotropic hyperscaling

KW - Colossal magnetoresistance

KW - Incoherent metal

KW - LaMnO

KW - Metal-insulator transition

KW - Mott transition

KW - Orbital correlation

KW - Orbital order

KW - Quantum critical phenomena

KW - Scaling theory

KW - Specific heat

KW - Transition metal oxides

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JF - Journal of the Physical Society of Japan

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Suppressed Coherence due to Orbital Correlations in the Ferromagnetically Ordered Metallic Phase of Mn Compounds

Abstract

Keywords

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