Electronic states in magnetic fullerides studied by ESR under pressure

K. Mizoguchi; S. Kobayashi; M. Machino; H. Sakamoto; T. Kawamoto; M. Tokumoto; M. Kosaka; K. Tanigaki; A. Omerzu; D. Mihailovic

doi:10.1016/S0379-6779(02)00435-6

Electronic states in magnetic fullerides studied by ESR under pressure

K. Mizoguchi, S. Kobayashi, M. Machino, H. Sakamoto, T. Kawamoto, M. Tokumoto, M. Kosaka, K. Tanigaki, A. Omerzu, D. Mihailovic

Research output: Contribution to journal › Conference article › peer-review

Abstract

TDAE-C₆₀ and AC₆₀ are well known monoanion-C₆₀ compounds, where TDAE is tetrakis-dimethylaminoethylene and A is Rb or Cs. The former compound is the soft ferromagnet (FM) below 16 K and the latter is a [2 + 2]-cycloadduct 1D polymer with the antiferromagnetic (AF) ground state below 50 K. Although several mechanisms for the FM in TDAE-C₆₀ have been proposed, the present study under high pressures suggests the ordering of orbitals of Jahn-Teller distorted C₆₀. So far, AF transition below 50 K in RbC₆₀ has been interpreted as the metal-insulator transition driven by instability of half-filled 1D Fermi surface. However, the present study combined with the resistivity data under pressure revealed RbC₆₀ to be a 3D Mott-Hubbard system with the AF-metallic phase arising from magnetic frustration in a fcc-like structure.

Original language	English
Pages (from-to)	695-696
Number of pages	2
Journal	Synthetic Metals
Volume	133-134
DOIs	https://doi.org/10.1016/S0379-6779(02)00435-6
Publication status	Published - 2003 Mar 13
Externally published	Yes
Event	ISCOM 2001 - Rusutsu, Hokkaido, Japan Duration: 2001 Sept 10 → 2001 Sept 14

Keywords

ESR
Fullerides
Magnetic phase transition
Orbital order
Polymer
Pressure

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/S0379-6779(02)00435-6

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title = "Electronic states in magnetic fullerides studied by ESR under pressure",

abstract = "TDAE-C60 and AC60 are well known monoanion-C60 compounds, where TDAE is tetrakis-dimethylaminoethylene and A is Rb or Cs. The former compound is the soft ferromagnet (FM) below 16 K and the latter is a [2 + 2]-cycloadduct 1D polymer with the antiferromagnetic (AF) ground state below 50 K. Although several mechanisms for the FM in TDAE-C60 have been proposed, the present study under high pressures suggests the ordering of orbitals of Jahn-Teller distorted C60. So far, AF transition below 50 K in RbC60 has been interpreted as the metal-insulator transition driven by instability of half-filled 1D Fermi surface. However, the present study combined with the resistivity data under pressure revealed RbC60 to be a 3D Mott-Hubbard system with the AF-metallic phase arising from magnetic frustration in a fcc-like structure.",

keywords = "ESR, Fullerides, Magnetic phase transition, Orbital order, Polymer, Pressure",

author = "K. Mizoguchi and S. Kobayashi and M. Machino and H. Sakamoto and T. Kawamoto and M. Tokumoto and M. Kosaka and K. Tanigaki and A. Omerzu and D. Mihailovic",

note = "Funding Information: This work is partially supported by Grant-in-Aid for Scientific Research on the Priority Area “Fullerenes and Nanotubes” by the Ministry of Education, Science, Sports and Culture of Japan.; ISCOM 2001 ; Conference date: 10-09-2001 Through 14-09-2001",

year = "2003",

month = mar,

day = "13",

doi = "10.1016/S0379-6779(02)00435-6",

language = "English",

volume = "133-134",

pages = "695--696",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Electronic states in magnetic fullerides studied by ESR under pressure

AU - Mizoguchi, K.

AU - Kobayashi, S.

AU - Machino, M.

AU - Sakamoto, H.

AU - Kawamoto, T.

AU - Tokumoto, M.

AU - Kosaka, M.

AU - Tanigaki, K.

AU - Omerzu, A.

AU - Mihailovic, D.

N1 - Funding Information: This work is partially supported by Grant-in-Aid for Scientific Research on the Priority Area “Fullerenes and Nanotubes” by the Ministry of Education, Science, Sports and Culture of Japan.

PY - 2003/3/13

Y1 - 2003/3/13

N2 - TDAE-C60 and AC60 are well known monoanion-C60 compounds, where TDAE is tetrakis-dimethylaminoethylene and A is Rb or Cs. The former compound is the soft ferromagnet (FM) below 16 K and the latter is a [2 + 2]-cycloadduct 1D polymer with the antiferromagnetic (AF) ground state below 50 K. Although several mechanisms for the FM in TDAE-C60 have been proposed, the present study under high pressures suggests the ordering of orbitals of Jahn-Teller distorted C60. So far, AF transition below 50 K in RbC60 has been interpreted as the metal-insulator transition driven by instability of half-filled 1D Fermi surface. However, the present study combined with the resistivity data under pressure revealed RbC60 to be a 3D Mott-Hubbard system with the AF-metallic phase arising from magnetic frustration in a fcc-like structure.

AB - TDAE-C60 and AC60 are well known monoanion-C60 compounds, where TDAE is tetrakis-dimethylaminoethylene and A is Rb or Cs. The former compound is the soft ferromagnet (FM) below 16 K and the latter is a [2 + 2]-cycloadduct 1D polymer with the antiferromagnetic (AF) ground state below 50 K. Although several mechanisms for the FM in TDAE-C60 have been proposed, the present study under high pressures suggests the ordering of orbitals of Jahn-Teller distorted C60. So far, AF transition below 50 K in RbC60 has been interpreted as the metal-insulator transition driven by instability of half-filled 1D Fermi surface. However, the present study combined with the resistivity data under pressure revealed RbC60 to be a 3D Mott-Hubbard system with the AF-metallic phase arising from magnetic frustration in a fcc-like structure.

KW - ESR

KW - Fullerides

KW - Magnetic phase transition

KW - Orbital order

KW - Polymer

KW - Pressure

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U2 - 10.1016/S0379-6779(02)00435-6

DO - 10.1016/S0379-6779(02)00435-6

M3 - Conference article

AN - SCOPUS:0037435363

SN - 0379-6779

VL - 133-134

SP - 695

EP - 696

JO - Synthetic Metals

JF - Synthetic Metals

T2 - ISCOM 2001

Y2 - 10 September 2001 through 14 September 2001

ER -

Electronic states in magnetic fullerides studied by ESR under pressure

Abstract

Keywords

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