X-ray irradiation effect on magnetic properties of Dimer-Mott insulators: κ-(BEDT-TTF)2Cu[N(CN)2]Cl and β'-(BEDT-TTF) 2ICl2

Naoki Yoneyama; Takahiko Sasaki; Norio Kobayashi; Ko Furukawa; Toshikazu Nakamura

doi:10.1016/j.physb.2009.10.043

X-ray irradiation effect on magnetic properties of Dimer-Mott insulators: κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl and β'-(BEDT-TTF) ₂ICl₂

Naoki Yoneyama, Takahiko Sasaki, Norio Kobayashi, Ko Furukawa, Toshikazu Nakamura

Institute for Materials Research (IMR)

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

11 Citations (Scopus)

Abstract

We report the X-ray irradiation dose dependence of the magnetic susceptibility in κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl (κ-Cl) and β'-(BEDT-TTF)₂ICl₂ (β'-ICl ₂). The Néel temperature of 27.5 K in κ-Cl reduces to 24.0 K after irradiation of 240 MGy, while that of 22.0K in β'-ICl ₂ does not vary. Taking account of the suppressed amplitude of the dicyanamide vibration modes in the infrared spectra of the irradiated κ-Cl, we suggest that X-ray irradiation modifies the anion structure related to the CN group, which does not hold in β'-ICl₂.

Original language	English
Pages (from-to)	S244-S246
Journal	Physica B: Condensed Matter
Volume	405
Issue number	11 SUPPL.
DOIs	https://doi.org/10.1016/j.physb.2009.10.043
Publication status	Published - 2010 Jun 1

Keywords

Carrier doping
Mott insulator
X-ray irradiation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "X-ray irradiation effect on magnetic properties of Dimer-Mott insulators: κ-(BEDT-TTF)2Cu[N(CN)2]Cl and β'-(BEDT-TTF) 2ICl2",

abstract = "We report the X-ray irradiation dose dependence of the magnetic susceptibility in κ-(BEDT-TTF)2Cu[N(CN)2]Cl (κ-Cl) and β'-(BEDT-TTF)2ICl2 (β'-ICl 2). The N{\'e}el temperature of 27.5 K in κ-Cl reduces to 24.0 K after irradiation of 240 MGy, while that of 22.0K in β'-ICl 2 does not vary. Taking account of the suppressed amplitude of the dicyanamide vibration modes in the infrared spectra of the irradiated κ-Cl, we suggest that X-ray irradiation modifies the anion structure related to the CN group, which does not hold in β'-ICl2.",

keywords = "Carrier doping, Mott insulator, X-ray irradiation",

author = "Naoki Yoneyama and Takahiko Sasaki and Norio Kobayashi and Ko Furukawa and Toshikazu Nakamura",

year = "2010",

month = jun,

day = "1",

doi = "10.1016/j.physb.2009.10.043",

language = "English",

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TY - JOUR

T1 - X-ray irradiation effect on magnetic properties of Dimer-Mott insulators

T2 - κ-(BEDT-TTF)2Cu[N(CN)2]Cl and β'-(BEDT-TTF) 2ICl2

AU - Yoneyama, Naoki

AU - Sasaki, Takahiko

AU - Kobayashi, Norio

AU - Furukawa, Ko

AU - Nakamura, Toshikazu

PY - 2010/6/1

Y1 - 2010/6/1

N2 - We report the X-ray irradiation dose dependence of the magnetic susceptibility in κ-(BEDT-TTF)2Cu[N(CN)2]Cl (κ-Cl) and β'-(BEDT-TTF)2ICl2 (β'-ICl 2). The Néel temperature of 27.5 K in κ-Cl reduces to 24.0 K after irradiation of 240 MGy, while that of 22.0K in β'-ICl 2 does not vary. Taking account of the suppressed amplitude of the dicyanamide vibration modes in the infrared spectra of the irradiated κ-Cl, we suggest that X-ray irradiation modifies the anion structure related to the CN group, which does not hold in β'-ICl2.

AB - We report the X-ray irradiation dose dependence of the magnetic susceptibility in κ-(BEDT-TTF)2Cu[N(CN)2]Cl (κ-Cl) and β'-(BEDT-TTF)2ICl2 (β'-ICl 2). The Néel temperature of 27.5 K in κ-Cl reduces to 24.0 K after irradiation of 240 MGy, while that of 22.0K in β'-ICl 2 does not vary. Taking account of the suppressed amplitude of the dicyanamide vibration modes in the infrared spectra of the irradiated κ-Cl, we suggest that X-ray irradiation modifies the anion structure related to the CN group, which does not hold in β'-ICl2.

KW - Carrier doping

KW - Mott insulator

KW - X-ray irradiation

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