Anomalies in static spin susceptibility and hydrogen bonding in high-Tc κ-(BEDT-TTF)2Cu(NCS)2: possible valence mixing of Cu ions

N. Toyota; T. Sasaki; H. Sato; Y. Watanabe

doi:10.1016/0921-4534(91)90082-A

Anomalies in static spin susceptibility and hydrogen bonding in high-T_c κ-(BEDT-TTF)₂Cu(NCS)₂: possible valence mixing of Cu ions

N. Toyota, T. Sasaki, H. Sato, Y. Watanabe

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

20 Citations (Scopus)

Abstract

The temperature dependence of the static spin susceptibility ξ_spin and the lattice parameters has been measured for a single crystal of the superconductor mentioned in the title. No magnetic anisotropy is found in ξ_spin (T), excluding the possibility of any magnetic ordering. The ξ_spin is almost constant down to 100 K, below which it starts to decrease, accompanied with a 20% reduction. The interlayer spacing d₁₀₀ takes a maximum around 100 K, which could be reduced to the change in the hydrogen-bonding distance between the terminal ethylene and the counter anion molecule -SCN-Cu-NCS-. Based on these anomalies with resistance maximum around 100 K, the valence mixing states of Cu¹⁺ and Cu²⁺ ions at high temperatures are postulated.

Original language	English
Pages (from-to)	339-344
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	178
Issue number	4-6
DOIs	https://doi.org/10.1016/0921-4534(91)90082-A
Publication status	Published - 1991 Aug 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(91)90082-A

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title = "Anomalies in static spin susceptibility and hydrogen bonding in high-Tc κ-(BEDT-TTF)2Cu(NCS)2: possible valence mixing of Cu ions",

abstract = "The temperature dependence of the static spin susceptibility ξspin and the lattice parameters has been measured for a single crystal of the superconductor mentioned in the title. No magnetic anisotropy is found in ξspin (T), excluding the possibility of any magnetic ordering. The ξspin is almost constant down to 100 K, below which it starts to decrease, accompanied with a 20% reduction. The interlayer spacing d100 takes a maximum around 100 K, which could be reduced to the change in the hydrogen-bonding distance between the terminal ethylene and the counter anion molecule -SCN-Cu-NCS-. Based on these anomalies with resistance maximum around 100 K, the valence mixing states of Cu1+ and Cu2+ ions at high temperatures are postulated.",

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T1 - Anomalies in static spin susceptibility and hydrogen bonding in high-Tc κ-(BEDT-TTF)2Cu(NCS)2

T2 - possible valence mixing of Cu ions

AU - Toyota, N.

AU - Sasaki, T.

AU - Sato, H.

AU - Watanabe, Y.

PY - 1991/8/1

Y1 - 1991/8/1

N2 - The temperature dependence of the static spin susceptibility ξspin and the lattice parameters has been measured for a single crystal of the superconductor mentioned in the title. No magnetic anisotropy is found in ξspin (T), excluding the possibility of any magnetic ordering. The ξspin is almost constant down to 100 K, below which it starts to decrease, accompanied with a 20% reduction. The interlayer spacing d100 takes a maximum around 100 K, which could be reduced to the change in the hydrogen-bonding distance between the terminal ethylene and the counter anion molecule -SCN-Cu-NCS-. Based on these anomalies with resistance maximum around 100 K, the valence mixing states of Cu1+ and Cu2+ ions at high temperatures are postulated.

AB - The temperature dependence of the static spin susceptibility ξspin and the lattice parameters has been measured for a single crystal of the superconductor mentioned in the title. No magnetic anisotropy is found in ξspin (T), excluding the possibility of any magnetic ordering. The ξspin is almost constant down to 100 K, below which it starts to decrease, accompanied with a 20% reduction. The interlayer spacing d100 takes a maximum around 100 K, which could be reduced to the change in the hydrogen-bonding distance between the terminal ethylene and the counter anion molecule -SCN-Cu-NCS-. Based on these anomalies with resistance maximum around 100 K, the valence mixing states of Cu1+ and Cu2+ ions at high temperatures are postulated.

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Anomalies in static spin susceptibility and hydrogen bonding in high-T_c κ-(BEDT-TTF)₂Cu(NCS)₂: possible valence mixing of Cu ions

Abstract

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