Nuclear spin relaxation in the organic superconductors (BEDT-TTF)4Hg2.78Cl8 and (BEDT-TTF)4Hg2.89Br8

A. V. Skripov; A. P. Stepanov; I. Heinmaa; A. Vainrub; R. N. Lyubovskaya; M. Z. Aldoshina

doi:10.1016/0921-4534(90)90626-P

Nuclear spin relaxation in the organic superconductors (BEDT-TTF)₄Hg_2.78Cl₈ and (BEDT-TTF)₄Hg_2.89Br₈

A. V. Skripov, A. P. Stepanov, I. Heinmaa, A. Vainrub, R. N. Lyubovskaya, M. Z. Aldoshina

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Abstract

The behavior of the proton spin-lattice relaxation rate T^-1₁ in the organic superconductors (BEDT-TTF)₄Hg_2.78Cl₈ (I) and (BEDT-TTF)₄Hg_2.89Br₈ (II) is studied over the ranges of temperature 4.5≤T≤300 K and resonance frequency 33≤v≤360 MHz. At T<150 K we have found a strong frequency dependence of T^-1₁ in II with a maximum between 90 and 200 MHz. This unusual frequency dependence can be explained by cross-relaxation via quadrupolar Br nuclei. The temperature dependence of T^-1₁ in both I and II at low temperatures is found to be non-Korringa.

Original language	English (US)
Pages (from-to)	340-344
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	172
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(90)90626-P
State	Published - Dec 15 1990

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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title = "Nuclear spin relaxation in the organic superconductors (BEDT-TTF)4Hg2.78Cl8 and (BEDT-TTF)4Hg2.89Br8",

abstract = "The behavior of the proton spin-lattice relaxation rate T-11 in the organic superconductors (BEDT-TTF)4Hg2.78Cl8 (I) and (BEDT-TTF)4Hg2.89Br8 (II) is studied over the ranges of temperature 4.5≤T≤300 K and resonance frequency 33≤v≤360 MHz. At T<150 K we have found a strong frequency dependence of T-11 in II with a maximum between 90 and 200 MHz. This unusual frequency dependence can be explained by cross-relaxation via quadrupolar Br nuclei. The temperature dependence of T-11 in both I and II at low temperatures is found to be non-Korringa.",

author = "Skripov, {A. V.} and Stepanov, {A. P.} and I. Heinmaa and A. Vainrub and Lyubovskaya, {R. N.} and Aldoshina, {M. Z.}",

year = "1990",

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doi = "10.1016/0921-4534(90)90626-P",

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T1 - Nuclear spin relaxation in the organic superconductors (BEDT-TTF)4Hg2.78Cl8 and (BEDT-TTF)4Hg2.89Br8

AU - Skripov, A. V.

AU - Stepanov, A. P.

AU - Heinmaa, I.

AU - Vainrub, A.

AU - Lyubovskaya, R. N.

AU - Aldoshina, M. Z.

PY - 1990/12/15

Y1 - 1990/12/15

N2 - The behavior of the proton spin-lattice relaxation rate T-11 in the organic superconductors (BEDT-TTF)4Hg2.78Cl8 (I) and (BEDT-TTF)4Hg2.89Br8 (II) is studied over the ranges of temperature 4.5≤T≤300 K and resonance frequency 33≤v≤360 MHz. At T<150 K we have found a strong frequency dependence of T-11 in II with a maximum between 90 and 200 MHz. This unusual frequency dependence can be explained by cross-relaxation via quadrupolar Br nuclei. The temperature dependence of T-11 in both I and II at low temperatures is found to be non-Korringa.

AB - The behavior of the proton spin-lattice relaxation rate T-11 in the organic superconductors (BEDT-TTF)4Hg2.78Cl8 (I) and (BEDT-TTF)4Hg2.89Br8 (II) is studied over the ranges of temperature 4.5≤T≤300 K and resonance frequency 33≤v≤360 MHz. At T<150 K we have found a strong frequency dependence of T-11 in II with a maximum between 90 and 200 MHz. This unusual frequency dependence can be explained by cross-relaxation via quadrupolar Br nuclei. The temperature dependence of T-11 in both I and II at low temperatures is found to be non-Korringa.

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Nuclear spin relaxation in the organic superconductors (BEDT-TTF)₄Hg_2.78Cl₈ and (BEDT-TTF)₄Hg_2.89Br₈

Abstract

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