Formation of the sodium 1-D structures in doped NaCl by high energy electron irradiation

Cherkasov, F. G.; Mustafin, R. G.; L’vov, S.G.; Хайбуллин, Р. И.; Hartog, H. W. den; Vainshtein, D.I.; Vitol, A.Ya.

doi:10.1016/s0042-207x(98)00167-5

Cited by 4 publications

(11 citation statements)

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“…1b). These values are much larger than the electron-phonon linewidth of bulk sodium (6-7 G) but significantly smaller than the width for F-aggregate centers $35 G [3,4]. Exchange interaction between F-aggregate centers and the conduction electrons in the bottleneck regime results in a single ESR line with a linewidth of about 20 G (a description of the ESR results for heavily-irradiated samples with a defect model combined with a bottleneck effect was proposed in [9]).…”

Section: High Temperature (Range I)mentioning

confidence: 78%

“…1a), g ¼ 2.0014 (Fig. 1c), at the melting point the ESR linewidth increases by an amount of $5.5 G, an isotropic Knight shift K ¼ 0.11% (see [3,4]). The ESR linewidth depends on the defect state of the damaged crystals, and at 300 K our NaCl-K and NaCl-KBF 4 samples yield linewidths of 21 and 18 G, respectively (Fig.…”

Section: High Temperature (Range I)mentioning

confidence: 92%

“…In addition, there are paramagnetic F-and F-aggregates, which are coupled by exchange interactions to the conduction electrons in the nanoparticles. Above 160 K the NMR and ESR signals of NaCl-K and NaCl-KBF 4 show Pauli paramagnetism and the properties of the Na nanoparticles are similar to bulk sodium. A single ESR line is observed revealing exchange interaction between conduction electrons in the nano-particles and F-aggregates.…”

mentioning

confidence: 93%

“…There is considerable interest in electron-irradiated NaCl-X crystals (X ¼ K or KBF 4 ) since at high doses and large dose rates non-equilibrium structural changes appear and conducting channels, consisting of extremely small metallic sodium particles, might be formed [1][2][3][4]. The electronic and magnetic properties of these crystals are similar to those of quasi-onedimensional conducting and polymeric compound RbC 60 (see [5,6]).…”

Section: Introductionmentioning

confidence: 99%

“…The electronic and magnetic properties of these crystals are similar to those of quasi-onedimensional conducting and polymeric compound RbC 60 (see [5,6]). Indeed, NMR spin relaxation [3,4,7], conduction electron spin resonance (CESR) and differential scanning calorimetry (DSC) [2,8] all suggest that NaCl-X is an electrical conductor above 160 K. However, between 160 and 40 K a gradual decrease of the CESR susceptibility with decreasing temperature has been observed. This was interpreted as evidence for the transition of NaCl-K to a non-conductive charge-density-wave (CDW) state [3] and indicative of small antiferromagnetic (AF) spin fluctuations persisting in heavily irradiated NaCl-KBF 4 crystals up to 160 K [2].…”

Section: Introductionmentioning

confidence: 99%

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The ground state of metallic nano-structures in heavily irradiated NaCl-KBF 4

Cherkasov

L’vov

Тихонов

et al. 2002

Radiation Effects and Defects in Solids

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ESR, NMR and static magnetic susceptibility measurements of heavily irradiated NaCl-K and NaCl-KBF 4 are reported. Up to 10% of the NaCl-molecules are transformed into metallic Na nanoparticles and Cl 2 precipitates. In addition, there are paramagnetic F-and F-aggregates, which are coupled by exchange interactions to the conduction electrons in the nanoparticles. Above 160 K the NMR and ESR signals of NaCl-K and NaCl-KBF 4 show Pauli paramagnetism and the properties of the Na nanoparticles are similar to bulk sodium. A single ESR line is observed revealing exchange interaction between conduction electrons in the nano-particles and F-aggregates. The observed decrease of the ESR susceptibility with decreasing temperature is due to a metalinsulator transition. The conduction electrons are localized below 40 K and the above mentioned F-aggregate centers contribute significantly to the overall ESR signal. For NaCl-KBF 4 we observed that with decreasing temperature the ESR line shifts towards lower fields due to antiferromagnetic ordering and internal magnetic fields.

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Section: High Temperature (Range I)mentioning

confidence: 78%

Section: High Temperature (Range I)mentioning

confidence: 92%

mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The ground state of metallic nano-structures in heavily irradiated NaCl-KBF 4

Cherkasov

L’vov

Тихонов

et al. 2002

Radiation Effects and Defects in Solids

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Characterization of ultra‐heavily damaged NaCl

Hartog

Sugonyako

Vainshtein

et al. 2007

Phys. Status Solidi (c)

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In this paper we present the progress made to (i) characterize the defect state of ultra‐heavily damaged rock salt samples with up to more than 20 at% Na colloids, which had been irradiated with 0.5 MeV electrons at 100 ºC up to 104 MGy (1000 GRad), and (ii) understand their physical properties. The explanation of the observations, made by means of a variety of experimental techniques, is not trivial and often the results obtained with different experimental techniques lead to conflicting interpretations. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Metal$ndash$insulator and magnetic transitions in heavily irradiated NaCl$ndash$KBF4

Cherkasov

L’vov

Тихонов

et al. 2002

J. Phys.: Condens. Matter

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We have performed electron spin resonance (ESR), nuclear magnetic resonance (NMR) and static magnetic susceptibility measurements on heavily irradiated NaCl-KBF 4 single crystals in the temperature range 4.2 < T < 350 K. In these samples, up to about 10% of the NaCl molecules are transformed into extremely small metallic Na particles and Cl 2 precipitates. At high temperatures a oneline ESR signal, i.e. common mode due to strong exchange interaction between conduction electrons and F-aggregate centres, is observed. We propose that the smooth decrease of the ESR spin susceptibility with decreasing temperature, which can be as large as 50%, is due to a metal-insulator transition, taking place at about 40 K. In the same temperature range, the linewidth increases by 18±2 G with decreasing temperature. This anomalous broadening is explained by a reduction of the exchange narrowing at low temperatures. NMR spinlattice relaxation on 23 Na shows a Korringa-type behaviour down to 10 K, which suggests that the conducting phase in heavily irradiated NaCl-KBF 4 behaves as a three-dimensional metal. SQUID experiments have revealed antiferromagnetic ordering at 40 K and a ferromagnetic phase below 20 K. The nature of the observed effects is discussed.

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Formation of the sodium 1-D structures in doped NaCl by high energy electron irradiation

Cited by 4 publications

References 4 publications

The ground state of metallic nano-structures in heavily irradiated NaCl-KBF 4

The ground state of metallic nano-structures in heavily irradiated NaCl-KBF 4

Characterization of ultra‐heavily damaged NaCl

Metal$ndash$insulator and magnetic transitions in heavily irradiated NaCl$ndash$KBF4

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