Search for new superconductors by magnetosensitive microwave absorption

Veĭnger, A. I.; Zabrodsky, A.G.; Tisnek, T. V.; Glebov, Leonid; Shchavelev, K. O.; Shchavelev, O. S.

doi:10.1016/0921-4534(94)92253-5

Physica C: Superconductivity

1994

DOI: 10.1016/0921-4534(94)92253-5

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Search for new superconductors by magnetosensitive microwave absorption

A. I. Veĭnger

A.G. Zabrodsky

T. V. Tisnek

et al.

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2000

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“…[7][8][9][10] Similar nonresonant microwave absorption signals were detected at low temperatures in borosilicate glasses doped with Cu, Ni, Co, and Fe in high concentrations ͑Ͼ10%͒. 11 The results in Ref. 11 were interpreted in terms of local superconductivity, however, no physical model of the electron mobility was suggested.…”

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confidence: 87%

Microwave response near zero magnetic field in transition-metal-doped silicate glasses

Рахимов

Ries

Jones

et al. 2000

Applied Physics Letters

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A sharp microwave response centered at zero magnetic field was observed in manganese- and iron-doped Na2O–CaO–MgO–SiO2 glasses with phase opposite to the normal Mn+2 and Fe+3 paramagnetic signals. The response can be described as magneto-induced microwave conductivity in the dielectric glass that derives from spin-dependent charge migration within the first coordination sphere of the paramagnetic ion. In contrast to the spin-polarized tunneling in ferromagnets between different valence states of metals, the observed effect is due to spin-dependent tunneling that occurs in the vicinity of manganese or iron in diluted paramagnetic systems.

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mentioning

confidence: 87%

Microwave response near zero magnetic field in transition-metal-doped silicate glasses

Рахимов

Ries

Jones

et al. 2000

Applied Physics Letters

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Zero-field signal in the electron paramagnetic resonance spectrum of Mn+2 in silicate glasses

Рахимов

Jones

2000

The Journal of Chemical Physics

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A 9.4–9.8 GHz electron paramagnetic resonance (EPR) study of Mn+2-doped Na2O–CaO–MgO–SiO2 glasses has revealed a nonresonant microwave magneto-absorption near zero magnetic field in addition to normal paramagnetic absorption due to Mn+2 ions, electron spin S=5/2. The low-field response has an opposite phase relative to paramagnetic signal and is independent of the mutual orientation of the magnetic field of the microwave H1 and static magnetic field H. In contrast, the paramagnetic signal is different for perpendicular H1⊥H and parallel H1∥H polarization of the microwave field, which is attributed to enhancement of forbidden magnetic dipolar transitions and suppression of the allowed transitions for parallel polarization. The low-field response is described in terms of microwave dielectric losses that derive from the magneto-induced charge migration in the first coordination sphere of Mn+2. As opposed to the spin-polarized tunneling that was described in ferromagnets between different valence forms of Mn, the observed effect is due to spin-dependent tunneling that occurs in the vicinity of Mn+2 in a diluted paramagnetic system.

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Search for new superconductors by magnetosensitive microwave absorption

Cited by 2 publications

References 2 publications

Microwave response near zero magnetic field in transition-metal-doped silicate glasses

Microwave response near zero magnetic field in transition-metal-doped silicate glasses

Zero-field signal in the electron paramagnetic resonance spectrum of Mn+2 in silicate glasses

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