Unusual behavior of the Gd ESR in single crystals of GdyY1-yBa2Cu3O6+x with x=0.1-0.8 and y=0.03-0.06: Evidence for magnetic interaction in the superconductors

D. Shaltiel, Stewart Barnes, H. Bill, M. Francois, H. Hagemann, J. Jegondaz, D. Lovy, P. Monod, M. Peter, A. Revcolevschi, W. Sadowski, E. Walker

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Abstract

The ESR of small concentration of Gd 0.03yY1-yBa2Cu3O6-x has been measured. In the insulating compound, with x∼0.1, and the superdconducting materials with 30 K <Tc <80 K, the measurements were performed at X-band, 9.3 GHz, and Kα-band, 36 GHz, over a large temperature range above Tc. Angular dependence measurements exhibit a spectrum which is fully resolved in certain directions, but only partially resolved, because of exchange narrowing, in other directions. Comparisons between the spectra in the insulating and superconducting compounds shows similar angular dependent behavior. This seems to indicate that the origin of the exchange narrowing is the same in both compounds. Since this narrowing in the insulating compound arises from interaction with, or via, the Cu magnetic system, it is implied that there is a similar, perhaps fluctuating, system in the superconducting state. Preliminary measurements of the temperature dependence of the line widths may indicate the presence of spin pairing at about 110 K, above the actual Tc of 70 K. The crystal field parameters are D = 3B0 2 = 1307 MHz, B0 4 = 3.014 MHz and B4 4 = -11.43 MHz, for the semiconducting sample. The g-value is 1.989 0.005. These values change only slightly in the superconducting crystals.

Original languageEnglish (US)
Pages (from-to)13-20
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Volume161
Issue number1
DOIs
StatePublished - Oct 15 1989

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Superconducting materials
Paramagnetic resonance
Single crystals
Crystals
single crystals
Angle measurement
Linewidth
interactions
extremely high frequencies
superhigh frequencies
Temperature
crystal field theory
temperature dependence
crystals
Direction compound
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Unusual behavior of the Gd ESR in single crystals of GdyY1-yBa2Cu3O6+x with x=0.1-0.8 and y=0.03-0.06 : Evidence for magnetic interaction in the superconductors. / Shaltiel, D.; Barnes, Stewart; Bill, H.; Francois, M.; Hagemann, H.; Jegondaz, J.; Lovy, D.; Monod, P.; Peter, M.; Revcolevschi, A.; Sadowski, W.; Walker, E.

In: Physica C: Superconductivity and its Applications, Vol. 161, No. 1, 15.10.1989, p. 13-20.

Research output: Contribution to journalArticle

Shaltiel, D. ; Barnes, Stewart ; Bill, H. ; Francois, M. ; Hagemann, H. ; Jegondaz, J. ; Lovy, D. ; Monod, P. ; Peter, M. ; Revcolevschi, A. ; Sadowski, W. ; Walker, E. / Unusual behavior of the Gd ESR in single crystals of GdyY1-yBa2Cu3O6+x with x=0.1-0.8 and y=0.03-0.06 : Evidence for magnetic interaction in the superconductors. In: Physica C: Superconductivity and its Applications. 1989 ; Vol. 161, No. 1. pp. 13-20.
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abstract = "The ESR of small concentration of Gd 0.03yY1-yBa2Cu3O6-x has been measured. In the insulating compound, with x∼0.1, and the superdconducting materials with 30 K <Tc <80 K, the measurements were performed at X-band, 9.3 GHz, and Kα-band, 36 GHz, over a large temperature range above Tc. Angular dependence measurements exhibit a spectrum which is fully resolved in certain directions, but only partially resolved, because of exchange narrowing, in other directions. Comparisons between the spectra in the insulating and superconducting compounds shows similar angular dependent behavior. This seems to indicate that the origin of the exchange narrowing is the same in both compounds. Since this narrowing in the insulating compound arises from interaction with, or via, the Cu magnetic system, it is implied that there is a similar, perhaps fluctuating, system in the superconducting state. Preliminary measurements of the temperature dependence of the line widths may indicate the presence of spin pairing at about 110 K, above the actual Tc of 70 K. The crystal field parameters are D = 3B0 2 = 1307 MHz, B0 4 = 3.014 MHz and B4 4 = -11.43 MHz, for the semiconducting sample. The g-value is 1.989 0.005. These values change only slightly in the superconducting crystals.",
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AU - Shaltiel, D.

AU - Barnes, Stewart

AU - Bill, H.

AU - Francois, M.

AU - Hagemann, H.

AU - Jegondaz, J.

AU - Lovy, D.

AU - Monod, P.

AU - Peter, M.

AU - Revcolevschi, A.

AU - Sadowski, W.

AU - Walker, E.

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N2 - The ESR of small concentration of Gd 0.03yY1-yBa2Cu3O6-x has been measured. In the insulating compound, with x∼0.1, and the superdconducting materials with 30 K <Tc <80 K, the measurements were performed at X-band, 9.3 GHz, and Kα-band, 36 GHz, over a large temperature range above Tc. Angular dependence measurements exhibit a spectrum which is fully resolved in certain directions, but only partially resolved, because of exchange narrowing, in other directions. Comparisons between the spectra in the insulating and superconducting compounds shows similar angular dependent behavior. This seems to indicate that the origin of the exchange narrowing is the same in both compounds. Since this narrowing in the insulating compound arises from interaction with, or via, the Cu magnetic system, it is implied that there is a similar, perhaps fluctuating, system in the superconducting state. Preliminary measurements of the temperature dependence of the line widths may indicate the presence of spin pairing at about 110 K, above the actual Tc of 70 K. The crystal field parameters are D = 3B0 2 = 1307 MHz, B0 4 = 3.014 MHz and B4 4 = -11.43 MHz, for the semiconducting sample. The g-value is 1.989 0.005. These values change only slightly in the superconducting crystals.

AB - The ESR of small concentration of Gd 0.03yY1-yBa2Cu3O6-x has been measured. In the insulating compound, with x∼0.1, and the superdconducting materials with 30 K <Tc <80 K, the measurements were performed at X-band, 9.3 GHz, and Kα-band, 36 GHz, over a large temperature range above Tc. Angular dependence measurements exhibit a spectrum which is fully resolved in certain directions, but only partially resolved, because of exchange narrowing, in other directions. Comparisons between the spectra in the insulating and superconducting compounds shows similar angular dependent behavior. This seems to indicate that the origin of the exchange narrowing is the same in both compounds. Since this narrowing in the insulating compound arises from interaction with, or via, the Cu magnetic system, it is implied that there is a similar, perhaps fluctuating, system in the superconducting state. Preliminary measurements of the temperature dependence of the line widths may indicate the presence of spin pairing at about 110 K, above the actual Tc of 70 K. The crystal field parameters are D = 3B0 2 = 1307 MHz, B0 4 = 3.014 MHz and B4 4 = -11.43 MHz, for the semiconducting sample. The g-value is 1.989 0.005. These values change only slightly in the superconducting crystals.

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