Microwave absorption studies on high-Tc superconductors and related materials X-ESR of Gd in Y-Ba-Cu-O between about T[sub c] and 600[degrees]C

Journal Article · Tue Oct 20 04:00:00 EDT 1992 · Modern Physics Letters B; (Singapore)

DOI:https://doi.org/10.1142/S021798499200123X· OSTI ID:6719656

Sugawara, K; Tanaka, S ^[1]

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1. Superconductivity Research Lab., ISTEC, 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135 (Japan)

In this paper, temperature dependence of ESR linewidth, [Delta]H[sub pp], of Gd[sup 3+] in Y[sub 1] [minus] x Gd[sub x] Ba[sub 2]Cu[sub 3]O[sub y] (x = 0.2, 0.5 and 1) is studied between about T[sub c] (zero-resistance temperature) and about 600[degrees] C. For all the samples, [Delta]H[sub pp] progressively broadens as temperature approaches T[sub c] from high temperature side, presumably due to inhomogeneous magnetic field distributions arising from superconductivity. On the contrary, [Delta]H[sub pp] is nearly linear in temperature between about 100 K and 600 K with temperature gradient, (j)([Delta]H[sub pp])/(j)T [approx] 0.6 G/deg. The linear temperature dependence is assumed to be due to the Korringa relation. From the temperature gradient obtained above, JN(E[sub F]) was estimated as 0.0025, where J is the coupling coefficient between GD spin S and conduction carrier's spin S, and N(E[sub F]) is the density of states on the Fermi surface. In addition, by substituting an appropriate value for J, N(E[sub F]) was crudely estimated for the Y-Gd-Ba-Cu-O system.

• OSTI ID: 6719656
• Journal Information: Modern Physics Letters B; (Singapore), Journal Name: Modern Physics Letters B; (Singapore) Vol. 6:24; ISSN 0217-9849; ISSN MPLBET
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
ANGULAR MOMENTUM
BARIUM COMPOUNDS
CHARGE CARRIERS
CHARGED PARTICLES
COPPER COMPOUNDS
CUPRATES
ELECTRON SPIN RESONANCE
ENERGY LEVELS
FERMI LEVEL
GADOLINIUM COMPOUNDS
GADOLINIUM IONS
HIGH-TC SUPERCONDUCTORS
IONS
LINE WIDTHS
MAGNETIC RESONANCE
MICROWAVE SPECTRA
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RESONANCE
SPECTRA
SPIN
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE GRADIENTS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS