ESR study of coexisting superconducting phases in BiSrCaCuO ceramics: New features of the low-field microwave absorption

I. I. Khairullin; A. A. Zakhidov; P. K. Khabibullaev; Z. Iqbal; R. H. Baughman

doi:10.1016/0379-6779(89)90870-9

ESR study of coexisting superconducting phases in BiSrCaCuO ceramics: New features of the low-field microwave absorption

I. I. Khairullin, A. A. Zakhidov, P. K. Khabibullaev, Z. Iqbal, R. H. Baughman

Research output: Contribution to journal › Article › peer-review

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Abstract

The low-field signal (LFS) of microwave absorption and ESR spectra have been studied in multiphase BiSrCaCuO samples in which two superconducting phases with onset temperatures of 87 K and 112 K were found earlier by a.c. resistivity and d.c. magnetometry measurements. The temperature dependence of LFS intensity was found to be non-homogeneous with a characteristic step and peak-like features at 60 K, 87 K, 112 K and 116 K. These features are interpreted as evidence for the existence of two more superconducting phases: one with T_c = 116 K, that has not been previously observed in such samples, and other one with T_c = 60 K, that has already been identified in BiSrCaCuO samples prepared at lower temperatures. Comparison of the LFS behavior of BiSrCaCuO as a function of applied magnetic field and microwave power with that of YBa₂Cu₃O₇ indicates a more strongly coupled intergrain morphology and more complicated topology of weak links in the Bi-based superconductor. LFS is shown to be a very sensitive method for the detection and characterization of small superconducting fractions in both non-superconducting and superconducting multiphase matrices.

Original language	English (US)
Pages (from-to)	243-256
Number of pages	14
Journal	Synthetic Metals
Volume	33
Issue number	2
DOIs	https://doi.org/10.1016/0379-6779(89)90870-9
State	Published - Nov 15 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "ESR study of coexisting superconducting phases in BiSrCaCuO ceramics: New features of the low-field microwave absorption",

abstract = "The low-field signal (LFS) of microwave absorption and ESR spectra have been studied in multiphase BiSrCaCuO samples in which two superconducting phases with onset temperatures of 87 K and 112 K were found earlier by a.c. resistivity and d.c. magnetometry measurements. The temperature dependence of LFS intensity was found to be non-homogeneous with a characteristic step and peak-like features at 60 K, 87 K, 112 K and 116 K. These features are interpreted as evidence for the existence of two more superconducting phases: one with Tc = 116 K, that has not been previously observed in such samples, and other one with Tc = 60 K, that has already been identified in BiSrCaCuO samples prepared at lower temperatures. Comparison of the LFS behavior of BiSrCaCuO as a function of applied magnetic field and microwave power with that of YBa2Cu3O7 indicates a more strongly coupled intergrain morphology and more complicated topology of weak links in the Bi-based superconductor. LFS is shown to be a very sensitive method for the detection and characterization of small superconducting fractions in both non-superconducting and superconducting multiphase matrices.",

author = "Khairullin, {I. I.} and Zakhidov, {A. A.} and Khabibullaev, {P. K.} and Z. Iqbal and Baughman, {R. H.}",

year = "1989",

month = nov,

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doi = "10.1016/0379-6779(89)90870-9",

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T1 - ESR study of coexisting superconducting phases in BiSrCaCuO ceramics

T2 - New features of the low-field microwave absorption

AU - Khairullin, I. I.

AU - Zakhidov, A. A.

AU - Khabibullaev, P. K.

AU - Iqbal, Z.

AU - Baughman, R. H.

PY - 1989/11/15

Y1 - 1989/11/15

N2 - The low-field signal (LFS) of microwave absorption and ESR spectra have been studied in multiphase BiSrCaCuO samples in which two superconducting phases with onset temperatures of 87 K and 112 K were found earlier by a.c. resistivity and d.c. magnetometry measurements. The temperature dependence of LFS intensity was found to be non-homogeneous with a characteristic step and peak-like features at 60 K, 87 K, 112 K and 116 K. These features are interpreted as evidence for the existence of two more superconducting phases: one with Tc = 116 K, that has not been previously observed in such samples, and other one with Tc = 60 K, that has already been identified in BiSrCaCuO samples prepared at lower temperatures. Comparison of the LFS behavior of BiSrCaCuO as a function of applied magnetic field and microwave power with that of YBa2Cu3O7 indicates a more strongly coupled intergrain morphology and more complicated topology of weak links in the Bi-based superconductor. LFS is shown to be a very sensitive method for the detection and characterization of small superconducting fractions in both non-superconducting and superconducting multiphase matrices.

AB - The low-field signal (LFS) of microwave absorption and ESR spectra have been studied in multiphase BiSrCaCuO samples in which two superconducting phases with onset temperatures of 87 K and 112 K were found earlier by a.c. resistivity and d.c. magnetometry measurements. The temperature dependence of LFS intensity was found to be non-homogeneous with a characteristic step and peak-like features at 60 K, 87 K, 112 K and 116 K. These features are interpreted as evidence for the existence of two more superconducting phases: one with Tc = 116 K, that has not been previously observed in such samples, and other one with Tc = 60 K, that has already been identified in BiSrCaCuO samples prepared at lower temperatures. Comparison of the LFS behavior of BiSrCaCuO as a function of applied magnetic field and microwave power with that of YBa2Cu3O7 indicates a more strongly coupled intergrain morphology and more complicated topology of weak links in the Bi-based superconductor. LFS is shown to be a very sensitive method for the detection and characterization of small superconducting fractions in both non-superconducting and superconducting multiphase matrices.

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ESR study of coexisting superconducting phases in BiSrCaCuO ceramics: New features of the low-field microwave absorption

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