Absorption at radio frequencies in superconducting Y1Ba2Cu3Oy

The large magnetic‐field‐dependent ac absorption in superconducting Y1 Ba2 Cu3 Oy ceramics and powders decreases slowly with increasing frequency in the range 2–16 MHz. The magnetic‐field‐dependent ac absorption is observed below Tc in superconducting Y1 Ba2 Cu3 Oy ceramics, powders and twinned crystals and in (La,Sr)2 CuO4 and BaPb0.75 Bi 0.25 CuO3 powders and appears to contain distinct contributions from trapped flux and/or intragrain tunnel junctions and from ordinary superconductor surface impedance. The contribution from trapped flux and/or intragrain tunnel junctions is important in dc magnetic fields of up to approximately 20 G at all temperatures below Tc. There is an identifiable modulated ac absorption which changes slowly over more than 12 kG at low temperatures and which we propose is primarily caused by the ac surface impedance with possible contributions from the critical state. A twinned crystal of Y1 Ba2 Cu3 Oy exhibits the same ac absorption except that it has an anisotropic dependence o...

[1]  S. Ducharme,et al.  Absorption of microwaves in superconducting YBa 2 Cu 3 O 7 and field-cooling effects , 1989 .

[2]  S. Ducharme,et al.  Dissipative flow of Josephson and Abrikosov fluxons in high Tc superconductors , 1988 .

[3]  K. W. Blazey,et al.  Reduced fluxon viscosity in a Josephson junction , 1988 .

[4]  K. Müller,et al.  Macroscopic Flux Quantization and Microwave Excitation in Single-Crystal YBa2Cu3O7-δ , 1988 .

[5]  Malozemoff,et al.  Giant flux creep and irreversibility in an Y-Ba-Cu-O crystal: An alternative to the superconducting-glass model. , 1988, Physical review letters.

[6]  Osada,et al.  Microwave absorption studies of Y-Ba-Cu-O. , 1988, Physical review. B, Condensed matter.

[7]  B. F. Kim,et al.  A novel microwave technique for detection of superconductivity , 1988 .

[8]  J. Bednorz,et al.  Microwave study of the critical state in high-Tc superconductors , 1988 .

[9]  K. Müller,et al.  Low-field microwave absorption in the superconducting copper oxides. , 1987, Physical review. B, Condensed matter.

[10]  K. Müller,et al.  Origin of superconductive glassy state and extrinsic critical currents in high-Tc oxides. , 1987, Physical review letters.

[11]  E. Polturak,et al.  Measurement of the energy gap of YBa2Cu3O7 using ac susceptibility , 1987 .

[12]  Gallagher,et al.  Anisotropic nature of high-temperature superconductivity in single-crystal Y1Ba , 1987, Physical review letters.

[13]  G. Cui,et al.  Observations of the ac Josephson effect in Y-Ba-Cu-O superconductors at 77 K , 1987 .

[14]  Müller,et al.  Low-field magnetic relaxation effects in high-Tc superconductors Sr-La-Cu-O and Ba-La-Cu-O. , 1987, Physical review. B, Condensed matter.

[15]  Rettori,et al.  Magnetism and critical fields in the high-Tc superconductors YBa2Cu3O7-xSx (x=0,1): An ESR study. , 1987, Physical review. B, Condensed matter.

[16]  Michel,et al.  Twins and oriented domains in the orthorhombic superconductor YBa2Cu , 1987, Physical review. B, Condensed matter.

[17]  C. Rao,et al.  Absorption of electromagnetic radiation by superconducting YBa2Cu3O7: an oxygen-induced phenomenon , 1987 .

[18]  Taylor,et al.  Microwave absorption in the superconducting and normal phases of Y-Ba-Cu-O. , 1987, Physical review. B, Condensed matter.

[19]  Y. K. Huang,et al.  Macroscopic quantum phenomena in high-Tc superconducting material. , 1987, Physical review. B, Condensed matter.

[20]  D. Murphy,et al.  Bulk superconductivity at 91 K in single-phase oxygen-deficient perovskite Ba2YCu , 1987, Physical review letters.

[21]  J. Akimitsu,et al.  Superconducting Tunneling in Y-Ba-Cu-O System , 1987 .

[22]  T. Yabe,et al.  A Proposal for an Experiment to Compress and Amplify Ion Beam Pulse by Soft X-Ray Conversion , 1987 .

[23]  Chu,et al.  Superconductivity at 93 K in a new mixed-phase Yb-Ba-Cu-O compound system at ambient pressure. , 1987, Physical review letters.

[24]  K. Müller,et al.  Susceptibility Measurements Support High-Tc Superconductivity in the Ba-La-Cu-O System , 1987 .

[25]  Goldman,et al.  Time-dependent magnetization of a superconducting glass. , 1988, Physical review. B, Condensed matter.

[26]  E. Logothetis,et al.  Millimeter-wave absorption in La-Ba-Cu-O and Y-Ba-Cu-O superconductors. , 1988, Physical review. B, Condensed matter.

[27]  S. Ducharme,et al.  Absorption Component of the Magnetic Susceptibility in Superconducting YBa 2 Cu 3 O 7 , 1987 .

[28]  S. Ducharme,et al.  Frequency Dependence of the Absorption Component of the Magnetic Susceptibility in Superconducting Y1Ba2Cu3O7 , 1987 .

[29]  Stroud,et al.  Diamagnetic susceptibility of superconducting clusters: Spin-glass behavior. , 1985, Physical review. B, Condensed matter.

[30]  Michael Tinkham,et al.  Introduction to Superconductivity , 1975 .

[31]  P. D. Gennes,et al.  Superconductivity of metals and alloys , 1966 .