scholarly journals Comparison of Pr-doped Ca 122 and Ca 112 Pnictides by Low-field Microwave Absorption Spectroscopy

2014 ◽  
Vol 1684 ◽  
Author(s):  
Austin R. Howard ◽  
Jonathan D. Yuen ◽  
Bing Lv ◽  
Myron Salamon ◽  
Ching-Wu Chu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Microwave Absorption ◽  
Absorption Spectroscopy ◽  
Superconducting State ◽  
Superconducting Phase ◽  
Interfacial Phase ◽  
Low Field ◽  
Low Magnetic Field ◽  
Anisotropic Magnetization

ABSTRACTPraseodymium doped CaFe2As2 (122 structure) and CaFeAs2 (112 structure) are characterized by modulated Low Magnetic Field Microwave Absorption (LFMA) spectroscopy. In both (Pr,Ca)122 and (Pr,Ca)112 structures, a strong hysteretic LFMA is found, with a TcH of ∼30 K and ∼26 K, respectively. However, in (Pr,Ca)122, measurements also show an unusual Narrow Peak (NP) LFMA signal appearing at higher temperatures, above the lower TcH superconducting state until a TcNP of 49 K. We associate this NP LFMA with interfacial superconductivity, which has been found previously by highly anisotropic magnetization measurements. Furthermore, the absence of NP in (Pr,Ca)112 correlates with the absence of an interfacial phase. These results give useful information about the microwave signature of interfacial superconductivity present in the (Pr,Ca)122 system, and may form a roadmap towards a stabilized high temperature superconducting phase in pnictides.

Low-Field Microwave Absorption in High-TC Superconducting Oxides

1987 ◽  
Vol 99 ◽  
Author(s):  
B. L. Ramakrishna ◽  
E. W. Ong ◽  
Z. Iqbal
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
Composite Material ◽  
Microwave Absorption ◽  
Superconducting State ◽  
Microwave Power ◽  
Modulation Amplitude ◽  
High Tc ◽  
Low Field ◽  
Superconducting Oxides

ABSTRACTLow-field non-resonant microwave absorption in an EPR spectrometer has been observed in the superconducting state of different samples of the new high-T oxides, YBa2Cu3O7-δ and La1.8Sr0.2CuO4. It has been attributed to flux slippage occurring at the Josephson junctions existing in the granular composite material. The dependence on particle size, temperature, microwave power, DC modulation amplitude and magnetic field has been studied.

Flux trapping on multi-superconducting phase PAT12-C60Rb composite: Low-field microwave absorption study

1997 ◽  
Vol 103 (11) ◽  
pp. 607-614 ◽  
Author(s):  
Hisashi Araki ◽  
Hirotake Kajii ◽  
Kazuya Tada ◽  
Anvar A. Zakhidov ◽  
Kyuya Yakushi ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Superconducting Phase ◽  
Absorption Study ◽  
Low Field ◽  
Flux Trapping

Microwave absorption at low-magnetic-field scanning on smallYBa2Cu3Oyparticles embedded in a KBr matrix

1993 ◽  
Vol 48 (13) ◽  
pp. 9763-9766
Author(s):  
K. Kawabata ◽  
Y. Shono ◽  
S. Tsukui ◽  
H. Hase ◽  
K. Ishioka
Keyword(s):  
Magnetic Field ◽  
Microwave Absorption ◽  
Low Magnetic Field

Low magnetic field superconducting phase diagram of the high-Tc YBa2Cu3O9-δ

1987 ◽  
Vol 64 (4) ◽  
pp. 509-511 ◽  
Author(s):  
John E. Drumheller ◽  
Gerald V. Rubenacker ◽  
W.K. Ford ◽  
J. Anderson ◽  
M. Hong ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
Superconducting Phase ◽  
High Tc ◽  
Low Magnetic Field

MICROWAVE ABSORPTION STUDIES ON HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS I—LOW-FIELD MICROWAVE ABSORPTION IN A BiSrCaCuO THIN FILM DEPOSITED BY MOCVD

1991 ◽  
Vol 05 (09) ◽  
pp. 667-674 ◽  
Author(s):  
K. SUGAWARA ◽  
T. SUGIMOTO ◽  
K. YASUIKE ◽  
D.J. BAAR ◽  
Y. SHIOHARA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Microwave Absorption ◽  
Applied Field ◽  
Film Plane ◽  
Experimental Results ◽  
High Tc Superconductors ◽  
High Tc ◽  
Low Field ◽  
Absorption Studies

Non-resonant microwave absorption as a function of temperature and magnetic field has been studied in a Bi-Sr-Ca-Cu-O film prepared by MOCVD. A maximum in the absorption as a function of temperature was observed at approximately 60 K. An average Josephson loop diameter of about 0.9~1.5 microns was inferred from the experimental results. The absorption was found to depend on the angle of the film plane relative to the applied field.

Sign in / Sign up

Export Citation Format

Share Document