Microwave absorption at low magnetic field in sinteredYBa2Cu3O7: Freezing effects at low temperature and superconducting-glass model

1989 ◽  
Vol 40 (7) ◽  
pp. 4437-4441 ◽  
Author(s):  
M. Giura ◽  
R. Marcon ◽  
R. Fastampa
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Microwave Absorption ◽  
Glass Model ◽  
Low Magnetic Field

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

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.

scholarly journals Microscopic Observation of π Spin Polarization by d Localized Spin in λ Type BETS Based Organic Superconductors

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1055
Author(s):  
Ko-ichi Hiraki ◽  
Toshihiro Takahashi ◽  
Hiroshi Akiba ◽  
Yutaka Nishio ◽  
Biao Zhou
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Spin Polarization ◽  
Organic Superconductors ◽  
Exchange Field ◽  
Superconducting Transition ◽  
Nmr Spectrum ◽  
Fe Sites ◽  
Low Magnetic Field ◽  
Ga Doping

In this study, 77Se NMR measurements were carried out to detect the π spin polarization of the organic BETS (BETS = Bis(ethylenedithio)tetraselenafulvalene) molecule of the field induced superconductor, λ-(BETS)2Fe1−xGaxCl4, which shows a superconducting transition at relatively low magnetic field compared to the non-doped λ-(BETS)2FeCl4. From the analysis of the NMR spectrum at low temperature, it was clarified that the exchange interaction between π and 3d spins in the Ga doping system is smaller than that in the Fe salt. It is also clarified that the conduction π spins feel the “averaged” exchange field from the localized 3d spins at the dilute Fe sites.

MICROWAVE ABSORPTION STUDIES ON HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS V-ANOMALOUS BEHAVIOR OF LOW MAGNETIC FIELD MICROWAVE ABSORPTION IN AN ULTRA-THIN Bi-Sr-Ca-Cu-O FILM

1991 ◽  
Vol 05 (30) ◽  
pp. 1981-1987 ◽  
Author(s):  
K. SUGAWARA ◽  
T. SUGIMOTO ◽  
D.J. BAAR ◽  
Y. SHIOHARA ◽  
S. TANAKA
Keyword(s):  
Magnetic Field ◽  
Temperature Dependence ◽  
Microwave Absorption ◽  
Anomalous Behavior ◽  
High Tc Superconductors ◽  
High Tc ◽  
Absorption Studies ◽  
Signal Changes ◽  
Low Magnetic Field ◽  
Mgo Substrate

Non-resonant microwave absorption (NRMA) studies have been done on a 100 Å thick Bi-Sr-Ca-Cu-O film fabricated on MgO substrate by MOCVD. Temperature dependence of NRMA intensity reveals that the intensity becomes maximum at around 30 K, 40 K and 55 K, and minimum at around 35 K and 50 K. The sign (or phase) of the signal changes by passing through these intensity minimum temperatures. Furthermore, the linewidths of the NRMA signals anomalously increase in the vicinity of these temperatures.

EPR and low magnetic field microwave absorption in hafnium doped YBa2Cu3Oy

1989 ◽  
Vol 158 (3) ◽  
pp. 385-390 ◽  
Author(s):  
A.G. Vedeshwar ◽  
Md. Shahbuddin ◽  
Prem Chand ◽  
H.D. Bist ◽  
S.K. Agarwal ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Microwave Absorption ◽  
Low Magnetic Field
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