AC susceptibility studies of grain-aligned superconductors by grained Bean model

Three radical cation salts of BDH-TTP with the paramagnetic [ReF6]2− and diamagnetic [ReO4]− anions have been synthesized: κ-(BDH-TTP)4ReF6 (1), κ-(BDH-TTP)4ReF6·4.8H2O (2) and pseudo-κ″-(BDH-TTP)3(ReO4)2 (3). The crystal and band structures, as well as the conducting properties of the salts, have been studied. The structures of the three salts are layered and characterized by alternating κ-(1, 2) and κ″-(3) type organic radical cation layers with inorganic anion sheets. Similar to other κ-salts, the conducting layers in the crystals of 1 and 2 are formed by BDH-TTP dimers. The partial population of positions of Re atoms and disorder in the anionic layers of 1–3 are their distinctive features. Compounds 1 and 2 show the metallic character of conductivity down to low temperatures, while 3 is a semiconductor. The ac susceptibility of crystals 1 was investigated in order to test the possible slow relaxation of magnetization associated with the [ReF6]2− anion.

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Crystallographic structure and magnetic ordering inCaMn1−xRuxO3(x⩽0.40)manganites: Neutron diffraction, ac susceptibility, and electron magnetic resonance studies

Physical Review B ◽

10.1103/physrevb.70.134433 ◽

2004 ◽

Vol 70 (13) ◽

Cited By ~ 29

Author(s):

A. I. Shames ◽

E. Rozenberg ◽

C. Martin ◽

A. Maignan ◽

B. Raveau ◽

...

Keyword(s):

Magnetic Resonance ◽

Neutron Diffraction ◽

Ac Susceptibility ◽

Magnetic Ordering ◽

Electron Magnetic Resonance ◽

Crystallographic Structure ◽

Magnetic Resonance Studies

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Temperature dependence of AC-susceptibility and resistivity of AS-cast and annealed Fe73Al5Ga2P11C5B4 ribbon

Journal of Magnetism and Magnetic Materials ◽

10.1016/s0304-8853(00)00129-3 ◽

2000 ◽

Vol 215-216 ◽

pp. 260-263 ◽

Cited By ~ 2

Author(s):

H Sassik ◽

M Schönhart ◽

R Grössinger ◽

R Sato Turtelli ◽

A Kottar

Keyword(s):

Temperature Dependence ◽

Ac Susceptibility

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INTERGRANULAR PROPERTIES OF (Y1-x-yZrxCay)Ba2Cu3O7-δ COMPOUNDS

International Journal of Modern Physics B ◽

10.1142/s0217979299001624 ◽

1999 ◽

Vol 13 (13) ◽

pp. 1645-1654 ◽

Cited By ~ 9

Author(s):

I. GR. DEAC ◽

E. BURZO ◽

A. V. POP ◽

V. POP ◽

R. TETEAN ◽

...

Keyword(s):

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Ac Susceptibility ◽

Temperature Dependent ◽

Susceptibility Data ◽

Dc Magnetic Field ◽

Complex Susceptibility ◽

Granular Superconductors ◽

Intergranular Critical Current Density

The intergranular properties of ( Y 1-x-y Zr x Ca y) Ba 2 Cu 3 O 7-δ ceramics were studies by using temperature-dependent ac susceptibility measurements at zero dc magnetic field. The intergranular critical current density was determined from ac susceptibility data by varying the field amplitude H ac . From the imaginary part of the complex susceptibility, χ″(T), we have determined the temperature dependence of the critical current density by using the Bean's model. The ac field dependencies of the intergrain χ″-peak temperatures T p are linear and agree with Müller critical state model. The results were analyzed in terms of superconductor-insulator-superconductor (SIS)-and superconductor-normal-superconductor (SNS)-type models for granular superconductors.

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