SUPERCONDUCTIVITY AND THERMOELECTRIC POWER IN Tl2Ca2Ba2Cu3O10 AND TlCa3BaCu3O9

We report the synthesis and superconducting temperature of the high-T c compounds Tl 2 Ca 2 Ba 2 Cu 3 O 10 and TlCa 3 BaCu 3 O 9. The transition to the superconducting state was measured by the magnetic susceptibility changes and by the temperature dependence of the electrical a.c. and d.c. resistivity and by thermoelectric power measurements. For Tl 2 Ca 2 Ba 2 Cu 3 O 10 a superconducting transition with zero resistance at 114.5K have been observed. Higher T c with zero resistance at 122K have been found in TlCa 3 BaCu 3 O 9.

Download Full-text

Phase transition studies of superionic solids from magnetic susceptibility and thermoelectric power measurements

Journal of Materials Science Letters ◽

10.1007/bf00744098 ◽

1991 ◽

Vol 10 (19) ◽

pp. 1113-1115

Author(s):

H. B. Lal ◽

Kanchan Gaur ◽

A. N. Thakur

Keyword(s):

Phase Transition ◽

Magnetic Susceptibility ◽

Thermoelectric Power ◽

Power Measurements ◽

Transition Studies

Download Full-text

Two Sources of Paramagnetic Curie-Type Contribution to the Normal State Magnetic Susceptibility of HTSC YBa2Cu3O6+δ

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.233-234.161 ◽

2015 ◽

Vol 233-234 ◽

pp. 161-164 ◽

Cited By ~ 1

Author(s):

Larisa Mamsurova ◽

Nikolay Trusevich ◽

Konstantin Pigalskiy ◽

Alexey Vishnev ◽

Igor Mamsurov

Keyword(s):

Magnetic Susceptibility ◽

Temperature Dependence ◽

Experimental Evidence ◽

Normal State ◽

Superconducting State ◽

Oxygen Vacancies ◽

Type Contribution ◽

The Way

The experimental evidence for the existence of chain paramagnetic Curie-type contribution to the temperature dependence of the normal (non-superconducting) state magnetic susceptibility χ (T) was obtained for pure high-Tc superconductors (HTSC) YBa2Cu3O6+δ series with different oxygen contents (0.6 < δ ≤ 1). It was shown that this contribution became clearly evident on curves χ (T) only at the temperature T < 150 K. It increases with the amount of oxygen vacancies increase in Cu1–O4 chains, and also depends on the way of the oxygen vacancies ordering.

Download Full-text

CHARGE DENSITY WAVE INSTABILITY IN TlMo6O17

Modern Physics Letters B ◽

10.1142/s0217984900000483 ◽

2000 ◽

Vol 14 (10) ◽

pp. 345-354 ◽

Cited By ~ 3

Author(s):

RUI XIONG ◽

QINGMING XIAO ◽

JING SHI ◽

HAILIN LIU ◽

WUFENG TANG ◽

...

Keyword(s):

Magnetic Susceptibility ◽

Fermi Surface ◽

Charge Density ◽

Temperature Dependence ◽

Thermoelectric Power ◽

Charge Density Wave ◽

Density Wave ◽

Two Dimensional ◽

Wave Instability ◽

Partial Opening

The charge density wave instability in the quasi-two-dimensional conductor thallium purple molybdenum bronze TlMo 6 O 17 was carefully examined by studying the temperature dependence of resistivity, thermoelectric power (TEP) behavior and magnetic susceptibility. A metal-to-metal transition was confirmed near 110 K in TlMo 6 O 17 due to the partial opening of a gap at the Fermi surface and the driving of charge density wave.

Download Full-text

Magnetic susceptibility, electrical resistivity, and thermoelectric power measurements ofbis(tetrathiotetracene)-triiodide

Physical Review B ◽

10.1103/physrevb.18.439 ◽

1978 ◽

Vol 18 (1) ◽

pp. 439-447 ◽

Cited By ~ 29

Author(s):

L. C. Isett

Keyword(s):

Electrical Resistivity ◽

Magnetic Susceptibility ◽

Thermoelectric Power ◽

Power Measurements

Download Full-text

Occurrence of Superconductivity in Ba-Doped NdSr2(Cu,Mo)3Oz

International Journal of Modern Physics B ◽

10.1142/s0217979203021514 ◽

2003 ◽

Vol 17 (18n20) ◽

pp. 3622-3628

Author(s):

H. K. Lee ◽

K. D. Kim

Keyword(s):

Electrical Resistivity ◽

Magnetic Susceptibility ◽

Thermoelectric Power ◽

Carrier Density ◽

Tetragonal Structure ◽

Partial Substitution ◽

X Ray Diffraction ◽

X Ray ◽

Occurrence Of Superconductivity ◽

Power Measurements

Polycrystalline samples of Nd ( Sr 2-y Ba y)( Cu 3-x Mo x) O z (0 ≤ y ≤ 0.5, 0.1 ≤ x ≤ 0.3) with tetragonal structure were synthesized and investigated by powder X-ray diffraction, electrical resistivity, magnetic susceptibility and thermoelectric power measurements. Contrary to the absence of superconductivity of the Ba-free samples, superconductivity can be achieved by partially substituting Ba for Sr in semiconducting NdSr 2( Cu 3-x Mo x) O z (0.15 ≤ x ≤ 0.3). Thermoelectric power measurements reveal that all the samples are in the underdoped state and the partial substitution of Ba for Sr results in an increase of the carrier density on the superconducting layers.

Download Full-text

Thermoelectric Power in Ce Systems with Unstable Valence

Metals ◽

10.3390/met11091475 ◽

2021 ◽

Vol 11 (9) ◽

pp. 1475

Author(s):

Tomasz Toliński

Keyword(s):

Magnetic Susceptibility ◽

Temperature Dependence ◽

Thermoelectric Power ◽

Type Model ◽

Model Parameters ◽

Similar Magnitude ◽

Cu Substitution ◽

Icf Model ◽

Fluctuation Model

In this paper, we report on a few exemplary tests of the applicability of analysis based on the interconfiguration fluctuation model (ICF) for a description of the temperature dependence of the thermoelectric power, S(T). The examples include a series of alloys: CeNi2(Si1−yGey)2, Ce(Ni1−xCux)2Si2, and the fluctuating valence (FV) compound CeNi4Ga. The two series develop from CeNi2Si2 being the FV system, where the f states occupation increases progressively with the Ge or Cu substitution. We find here that the ICF model parameters are of similar magnitude both for the analysis of the temperature dependence of the magnetic susceptibility and thermoelectric power. The ICF-type model appears to be a powerful tool for the analysis of S(T) dependences in Ce-based FV compounds and alloys.

Download Full-text

Observation by HVEM of the martensite transformation and the superconducting transition in Nb3Sn

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100106004 ◽

1988 ◽

Vol 46 ◽

pp. 788-789

Author(s):

M. A. Kirk ◽

M. C. Baker ◽

B. J. Kestel ◽

H. W. Weber

Keyword(s):

Thin Films ◽

Low Temperature ◽

Superconducting State ◽

Martensite Transformation ◽

Sputter Deposition ◽

Diffusion Reaction ◽

Solute Diffusion ◽

Superconducting Transition ◽

Twin Boundaries ◽

Martensite Structure

It is well known that a number of compound superconductors with the A15 structure undergo a martensite transformation when cooled to the superconducting state. Nb3Sn is one of those compounds that transforms, at least partially, from a cubic to tetragonal structure near 43 K. To our knowledge this transformation in Nb3Sn has not been studied by TEM. In fact, the only low temperature TEM study of an A15 material, V3Si, was performed by Goringe and Valdre over 20 years ago. They found the martensite structure in some foil areas at temperatures between 11 and 29 K, accompanied by faults that consisted of coherent twin boundaries on {110} planes. In pursuing our studies of irradiation defects in superconductors, we are the first to observe by TEM a similar martensite structure in Nb3Sn.Samples of Nb3Sn suitable for TEM studies have been produced by both a liquid solute diffusion reaction and by sputter deposition of thin films.

Download Full-text