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

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

RESISTIVE ANOMALIES AT NEAR 250 K IN Hg-Ca-Cu-O AND Fe-S SYSTEMS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3755-3757
Author(s):  
S. S. YOM ◽  
JONG-KU PARK ◽  
G. H. KIM ◽  
H. S. KIM ◽  
J. Y. LEE ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Magnetic Susceptibility ◽  
Mechanical Alloying ◽  
Thermoelectric Power ◽  
Thermal Hysteresis ◽  
Unknown Origin ◽  
Synthesis Condition ◽  
Nominal Composition ◽  
Rapid Drop

High pressure synthesized samples of nominal composition of Ca 2-x Hg x CuO y with x=0.10~0.20 under reductive synthesis condition showed stable and reproducible resistivity onset transition at 225~254 K accompanied by rapid drop of thermoelectric power without accompanying magnetic susceptibility transition. Fe 1-x S ( x =0) by mechanical alloying method showed resistivity anomaly and thermal hysteresis at 150~180 K. These resistive anomalies may be phase transition of unknown origin rather than an indication of superconductivity.

Physical properties of electrically conducting and stable molecular neutral radical solid [Co(2,3-Nc)(CN)2]CH3CN (2,3-Nc = 2,3-naphthalocyanine)

2004 ◽  
Vol 08 (11) ◽  
pp. 1258-1268 ◽  
Author(s):  
Toshio Naito ◽  
Naoko Matsumura ◽  
Tamotsu Inabe ◽  
Masaki Matsuda ◽  
Hiroyuki Tajima
Keyword(s):  
Phase Transition ◽  
Magnetic Susceptibility ◽  
Physical Properties ◽  
Thermoelectric Power ◽  
Charge Separation ◽  
Energy Gap ◽  
Reflectance Spectra ◽  
Strongly Correlated ◽  
Neutral Radical ◽  
Type Transition

Solid state properties of dicyano(2,3-naphthalocyaninato)cobalt(III) neutral radical crystal, [ Co (2,3- Nc )( CN )2] CH 3 CN , were characterized by measurements of the resistivity under high pressure and under uniaxial strain, thermoelectric power, magnetic susceptibility, ESR and polarized reflectance spectra. The title compound exhibited thermally activated-type electrical conductivity along the c-axis. The room temperature (RT) resistivity ρRT along the c-axis and activation energy Ea rapidly decreased with increasing pressure. The temperature-dependent thermoelectric power S was that of a typical one-dimensional (1D) semiconductor. However the high absolute value of S suggested that this electronic system should be strongly correlated. Although the electrical resistivity exhibited monotonous temperature-dependence, the magnetic susceptibility clearly indicated a Peierls-type transition and marked fluctuation from RT. Both Peierls-type transitions and fluctuations are characteristic phenomena to 1D conductors. Furthermore ESR spectra manifested that the Peierls-type transition occurred at 100 K. The inconsistency between the electrical behavior (without a phase-transition) and magnetic behavior (with a phase-transition) indicates separation of the degrees of freedom in spin and charge (spin-charge separation) of this material. Spin-charge separation is a theoretically predicted phenomenon peculiar to the 1D conductors with strong correlation. The reflectance spectra were quantitatively explained by a 1D Hubbard model, and manifested the existence of a structural fluctuation of this material from RT. Based on these observed physical properties it is concluded that [ Co (2,3- Nc )( CN )2] CH 3 CN is a strongly correlated 1D semiconductor with a Mott(Hubbard) type energy gap and characterised with a fluctuation and spin-charge separation.

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

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.

SUPERCONDUCTIVITY AND THERMOELECTRIC POWER IN Tl2Ca2Ba2Cu3O10 AND TlCa3BaCu3O9

1988 ◽  
Vol 02 (07) ◽  
pp. 923-928 ◽  
Author(s):  
L. ALCÁCER ◽  
M. ALMEIDA ◽  
U. BRAUN ◽  
A.P. GONÇALVES ◽  
S.M. GREEN ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Temperature Dependence ◽  
Thermoelectric Power ◽  
Superconducting State ◽  
Superconducting Transition ◽  
Zero Resistance ◽  
Power Measurements

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.

Electrical Resistivity, Magnetic Susceptibility and Thermoelectric Power of PtGa2

1990 ◽  
Author(s):  
Li-Shing Hsu ◽  
Lu-Wei Zhou ◽  
F. L. Machado ◽  
W. G. Clark ◽  
R. S. Williams
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Thermoelectric Power

scholarly journals Oxygen vacancy doping of hematite analyzed by electrical conductivity and thermoelectric power measurements

2017 ◽  
Vol 1 (6) ◽  
Author(s):  
Jan Mock ◽  
Benjamin Klingebiel ◽  
Florian Köhler ◽  
Maurice Nuys ◽  
Jan Flohre ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Oxygen Vacancy ◽  
Thermoelectric Power ◽  
Power Measurements ◽  
Vacancy Doping

Phase-transition studies in polymesomorphic compounds. 1. Density studies in N-(p-n-hexyloxybenzylidene)-p-n-butylaniline

1983 ◽  
Vol 87 (5) ◽  
pp. 899-902 ◽  
Author(s):  
N. V. S. Rao ◽  
V. G. K. M. Pisipati
Keyword(s):  
Phase Transition ◽  
Transition Studies

Thermoelectric Power Measurements of xSb-(60-x)V2O5-40TeO2 Glasses

2015 ◽  
Vol 45 (1) ◽  
pp. 307-311 ◽  
Author(s):  
Dariush Souri ◽  
Zahra Siahkali ◽  
Mohammad Moradi
Keyword(s):  
Thermoelectric Power ◽  
Power Measurements
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