Specific Heat Measurements on κ-(Bedt-Ttf)2Cu(Ncs)2

1989 ◽  
Vol 173 ◽  
Author(s):  
R. G. Goodrich ◽  
Jing-Chun Xu
Keyword(s):  
Magnetic Field ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Applied Magnetic Field ◽  
Degrees Of Freedom ◽  
Collective Modes ◽  
Superconducting Transition ◽  
Integral Expression ◽  
Lattice Specific Heat ◽  
Strong Coupling Superconductor

ABSTRACTWe have measured the specific heat of κ-(BEDT-TTF)2Cu(NCS)2 from 4 to 14 K. The superconducting transition at 9.4 K is observed in zero applied magnetic field and in a field of 0.3 T. Both the magnitude of the change in Cp at Tc and the temperature dependence of Cp below Tc indicate a strong coupling superconductor. If the lattice specific heat is assumed to contain contributions due to the eighteen vibrational degrees of freedom, the phonon contribution to the specific heat in our temperature range can be represented by a Debye integral expression with a Debye temperature of 95 K. A model of collective modes suggesting the origin of the eighteen degrees of freedom is presented.

Specific heat of ordered equiatomic InMg, CuPt, and CuAu I below 30 K

1980 ◽  
Vol 58 (2) ◽  
pp. 164-167 ◽  
Author(s):  
Douglas L. Martin
Keyword(s):  
Specific Heat ◽  
Debye Temperature ◽  
Normal State ◽  
Pure Gold ◽  
Two Dimensional ◽  
Superconducting Transition ◽  
Dimensional Effect ◽  
Lattice Specific Heat ◽  
Increasing Temperature

The results of specific heat measurements on ordered In −51.67 at.% Mg are presented. A superconducting transition was seen at about 0.95 K. In the normal state, the lattice specific heat varies in the usual way with temperature, i.e., the Debye temperature initially decreases with increasing temperature. This behavior was also seen in ordered equiatomic CuPt but in ordered equiatomic CuAu I the Debye temperature first goes through a maximum before decreasing to the usual minimum. The structure of all three alloys consists of alternating layers of different mass and it was initially supposed that the CuAu I result was a two-dimensional effect. However, the more recent and normal results on InMg and CuPt make this improbable and it appears that the CuAu I result is related to the behavior of pure gold which is itself anomalous.

MICROWAVE ABSORPTION STUDIES ON HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS VII — ESR OF DPPH COATED ON A THIN BiSrCaCuO FILM FABRICATED ON MgO(100) SUBSTRATE

1992 ◽  
Vol 06 (11) ◽  
pp. 675-682
Author(s):  
K. SUGAWARA ◽  
T. SUGIMOTO ◽  
Y. SHIOHARA ◽  
S. TANAKA
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Temperature Dependence ◽  
Microwave Absorption ◽  
Current Density ◽  
Applied Magnetic Field ◽  
High Tc Superconductors ◽  
High Tc ◽  
Absorption Studies ◽  
Mpmg Method

ESR of DPPH coated on a Bi-Sr-Ca-Cu-O (BSCCO) film (350 Å thick) fabricated on MgO(100) substrate by MOCVD was studied. Temperature dependence of the ESR peak-to-peak linewidth, ΔH pp , and the effect of applied magnetic field on ΔH pp have been studied below about 100 K. The results were compared with those of ESR of DPPH coated on ceramic Y-Ba-Cu-O samples (powder and bulk) made by the MPMG method. The DPPH ESR for the BSCCO film revealed that ΔH pp was independent of applied magnetic field up to about 9 kG. In addition, no similarity between the temperature dependence of the excess ESR linewidth of the DPPH and that of critical current density was found for the BSCCO film. These results for the BSCCO film are different from those for the MPMG YBCO samples.

Properties of H0 VO 4 below 1 K II. The radio-frequency susceptibility

1980 ◽  
Vol 372 (1748) ◽  
pp. 9-17 ◽  
Keyword(s):  
Magnetic Field ◽  
Radio Frequency ◽  
Specific Heat ◽  
Applied Magnetic Field ◽  
Optical Measurements ◽  
Nuclear System ◽  
Magnetic Specific Heat ◽  
Van Vleck ◽  
Good Agreement

Radio-frequency methods are used to determine the variation with applied magnetic field (up to 7T) of the adiabatic susceptibility of the Van Vleck electronic paramagnet HoV0 4 , and the magnetic specific heat of the enhanced nuclear system 165HoV0 4 . The results are in good agreement with values deduced from optical measurements (Battison et al . 1977) and n.m.r. measurements (Bleaney et al . 1978).

scholarly journals Specific heat in KFe2As2in zero and applied magnetic field

2011 ◽  
Vol 83 (17) ◽  
Author(s):  
J. S. Kim ◽  
E. G. Kim ◽  
G. R. Stewart ◽  
X. H. Chen ◽  
X. F. Wang
Keyword(s):  
Magnetic Field ◽  
Specific Heat ◽  
Applied Magnetic Field

A COMPARISON OF RESISTANCE BROADENING IN MAGNETIC FIELD OF SINGLE CRYSTAL YBa2Cu3O7−δ AND THE ORGANIC SUPERCONDUCTOR κ-(BEDT-TTF)2Cu[N(CN)2]Br

1991 ◽  
Vol 05 (08) ◽  
pp. 547-554 ◽  
Author(s):  
W.K. KWOK
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Applied Magnetic Field ◽  
Organic Superconductor ◽  
High Magnetic Fields ◽  
Resistive Transition ◽  
Resistivity Measurements ◽  
Zero Resistance

AC resistivity measurements in fields up to 8 Tesla in fully oxygenated and oxygen deficient single crystals of YBa 2 Cu 3 O 7−δ are presented. Fully oxygenated crystals show the characteristic ‘fantail’ broadening in magnetic field where the onset temperature remains virtually independent of the applied magnetic field and the zero resistance temperature decreases dramatically. However, in oxygen deficient crystals, the temperature dependence of the resistivity undergoes a change in shape at high magnetic fields. These results are compared with the recently discovered highest Tc=11.6 K organic superconductor κ- (ET) 2 Cu[N(CN) 2] Br where the shape of the resistive transition for H||b undergoes a change from a ‘fantail’ resistive broadening in magnetic field to that of a more conventional low Tc superconductor.

The magnetostriction coefficients of nickel

1971 ◽  
Vol 326 (1564) ◽  
pp. 87-96 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Temperature Dependence ◽  
Applied Magnetic Field ◽  
Strain Gauge ◽  
Room Temperature ◽  
Significant Contribution ◽  
Cubic Crystal ◽  
Anisotropy Coefficients

Measurements of the magnetostriction have been made, by means of the strain gauge technique, at room temperature, and at 79 and 5 K , and the results have been analysed in terms of the usual five-coefficient expression for a cubic crystal. The lack of parallelism between the applied magnetic field and the magnetization, due to the magnetic anisotropy, was allowed for by a method which enabled values of the anisotropy coefficients K 1 K 2 and K 3 to be deduced. The magnetostriction coefficients h 3 and h 5 are zero within the experimental uncertainties at all three temperatures and h 3 is certainly too small to produce any significant contribution to K 1 . The temperature dependence of h 1 and h 2 cannot be described by the theory of Callen & Callen (1963).

Scaling temperature dependencies of specific heat of Sm0.55Sr0.45MnO3 manganite near critical point in applied magnetic field up to 5T

2010 ◽  
Vol 405 (21) ◽  
pp. 4574-4577 ◽  
Author(s):  
Shapiullah Belalovich Abdulvagidov ◽  
Victor Ignat’eich Nizhankovskii ◽  
Liana Kurbanovna Magomedova
Keyword(s):  
Magnetic Field ◽  
Specific Heat ◽  
Critical Point ◽  
Applied Magnetic Field
Sign in / Sign up

Export Citation Format

Share Document