First-order superconducting transition in the inter-band model

2014 ◽  
Vol 378 (20) ◽  
pp. 1396-1401 ◽  
Author(s):  
M. Gomes da Silva ◽  
F. Dinóla Neto ◽  
I.T. Padilha ◽  
J. Ricardo de Sousa ◽  
M.A. Continentino
Keyword(s):  
Band Model ◽  
Superconducting Transition ◽  
First Order

scholarly journals Sharp magnetization jump at the first-order superconducting transition inSr2RuO4

2014 ◽  
Vol 90 (22) ◽  
Author(s):  
Shunichiro Kittaka ◽  
Akira Kasahara ◽  
Toshiro Sakakibara ◽  
Daisuke Shibata ◽  
Shingo Yonezawa ◽  
...  
Keyword(s):  
Superconducting Transition ◽  
First Order

scholarly journals First-Order Superconducting Transition near a Ferromagnetic Quantum Critical Point

2003 ◽  
Vol 90 (7) ◽  
Author(s):  
Andrey V. Chubukov ◽  
Alexander M. Finkel’stein ◽  
Robert Haslinger ◽  
Dirk K. Morr
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Superconducting Transition ◽  
First Order ◽  
Quantum Critical

scholarly journals Possible weakly first-order superconducting transition induced by magnetic excitations in the YBCO system: A fluctuation conductivity study

2017 ◽  
Vol 381 (14) ◽  
pp. 1255-1260
Author(s):  
Marlon Luiz Hneda ◽  
Luciano da Silva Berchon ◽  
Paulo Pureur ◽  
Valdemar das Neves Vieira ◽  
Sandra Teixeira Jaeckel ◽  
...  
Keyword(s):  
Superconducting Transition ◽  
Magnetic Excitations ◽  
Fluctuation Conductivity ◽  
First Order ◽  
System A

NONEQUILIBRIUM THERMODYNAMICS OF JOSEPHSON DEVICES

1996 ◽  
Vol 10 (19) ◽  
pp. 903-908
Author(s):  
ALEC MAASSEN VAN DEN BRINK ◽  
H. DEKKER
Keyword(s):  
Phase Difference ◽  
Nonequilibrium Thermodynamics ◽  
Superconducting Phase ◽  
Josephson Coupling ◽  
Detailed Calculation ◽  
Superconducting Transition ◽  
Tunneling Junction ◽  
Josephson Devices ◽  
First Order ◽  
A Value

The rapid increase of the Josephson free energy as the temperature of a tunneling junction drops below the superconducting transition temperature T c is shown to make this transition of first order in a system in which the phase difference ϕ across the junction is constrained to have a nonzero value. Taking this effect into account, we introduce an availability potential governing the nonisothermal dynamics of the junction which, in contrast with previous results, has no artifacts like latent heat being released upon entering the — high temperature — normal state or a value in this state which depends on the — superconducting — phase difference. The thermodynamic analysis is preceded by a detailed calculation of the Josephson coupling in a model of two ideal BCS superconductors coupled by a tunneling Hamiltonian.

scholarly journals Two-dimensional ground-state mapping of a Mott-Hubbard system in a flexible field-effect device

2019 ◽  
Vol 5 (5) ◽  
pp. eaav7282 ◽  
Author(s):  
Yoshitaka Kawasugi ◽  
Kazuhiro Seki ◽  
Satoshi Tajima ◽  
Jiang Pu ◽  
Taishi Takenobu ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Ground State ◽  
Field Effect ◽  
Mott Insulator ◽  
Two Dimensional ◽  
Superconducting Transition ◽  
Microscopic Mechanism ◽  
One Dimensional ◽  
First Order ◽  
Insulating Phase

A Mott insulator sometimes induces unconventional superconductivity in its neighbors when doped and/or pressurized. Because the phase diagram should be strongly related to the microscopic mechanism of the superconductivity, it is important to obtain the global phase diagram surrounding the Mott insulating state. However, the parameter available for controlling the ground state of most Mott insulating materials is one-dimensional owing to technical limitations. Here, we present a two-dimensional ground-state mapping for a Mott insulator using an organic field-effect device by simultaneously tuning the bandwidth and bandfilling. The observed phase diagram showed many unexpected features such as an abrupt first-order superconducting transition under electron doping, a recurrent insulating phase in the heavily electron-doped region, and a nearly constant superconducting transition temperature in a wide parameter range. These results are expected to contribute toward elucidating one of the standard solutions for the Mott-Hubbard model.

Te Substitution Effect in Low-Dimensional Superconductor NbSe2-xTex (x = 0, 0.1, 0.2)

2007 ◽  
Vol 546-549 ◽  
pp. 2019-2022 ◽  
Author(s):  
Ejaz Ahmed ◽  
Lin Jun Li ◽  
Cheng He ◽  
Hong Tao Wang ◽  
Jing Qin Shen ◽  
...  
Keyword(s):  
Upper Critical Field ◽  
Sharp Decrease ◽  
Substitution Effect ◽  
Vapor Transport ◽  
Band Model ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Low Dimensional ◽  
Two Band Model ◽  
Transport Method

The Te doped NbSe2-xTex (x=0, 0.10, 0.20) single crystals were prepared by vapor transport method and the variations of structure and superconducting properties with Te content were studied. It is found that the Te substitution increases the degree of disorder and causes sharp decrease of superconducting transition temperature (Tc). The temperature dependence of upper critical field (Hc2) of pure NbSe2 crystal can be fitted by the two-band model, and the effect of Te substitution on Hc2(T) is discussed.

Force and Moment Response of Pneumatic Tires to Lateral Motion Inputs

1966 ◽  
Vol 88 (1) ◽  
pp. 37-44 ◽  
Author(s):  
L. Segel
Keyword(s):  
Order Approximation ◽  
Equations Of Motion ◽  
Slip Angle ◽  
Band Model ◽  
Lateral Motion ◽  
Side Force ◽  
First Order ◽  
Theoretical Predictions ◽  
First Order Approximation ◽  
Pneumatic Tires

Equations of motion applicable to a “running-band” model of the pneumatic tire, as developed by von Schlippe, are transformed to the frequency domain, and side-force and aligning-moment responses are determined for a tire undergoing sinusoidal (a) lateral oscillations of the wheel center plane; (b) steering oscillations with no lateral motion of the wheel center plane; and (c) lateral and yawing motions phased so that the wheel center plane is always aligned with the direction of motion, i.e., the slip angle is zero. The analytical results obtained for the postulated model show that the side force and aligning moment caused by a steering oscillation (namely, the motion described by (b) above) is equal to that produced by pure side-slipping (i.e., (a) above) plus that caused by pure yawing (i.e., (c) above). Numerical evaluation of the derived frequency-response expressions yields an aligning-moment response to steering judged to be extremely significant in view of the unstable behavior often exhibited by wheels with a steering degree of freedom. Comparison of theoretical predictions with experimental data obtained recently by Saito indicates that the “running-band” model is a good first-order approximation of the lateral nonstationary characteristics of pneumatic tires.

MAGNETORESISTANCE AND HALL EFFECT OF TWO-DIMENSIONAL 2H-NbSe2

2005 ◽  
Vol 19 (01n03) ◽  
pp. 275-279 ◽  
Author(s):  
LINJUN LI ◽  
JINGQIN SHEN ◽  
ZHUAN XU ◽  
HONGTAO WANG
Keyword(s):  
Hall Effect ◽  
Density Wave ◽  
Mean Free Path ◽  
Band Model ◽  
Two Dimensional ◽  
Superconducting Transition ◽  
Drastic Increase ◽  
Steep Decrease ◽  
The Mean ◽  
Magneto Resistance

Single crystals of two-dimensional 2 H - NbSe 2, which undergo superconducting transition at Tc=7.1 K and charge-density wave (CDW) transition at TCDW=30 K , were synthesized. The resistance residual ratio (RRR=R(300 K )/R(8 K )) of the samples from different batches varies from 10 to 30, but the superconducting properties hardly change with RRR. The magneto-resistance (MR)is generally small and its temperature and field dependence of MR violate the Kohler's rule that holds for many conventional metals, indicating that the scattering times of charge carriers are no longer isotropic. The steep decrease of Hall coefficient RH below 50 K can be interpreted by the drastic increase of the mean-free-path of electron type charge carrier. The influence of CDW transition on the resistivity and Hall effect is discussed in a two-band model.

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