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.

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 Gaussian and critical scalings in the magnetoconductivity fluctuations of Y3Ba5Cu8O18 superconductor

2018 ◽  
Vol 32 (32) ◽  
pp. 1850360
Author(s):  
F. T. Dias ◽  
V. N. Vieira ◽  
C. P. Oliveira ◽  
D. L. Silva ◽  
F. Mesquita ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Power Law ◽  
Applied Magnetic Field ◽  
Granular Structure ◽  
Superconducting Transition ◽  
Critical Scaling ◽  
First Order ◽  
Zero Resistance

We have studied the superconducting transition and the magnetoconductivity fluctuations in the polycrystalline Y3Ba5Cu8O[Formula: see text] (Y358) superconductor under magnetic fields upto 1 T. A two-step superconducting transition could be observed as a consequence of the granular structure of the sample, which is strongly affected by the applied magnetic field. Gaussian and genuine critical 3D-XY-E fluctuation regimes were identified. A critical scaling regime beyond 3D-XY was identified for magnetic fields upto 0.25 T, corresponding to the averaged exponent 0.19 and suggesting the occurrence of the weak first-order character of the superconducting transition. In the approximation to the zero resistance a power law regime could be observed, corresponding to the averaged exponent 2.37, which are smaller than previously reported for the Y358 system. Our results are discussed in terms of the Y358 and YBa2Cu3O[Formula: see text](Y123) results in the literature.

Local magnetization study of the first-order superconducting transition in CeCoIn5

2008 ◽  
Vol 69 (12) ◽  
pp. 3208-3210
Author(s):  
R. Okazaki ◽  
H. Shishido ◽  
T. Shibauchi ◽  
M. Konczykowski ◽  
R. Settai ◽  
...  
Keyword(s):  
Superconducting Transition ◽  
Local Magnetization ◽  
Magnetization Study ◽  
First Order

First-order superconducting transition of Sr2RuO4 investigated by magnetization and magnetic torque

2016 ◽  
Vol 400 ◽  
pp. 81-83 ◽  
Author(s):  
Shunichiro Kittaka ◽  
Akira Kasahara ◽  
Toshiro Sakakibara ◽  
Daisuke Shibata ◽  
Shingo Yonezawa ◽  
...  
Keyword(s):  
Superconducting Transition ◽  
Magnetic Torque ◽  
First Order

SPECIFIC HEAT IN MONO-CRYSTAL YBCO: λ-LIKE ANOMALIES AT 90K AND 229K

1988 ◽  
Vol 02 (05) ◽  
pp. 1171-1183 ◽  
Author(s):  
K. Fossheim ◽  
O. M. Nes ◽  
T. Lægreid ◽  
C. N. W Darlington ◽  
D. A. O'Connor ◽  
...  
Keyword(s):  
Phase Transition ◽  
Specific Heat ◽  
High Precision ◽  
Order Phase Transition ◽  
Ybco Superconductor ◽  
Superconducting Transition ◽  
First Order ◽  
Temperature Range ◽  
First Order Phase Transition ◽  
First Order Phase

The specific heat, C p , has been measured with high precision in a mono-crystal of YBa 2 Cu 3 O 7−δ (YBCO) superconductor in the temperature range 55K-300K. The measurements provide data with a relative resolution Δ C p / C p of approximately 5 · 10−4. The main conclusions are: 1) Close to the superconducting transition the specific heat shows influence of fluctuations. 2) A reversible second order or weakly first order phase transition is found to occur at T o = 229 K .

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