scholarly journals Temperature dependence of the local tunneling conductance in cuprate superconductors with competing antiferromagnetic order

2005 ◽  
Vol 71 (13) ◽  
Author(s):  
Hong-Yi Chen ◽  
C. S. Ting
Keyword(s):  
Temperature Dependence ◽  
Cuprate Superconductors ◽  
Antiferromagnetic Order ◽  
Tunneling Conductance

Many Band Effects in Cuprate Superconductors

1997 ◽  
Vol 11 (13) ◽  
pp. 585-592
Author(s):  
S. P. Kruchinin ◽  
A. M. Yaremko ◽  
E. V. Mozdor
Keyword(s):  
Experimental Data ◽  
Fermi Level ◽  
Temperature Dependence ◽  
Theoretical Approach ◽  
Cuprate Superconductors ◽  
Electron Pair ◽  
Recent Experimental Data ◽  
Natural Manner ◽  
System A ◽  
Interacting Electrons

The new theoretical approach is proposed for study the states responsible for superconductivity of crystals. Within the frameworks of worked out approach it is shown that in electron–phonon system a class of new so-called coupled states arises. Postulated in BCS method electron-pair states k1 + k2 = 0, s + s′ = 0 are in natural manner included in this class. The model numerical calculations have shown that SC gap depends on number of bands crossing the Fermi level on the momenta k1+k2 = K≠ 0 of interacting electrons and that the temperature dependence of SC gap for HTSC is more complicated (in agreement with the recent experimental data) then predicted in BCS approach.

SEEBECK EFFECT IN THIN FILMS AND SUPERLATTICES OF CUPRATE SUPERCONDUCTORS

2003 ◽  
Vol 17 (04n06) ◽  
pp. 415-421 ◽  
Author(s):  
M. PUTTI ◽  
D. MARRÈ ◽  
M. TASSISTO ◽  
G. BALESTRINO ◽  
P. G. MEDAGLIA ◽  
...  
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Cuprate Superconductors ◽  
Seebeck Effect

In this paper we present thermopower measurements on Nd1 + xBa2 - xCu3O7 - δ thin films and (BaCuO2)2/(CaCuO2)n superconducting superlattices. We estimate for these systems how much charge is transferred to the CuO2 planes. For the superlattices we have clear evidence that the charge transferred by the Charge Reservoir block distributes uniformly on the available CuO2 planes. The temperature dependence of the thermopower is then compared with the prediction of a model which considers the electron-phonon-impurity interference.

CRYSTAL GROWTH OF MULTI-LAYERED Ba2Ca4Cu5O10(O,F)2 (F-0245) SUPERCONDUCTOR UNDER HIGH PRESSURE

2005 ◽  
Vol 19 (01n03) ◽  
pp. 263-266 ◽  
Author(s):  
K. TOKIWA ◽  
H. OKUMOTO ◽  
S. KONO ◽  
S. IGA ◽  
K. TAKEMURA ◽  
...  
Keyword(s):  
High Pressure ◽  
Electrical Resistivity ◽  
Crystal Growth ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Cuprate Superconductors ◽  
Resistivity Measurements ◽  
Starting Mixture

Single crystals of multi-layered Ba 2 Ca 4 Cu 5 O 10( O , F )2 superconductor(F-0245) have been grown under a high pressure of 4.5 GPa . Single crystals with in-plane length of 500μm were typically obtained and flat shiny areas with more than 1 mm 2 were also observed on the surface of fractured samples. Tc values for these samples were determined by electrical resistivity measurements. These values were found to change from 70 K to 85 K by change of oxygen and fluorine contents in the starting mixture. The temperature dependence of resistivity showed characteristic of under-doped cuprate superconductors.

Temperature dependence of tunneling conductance in diffusive normal metal/triplet superconductor junctions

2007 ◽  
Vol 460-462 ◽  
pp. 1319-1320
Author(s):  
Iduru Shigeta ◽  
Takehito Yokoyama ◽  
Yasuhiro Asano ◽  
Fusao Ichikawa ◽  
Yukio Tanaka
Keyword(s):  
Temperature Dependence ◽  
Normal Metal ◽  
Tunneling Conductance

Temperature Dependence of Commensurate Magnetic Resonance in Cuprate Superconductors

2018 ◽  
Vol 787 ◽  
pp. 31-36
Author(s):  
Yu Lan ◽  
Lü Lin Kuang
Keyword(s):  
Magnetic Resonance ◽  
Temperature Dependence ◽  
Cuprate Superconductors ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
Superconducting Gap ◽  
Superconducting Transition ◽  
Increasing Temperature ◽  
Gap Parameter

Within the kinetic energy driven superconducting mechanism, we have studied the temperature dependence of commensurate magnetic resonance in cuprate superconductors. It is shown that the commensurate magnetic resonance peak at the antiferromagnetic wave vector point persists in the superconducting state until the temperature rises to the superconducting transition temperature $T_{\rm c}$. The intensity of the resonance peak decreases with increasing temperature which is just like the temperature dependence of the superconducting gap parameter. Our results are in qualitative agreement with the inelastic neutron scattering experimental data and reflect that the commensurate magnetic resonance is closely related to the creation of the charge carrier pairs and thus the superconducting mechanism of cuprate superconductors.

scholarly journals Universal spin-glass behaviour in bulk LaNiO2, PrNiO2 and NdNiO2

2021 ◽  
Author(s):  
HAI LIN ◽  
Dariusz Jakub Gawryluk ◽  
Yannick Maximilian Klein ◽  
Shangxiong Huangfu ◽  
Ekaterina Pomjakushina ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Spin Glass ◽  
Cuprate Superconductors ◽  
Parent Compound ◽  
Earth Metal ◽  
Electronic Configuration ◽  
Antiferromagnetic Order ◽  
Ac Magnetic Susceptibility ◽  
Infinite Layer ◽  
Spin Glass Behaviour

Abstract Motivated by the recent discovery of superconductivity in infinite-layer nickelate thin films, we report on a synthesis and magnetization study on bulk samples of the parent compounds RNiO2 (R=La, Pr, Nd). The frequency-dependent peaks of the AC magnetic susceptibility, along with remarkable memory effects, characterize spin-glass states. Furthermore, various phenomenological parameters via different spin glass models show strong similarity within these three compounds as well as with other rare-earth metal nickelates. The universal spin-glass behaviour distinguishes the nickelates from the parent compound CaCuO2 of cuprate superconductors, which has the same crystal structure and d9 electronic configuration but undergoes a long-range antiferromagnetic order. Our investigations may indicate a distinctly different nature of magnetism and superconductivity in the bulk nickelates than in the cuprates.

Tunneling Conductance of a Bi2Sr2CaCu2O8-GaAs Junction: Temperature Dependence of the Gap

1990 ◽  
Vol 59 (7) ◽  
pp. 2473-2482 ◽  
Author(s):  
Nobuaki Miyakawa ◽  
Daisuke Shimada ◽  
Tadaharu Kido ◽  
Nobuo Tsuda
Keyword(s):  
Temperature Dependence ◽  
Junction Temperature ◽  
Tunneling Conductance

scholarly journals EFFECT OF GAUGE BOSON MASS ON THE PHASE STRUCTURE OF QED3

2010 ◽  
Vol 25 (31) ◽  
pp. 2645-2653 ◽  
Author(s):  
JIAN-FENG LI ◽  
YU-QING ZHOU ◽  
HONG-TAO FENG ◽  
WEI-MIN SUN ◽  
HONG-SHI ZONG
Keyword(s):  
Phase Diagram ◽  
Chiral Symmetry ◽  
Gauge Boson ◽  
Finite Temperature ◽  
Cuprate Superconductors ◽  
Chiral Symmetry Breaking ◽  
Boson Mass ◽  
Antiferromagnetic Order ◽  
Chiral Phase ◽  
Gauge Boson Mass

Dynamical chiral symmetry breaking (DCSB) in QED3 with finite gauge boson mass is studied in the framework of the rainbow approximation of Dyson–Schwinger equations. By adopting a simple gauge boson propagator ansatz at finite temperature, we first numerically solve the Dyson–Schwinger equation for the fermion self-energy to determine the chiral phase diagram of QED3 with finite gauge boson mass at finite chemical potential and finite temperature, then we study the effect of the finite gauge mass on the phase diagram of QED3. It is found that the gauge boson mass ma suppresses the occurrence of DCSB. The area of the region in the chiral phase diagram corresponding to DCSB phase decreases as the gauge boson mass ma increases. In particular, chiral symmetry gets restored when ma is above a certain critical value. In this paper, we use DCSB to describe the antiferromagnetic order and use the gauge boson mass to describe the superconducting order. Our results give qualitatively a physical picture on the competition and coexistence between antiferromagnetic order and superconducting orders in high temperature cuprate superconductors.

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