Hydrostatic Pressure Effect on the Superconducting Transition Temperature and the Transport Properties of NbSe2

1974 ◽  
Vol 37 (1) ◽  
pp. 36-49 ◽  
Author(s):  
Kazuhiko Yamaya
Keyword(s):  
Transition Temperature ◽  
Hydrostatic Pressure ◽  
Transport Properties ◽  
Superconducting Transition Temperature ◽  
Pressure Effect ◽  
Superconducting Transition

scholarly journals Distinct superconducting properties and hydrostatic pressure effects in 2D α- and β-Mo2C crystal sheets

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yunjie Fan ◽  
Chuan Xu ◽  
Xiang Liu ◽  
Chao Ma ◽  
Yuewei Yin ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Hydrostatic Pressure ◽  
Electronic Properties ◽  
Superconducting Transition Temperature ◽  
Important Influence ◽  
Pressure Effects ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Disordered Carbon

Abstract Recently, 2D Mo2C, a new member of the MXene family, has attracted much attention due to the exotic superconducting properties discovered in 2D α-Mo2C. Here, not only 2D α-Mo2C but also 2D β-Mo2C crystal sheets with distinct disordered carbon distributions were successfully grown. 2D β-Mo2C shows a much stronger superconductivity than 2D α-Mo2C, and their superconductivities have different hydrostatic pressure responses. The superconducting transition temperature Tc of 2D α-Mo2C shows a dome-shaped profile under pressure, implying the existence of two competing effects arising from phononic and electronic properties, while for 2D β-Mo2C, Tc decreases monotonically with increasing pressure, possibly due to phonon stiffening. These results indicate that the electronic properties have a more important influence on the superconductivity in 2D α-Mo2C compared to 2D β-Mo2C. The ordered and disordered carbon distributions in 2D α-Mo2C and β-Mo2C, respectively, may be the underlying origin for their different electronic and superconducting properties.

Simulation of Structural Parameters and Superconducting Transition Temperature of MgB2 under Pressure

2005 ◽  
Vol 475-479 ◽  
pp. 3319-3322
Author(s):  
Yang Shao ◽  
X. Zhang ◽  
Fu Ling Tang
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Pressure Effect ◽  
Structural Parameters ◽  
Experimental Results ◽  
Bcs Theory ◽  
Superconducting Transition ◽  
Potential Parameters

We successfully developed the potential parameters for simulation of MgB2. With these potential parameters, we calculate the lattice parameters and volume variations with pressure up to 240GPa. All these results agree well with experimental data under 40GPa and provide reasonable tendencies from 40GPa to 240GPa. By employing the McMillan expression, it is found that the lattice stiffening dominants the behavior of Tc under pressure in the scope of BCS theory. Using our calculated Grüneisen parameter G g , the simulated pressure effect on Tc accords well with experimental results. Our result shows that the Tc of MgB2 can be destroyed by high pressure.

EFFECTS OF PLASMA OXIDATION ON TRANSPORT PROPERTIES OF SPUTTERED Y-Ba-Cu-O FILMS

1989 ◽  
Vol 03 (01) ◽  
pp. 87-92
Author(s):  
T. NOJIMA ◽  
S. AWAJI ◽  
Y. MAENO ◽  
T. FUJITA
Keyword(s):  
Transition Temperature ◽  
Transport Properties ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Plasma Oxidation ◽  
Normal Resistance ◽  
Before And After ◽  
Zero Resistance

Effects of plasma oxidation on superconducting and normal properties were studied for rf-sputtered Y-Ba-Cu-O films. The plasma oxidation was performed in a mixture gas of Ar-50%O 2 both before and after annealing. The oxidation enhances superconducting transition temperature, T c , and improves metal-like behavior of normal resistance as well. Typical films obtained after the oxidation exhibited the transition with an onset at 94 K and with zero resistance below 82 K. The improvement was found to hold for more than 30 days after oxidation.

Pressure Effect on the Superconducting Transition Temperature for (YxBa1-x)CuO2.3Compound System

1987 ◽  
Vol 26 (Part 2, No. 5) ◽  
pp. L867-L868 ◽  
Author(s):  
Hajime Yoshida ◽  
Hiroaki Morita ◽  
Koshichi Noto ◽  
Takejiro Kaneko ◽  
Hiroyasu Fujimori
Keyword(s):  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Pressure Effect ◽  
Superconducting Transition

Variation of the pressure dependence of the superconducting transition temperature with x in La1−xSrx CuO4

1987 ◽  
Vol 2 (4) ◽  
pp. 421-423 ◽  
Author(s):  
J. E. Schirber ◽  
E. L. Venturini ◽  
J. F. Kwak ◽  
D. S. Ginley ◽  
B. Morosin
Keyword(s):  
Transition Temperature ◽  
Hydrostatic Pressure ◽  
Band Structure ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Sharp Change ◽  
Pressure Measurements ◽  
Superconducting Transition ◽  
Pressure Derivative

Hydrostatic pressure measurements of the superconducting transition temperature were made as a function of x in La2−xSrx CuO4. A sharp change in the behavior occurs between x = 0.2 and 0.25 in that the pressure derivative goes from positive to essentially zero. This result is discussed in the context of band structure models.

HIGH PRESSURE STUDY OF La3Ni2B2Nx

1995 ◽  
Vol 09 (11n12) ◽  
pp. 731-736
Author(s):  
Y. CAO ◽  
R. L. MENG ◽  
C. W. CHU
Keyword(s):  
High Pressure ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Pressure Effect ◽  
Nominal Composition ◽  
Superconducting Transition ◽  
Superconducting Compounds ◽  
High Pressure Study

The pressure effect on the superconducting transition temperature (T c ) of the newly discovered compound with a nominal composition La 3 Ni 2 B 2 N x with a T c ~14 K has been determined up to 1.5 GPa. T c was found to decrease linearly at a rate of –0.9 K/GPa, which is much greater than that of similar superconducting compounds, LuNi 2 B 2 C and Lu 2 Ni 2 B 2 C 2, while the compound resistivity remains unchanged. Reasons for the observation remain unknown.

TRANSPORT PROPERTIES OF La2-x1Srx1CuO4+δ/La2-x2Srx2CuO4+δ MULTILAYERS GROWN BY LASER ABLATION

2013 ◽  
Vol 27 (15) ◽  
pp. 1362029
Author(s):  
H. F. WANG ◽  
Y. Z. ZHANG ◽  
L. H. LIU ◽  
D. P. LI ◽  
G. Y. WANG ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Laser Ablation ◽  
Transport Properties ◽  
Low Temperatures ◽  
Superconducting Transition Temperature ◽  
Dominant Factor ◽  
Deposition Condition ◽  
Superconducting Transition ◽  
Charge Redistribution ◽  
Transport Measurements

A series of La 2-x1 Sr x1 CuO 4+δ/ La 2-x2 Sr x2 CuO 4+δ multilayers were epitaxially grown on (001) LaSrAlO 4 and (001) SrTiO 3 substrates by laser ablation, where x1 = 0.0, 0.08 (underdoped) and x2 = 0.24, 0.32, 0.45 (over-doped). Before the depositions of each multilayer, all of the single layers were deposited and characterized, and then the multilayers were deposited by using the same deposition condition except shifting targets for laser ablation. These multilayers are highly c-axis oriented. Several modulation wavelengths of the sublayers were selected for preparing the multilayers. The resistance measurements of these single layered films of La 2-x1 Sr x1 CuO 4+δ, La 2-x2 Sr x2 CuO 4+δ, and multilayers of La 2-x1 Sr x1 CuO 4+δ/ La 2-x2 Sr x2 CuO 4+δ were performed and compared. The transport measurements suggest that the charge redistribution may be a dominant factor for the superconducting transition temperature in low temperatures.

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