CRITICAL FIELD AND MAGNETORESISTANCE OF SINGLE CRYSTAL TmNi2B2C

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3715-3717 ◽  
Author(s):  
D. G. NAUGLE ◽  
K. D. D. RATHNAYAKA ◽  
K. CLARK ◽  
P. C. CANFIELD
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Single Crystal ◽  
Critical Field ◽  
Superconducting Transition Temperature ◽  
Magnetic Transition ◽  
Upper Critical Field ◽  
Superconducting Transition ◽  
Large Anisotropy ◽  
The Magnetic Field

In-plane resistance as a function of magnitude and direction of the magnetic field and the temperature has been measured for TmNi2B2C from above the superconducting transition temperature at 10.7 K to below the magnetic transition TN=1.5 K. The superconducting upper critical field HC2(T) exhibits a large anisotropy and structure in the vicinity of TN. The magnetoresistance above TC is large and changes sign as the direction of the magnetic field is rotated from in-plane to parallel with the c-axis.

Transport Properties and Upper Critical Field of Single Crystal Non-Magnetic LuxY1-xNi2B2C and Magnetic LuxGd1-xNi2B2C

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3493-3495 ◽  
Author(s):  
K. D. D. Rathnayaka ◽  
D. G. Naugle ◽  
A. C. Dumar ◽  
M. P. Anatska ◽  
P. C. Canfield
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Low Temperature ◽  
Single Crystal ◽  
Critical Field ◽  
Magnetic Impurity ◽  
Positive Curvature ◽  
Upper Critical Field ◽  
Magnetic Impurities ◽  
The Magnetic Field

The in-plane resistance of single crystal non-magnetic Lu x Y 1-x Ni 2 B 2 C and magnetic Lu x Gd 1-x Ni 2 B 2 C samples as a function of the magnitude and direction of the magnetic field and temperature have been measured. The superconducting upper critical field Hc2(T) is anisotropic for both. A positive curvature in Hc2(T) near Tc(x) is clearly observed only for the non-magnetic impurity. At low temperature Hc2(T) for the sample with magnetic impurities is strongly reduced. Thermopower, thermal conductivity and resistivity as a function of temperature are also reported for Lu x Gd 1-x Ni 2 B 2 C .

scholarly journals Single Crystal Growth and Superconducting Properties of Antimony Substituted NdO0.7F0.3BiS2

2017 ◽  
Author(s):  
Satoshi Demura ◽  
Satoshi Otsuki ◽  
Yuita Fujisawa ◽  
Hideaki Sakata
Keyword(s):  
Crystal Growth ◽  
Transition Temperature ◽  
Single Crystal ◽  
Superconducting Transition Temperature ◽  
Single Crystal Growth ◽  
Layered Superconductor ◽  
Superconducting Transition ◽  
Large Decrease ◽  
Superconducting Properties ◽  
Chemical Pressure

Antimony (Sb) Substitution less than 10 % is examined on a single crystal of a layered superconductor NdO0.7F0.3BiS2. Superconducting transition temperature of the substituted samples decreases with increasing Sb concentration. A lattice constant along the c axis showed a large decrease compared with that along the a axis. Since in-plane chemical pressure monotonically decreases with increasing Sb concentration, the suppression of the superconductivity is well described in terms of the decrease in in-plane chemical pressure.

The crossover from metal to semi-conductor in Cu-doped LiFeAs system

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542023 ◽  
Author(s):  
L. Y. Xing ◽  
X. C. Wang ◽  
Z. Deng ◽  
S. J. Zhang ◽  
S. M. Feng ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Single Crystal ◽  
Doping Level ◽  
Superconducting Transition Temperature ◽  
Resistivity Measurement ◽  
Superconducting Transition ◽  
Cu Doping ◽  
Semiconducting Behavior

A series of [Formula: see text] single crystal with the doping level [Formula: see text] were grown. The resistivity measurement was conducted. The results show that the 10% Cu doping completely suppresses superconducting transition temperature and when the doping level increases to 16%, it presents a semiconducting behavior in the region of 2 K to 300 K.

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