Ni-impurity effects on the superconducting gap of La2-xSrxCuO4: Measurements of the electronic specific heat under magnetic fields

2010 ◽  
Vol 470 ◽  
pp. S42-S43 ◽  
Author(s):  
T. Kurosawa ◽  
N. Momono ◽  
H. Amitsuka ◽  
M. Oda ◽  
M. Ido
Keyword(s):  
Magnetic Fields ◽  
Specific Heat ◽  
Superconducting Gap ◽  
Electronic Specific Heat ◽  
Impurity Effects

Nodal gap behavior of Bi2Sr2−xLnxCuO6+δ (Ln = La, Eu) investigated by specific heat measurements

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542014 ◽  
Author(s):  
M. Shimizu ◽  
Y. Moriya ◽  
S. Baar ◽  
N. Momono ◽  
Y. Amakai ◽  
...  
Keyword(s):  
Low Temperature ◽  
Magnetic Fields ◽  
Fermi Surface ◽  
Specific Heat ◽  
Excitation Spectrum ◽  
Cuprate Superconductors ◽  
Electronic Excitation ◽  
Linear Term ◽  
Electronic Specific Heat ◽  
Low Temperature Specific Heat

We performed low-temperature specific heat measurements on slightly underdoped samples of monolayer cuprate superconductors [Formula: see text] (Ln = La, Eu, Ln-Bi2201) under magnetic fields [Formula: see text]. In La-Bi2201, the coefficient [Formula: see text] of [Formula: see text]-linear term in the electronic specific heat [Formula: see text] at [Formula: see text] shows [Formula: see text] dependence, as expected in [Formula: see text] -wave superconductors. In Eu-Bi2201, [Formula: see text] shows almost the same [Formula: see text] dependence as that of La-Bi2201 below [Formula: see text] T, while [Formula: see text] is suppressed above [Formula: see text] T and deviates downward from the [Formula: see text] curve of La-Bi2201. This result suggests the the gap and the electronic excitation spectrum near nodes are modified in Eu-Bi2201 except the region of the Fermi surface in the immediate vicinity of nodes.

Specific heat in magnetic fields and superconducting gap structure in FeSe1−Te (0.6 ⩽x⩽ 1)

2014 ◽  
Vol 504 ◽  
pp. 16-18 ◽  
Author(s):  
Takuya Konno ◽  
Tadashi Adachi ◽  
Masato Imaizumi ◽  
Takashi Noji ◽  
Takayuki Kawamata ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Specific Heat ◽  
Superconducting Gap ◽  
Gap Structure

Superconductivity of tin isotopes

1951 ◽  
Vol 47 (4) ◽  
pp. 811-819 ◽  
Author(s):  
J. M. Lock ◽  
A. B. Pippard ◽  
D. Shoenberg
Keyword(s):  
Transition Temperature ◽  
Magnetic Fields ◽  
Specific Heat ◽  
Critical Field ◽  
Electronic Specific Heat ◽  
Transition Temperatures ◽  
Superconducting Transition ◽  
Critical Magnetic Fields ◽  
The Law

AbstractDetailed measurements have been made of the superconducting transition temperatures and critical magnetic fields of the tin isotopes of mass 116, 120 and 124. The transition temperature varies with isotopic mass according to the law Tc ∞ M−n, with n = 0·462 ± 0·014, a result very similar to that already found in mercury. The critical field curves of isotopes 116 and 124 are geometrically similar, in the sense that both many be represented by the same equation, Hc/Ho = f(T/Tc), with the same ratio Ho/Tc for both. It is deduced that the electronic specific heat in normal tin varies only slowly, if at all, with isotopic mass. The variation of Tc and Ho with M is very close to that predicted by Fröhlich and Bardeen.

Physical Properties of Li2Pd3B and Li2Pt3B Superconductors

2007 ◽  
Vol 561-565 ◽  
pp. 2079-2082 ◽  
Author(s):  
Hiroyuki Takeya ◽  
Shigeru Kasahara ◽  
Mohammed El Massalami ◽  
Takashi Mochiku ◽  
Kazuto Hirata ◽  
...  
Keyword(s):  
Specific Heat ◽  
Relaxation Method ◽  
Zero Magnetic Field ◽  
Bcs Theory ◽  
Superconducting Gap ◽  
Electronic Specific Heat ◽  
Superconducting Transition ◽  
Critical Fields ◽  
Resistivity Measurements ◽  
Upper Critical Fields

Superconductivity in two Li-containing compounds of Li2Pd3B and Li2Pt3B was recently discovered. These materials, showing the superconducting transition at 7.2 K and 2.6 K, respectively, have the same cubic structure (P4332) composed of distorted octahedrons without mirror or inversion symmetry along any directions. This is a very interesting feature of those materials in relation to the symmetry of superconductivity. Resistivity measurements in magnetic fields gave their upper critical fields, Hc2(0) = 45 kOe and 19 kOe, respectively. Their specific heat was measured using a heat-pulse relaxation method. The Sommerfeld coefficient (γ) and Debye temperature (θD) terms of Li2Pd3B were given as γ=9.5 mJmol-1K-2 and θD=228 K . The value of C/γT at Tc was calculated to be 1.7. In the same manner, those parameters were described for Li2Pt3B as γ=9.6 mJmol-1K-2, θD=240 K, and C/γTc =0.75, respectively. Since C/γTC in the weakcoupling limit by the BCS theory is 1.43, the value of 1.7 for Li2Pd3B is slightly higher. The electronic specific heat of Li2Pd3B at a zero magnetic field follows the typical exponetial behavior discribed in the BCS theory, while that of Li2Pt3B shows quadratic behavior. This result suggests the line nodes exist in the superconducting gap of Li2Pt3B driven by the spin-orbit interaction.

Investigation of impurity effects in La2−xSrxCu1−yMyO4 (M=Ga,Zn) by electronic specific heat

1996 ◽  
Vol 46 (S3) ◽  
pp. 1233-1234 ◽  
Author(s):  
N. Momono ◽  
T. Nakano ◽  
A. Eida ◽  
K. Chida ◽  
Y. Miura ◽  
...  
Keyword(s):  
Specific Heat ◽  
Electronic Specific Heat ◽  
Impurity Effects
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