Paper Titles
Creep Characterization of Power-Law Materials through Pseudo-Steady Indentation Tests
p.2063
Variation of Hardness with Microstructure Evolutions in Metastable β Titanium Alloy TIMETAL®LCB
p.2067
The Relationship between the Bending Direction and Burgers Vector of Threading Dislocations at a Coherent Heterointerface in AlGaN/AlN Layers
p.2071
Electron Holography on Charging Effect in Non-Conductive Materials
p.2075
Physical Properties of Li2Pd3B and Li2Pt3B Superconductors
p.2079
Characterization of Nano-Scale Particles in Hot-Rolled, High Strength Low Alloy Steels (HSLA)
p.2083
"In Situ-Tracking” Observation of Stainless Steel Microstructural Development during Elevated Service Using EBSD and SEM
p.2087
Site-by-Site Electronic Structure Analysis of Al-Containing Complex Compounds Using Channeling EELS and First Principles Calculations
p.2091
X-Ray Reflectivity Studies of Pt/AlN Multilayered Films
p.2095

Physical Properties of Li2Pd3B and Li2Pt3B Superconductors

Article Preview

Abstract:

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.

You might also be interested in these eBooks
PRICM 6 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

2079-2082

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.2079

Citation:

Cite this paper

Online since:

October 2007

Authors:

Hiroyuki Takeya, Shigeru Kasahara, Mohammed El Massalami, Takashi Mochiku, Kazuto Hirata, Kazumasa Togano

Keywords:

Li2Pd3B, Li2Pt3B, Lithium Borides, Resistivity, Specific Heat, Superconductor

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] G. Profeta, A. Continenza, F. Bernardini and S. Massidda: Phys. Rev. B Vol. 65 (2002), p.054502.

Google Scholar

[2] H. Rosner, A. Kitaigorodsky and W. E. Pickett: Phys. Rev. Lett. Vol. 88 (2002), p.127001.

Google Scholar

[3] K. Togano, P. Badica, Y. Nakamori, S. Orimo, H. Takeya and K. Hirata: Phys. Rev. Lett. Vol. 93 (2004), p.247004.

DOI: 10.1103/physrevlett.93.247004

Google Scholar

[4] H. Takeya, K. Yamada, K. Yamaura, T. Mochiku, H. Fujii, T. Furubayashi, K. Hirata, K. Togano: Physica C Vol. 426-431 (2005), p.411.

DOI: 10.1016/j.physc.2005.01.032

Google Scholar

[5] F. Izumi, R. A. Dilanian, in: Commission on Powder Diffraction, IUCr Newslett., No. 32, 2005, p.59.

Google Scholar

[6] E. Bauer, G. Hilscher, H. Michor, C. Paul, E. W. Scheidt, A. Gribanov, Y. Seropegin, H. Noël, M. Sigrist and P. Rogl: Phys. Rev. Lett. Vol. 92 (2004), p.027003.

Google Scholar

[7] H. Takeya, K. Hirata, K. Yamaura, K. Togano, M. El Massalami, R. Rapp, F. A. Chaves and B. Ouladdiaf: Phys. Rev. B Vol. 72 (2005), p.104506.

Google Scholar

[8] H. Q. Yuan, D. F. Agterberg, N. Hayashi, P. Badica, D. Vandervelde, K. Togano, M. Sigrist and M. B. Salamon: Phys. Rev. Lett. Vol. 97 (2006), p.017006.

Google Scholar

[9] M. Nishiyama, Y. Inada and G. -q. Zheng: Phys. Rev. Lett. Vol. 98 (2007), p.047002.

Google Scholar