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Physica C-superconductivity and Its Applications | 2003

Unusual effects of anisotropy on the specific heat of ceramic and single crystal MgB2

F. Bouquet; Yuxing Wang; I. Sheikin; P. Toulemonde; M. Eisterer; H.W. Weber; S. Lee; S. Tajima; A. Junod

Abstract The two-gap structure in the superconducting state of MgB 2 gives rise to unusual thermodynamic properties which depart markedly from the isotropic single-band BCS model, both in their temperature- and field dependence. We report and discuss measurements of the specific heat up to 16 T on ceramic, and up to 14 T on single crystal samples, which demonstrate these effects in the bulk. The behavior in zero field is described in terms of two characteristic temperatures, a crossover temperature T c,π ≅13 K, and a critical temperature T c = T c,σ ≅38 K, whereas the mixed-state specific heat requires three characteristic fields, an isotropic crossover field μ 0 H c2,π ≅0.35 T, and an anisotropic upper critical field with extreme values μ 0 H c2,σ, c ≅3.5 T and μ 0 H c2,σ, ab ≅19 T, where the indexes π and σ refer to the three-dimensional and two-dimensional sheets of the Fermi surface. Irradiation-induced interband scattering tends to move the gaps toward a common value, and increases the upper critical field up to ∼28 T when T c ≅30 K.


Physical Review B | 2004

Specific heat of Nb 3 Sn: The case for a second energy gap

Violeta Guritanu; Wilfried Goldacker; F. Bouquet; Yuxing Wang; Rolf Walter Lortz; G. Goll; A. Junod

We present specific-heat data for


Journal of Physics: Condensed Matter | 2003

Specific heat of MgB2 after irradiation

Yuxing Wang; F. Bouquet; I. Sheikin; P. Toulemonde; B. Revaz; M. Eisterer; H.W. Weber; Joerg Hinderer; A. Junod

{\mathrm{Nb}}_{3}\mathrm{Sn}


arXiv: Superconductivity | 2002

Specific heat of MgB_2 after irradiation

Yuxing Wang; F. Bouquet; I. Sheikin; Pierre Toulemonde; Bernard Revaz; M. Eisterer; H.W. Weber; Joerg Hinderer; A. Junod

, a well-known technically applied superconductor with a critical temperature


Review of Scientific Instruments | 2005

Modulated-bath ac calorimetry using modified commercial Peltier elements

Rolf Walter Lortz; Satoko Abe; Yuxing Wang; F. Bouquet; Ulrich Tutsch; A. Junod

{T}_{c}\ensuremath{\cong}18\phantom{\rule{0.3em}{0ex}}\mathrm{K}


Physical Review B | 2004

Nonlinear excess conductivity of Bi2Sr2Can-1CunO2n+4+x (n=1,2) thin films

L. Fruchter; I. Sfar; F. Bouquet; Z. Z. Li; H. Raffy

, in the temperature range from


Physica C-superconductivity and Its Applications | 2003

Specific heat of ceramic and single crystal MgB2

A. Junod; Yuxing Wang; F. Bouquet; I. Sheikin; P. Toulemonde; M. R. Eskildsen; M. Eisterer; H.W. Weber; S. Lee; S. Tajima

1.2\phantom{\rule{0.5em}{0ex}}\text{to}\phantom{\rule{0.5em}{0ex}}200\phantom{\rule{0.3em}{0ex}}\mathrm{K}


Physical Review B | 2007

Contribution of disorder to the hall effect in Bi2Sr2CuO6+δ

L. Fruchter; H. Raffy; F. Bouquet; Z. Z. Li

in zero magnetic field, and from


Journal of Physics: Condensed Matter | 2002

Specific heat of heavy-fermion CePd2Si2 in high magnetic fields

I. Sheikin; Yuxing Wang; F. Bouquet; P. Lejay; A. Junod

1.5\phantom{\rule{0.5em}{0ex}}\text{to}\phantom{\rule{0.5em}{0ex}}22\phantom{\rule{0.3em}{0ex}}\mathrm{K}


Physica C-superconductivity and Its Applications | 2000

The vortex states of YBa2Cu3O7−δ: phase diagram; calorimetric and magnetic properties

C. Marcenat; F. Bouquet; R. Calemczuk; U. Welp; W. K. Kwok; G. W. Crabtree; Norman E. Phillips; R. A. Fisher; Andreas Schilling

in fields

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