H. R. Ott

Strong electron-phonon coupling in superconductingMgB2: A specific heat study

We report on measurements of the specific heat of the recently discovered superconductor MgB

Spectroscopic Evidence for Unconventional Superconductivity in UBe{sub 13}

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Trends in Superconductivity of Heavy-Electron Metals

in the temperature range between 3 and 220 K. Based on a modified Debye-Einstein model, we have achieved a rather accurate account of the lattice contribution to the specific heat, which allows us to separate the electronic contribution from the total measured specific heat. From our result for the electronic specific heat, we estimate the electron-phonon coupling constant

Electronic transport and thermal properties of CaB6 and Eu1−xCaxB6

\lambda

On the phase transition of superconducting cuprates in zero and non-zero magnetic fields

to be of the order of 2, significantly enhanced compared to common weak-coupling values

Recent Developments (After 2000)

\leq 0.4

History and introduction

. Our data also indicate that the electronic specific heat in the superconducting state of MgB

Magneto-optical behavior of EuIn2P2

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Low-temperature specific heat of the heavy electron superconductor U1-xThxBe13(x=0, 0.033) in external magnetic fields

can be accounted for by a conventional, s-wave type BCS-model.

LOW-TEMPERATURE THERMAL CONDUCTIVITY OF ICOSAHEDRAL AL70MN9PD21

We report on measurements of the differential conductivity G of UBe13-Au contacts, which reveal the existence of low-energy Andreev surface bound states. These bound states are identified via huge conductance peaks at zero bias that may form only in superconductors with nontrivial energy-gap functions. From the voltage dependence of G at T<T(c) we also establish a lower limit of the normalized energy gap, such that 2Delta(0) / k(B)T(c)>6.7, much in excess of the weak coupling BCS value of 3.5, and directly indicating strong coupling effects in superconducting UBe13.