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For unconventional heavy Fermion superconductors, typified by UBe_13, thesuperconducting transition temperatures Tc are shown to correlate with acharacteristic energy hbar^2 /(m* xi^2), m* being the effective mass and xi thecoherence length. For four of the six materials for which Tc, m* and xi areavailable, kB Tc ~ 20 hbar^2 / (m* xi^2). One heavy Fermion material,UPd_2Al_3, reveals a tendency for the above linear behaviour to saturate atsubstantially larger hbar^2 / (m* xi^2) than for UBe_13. The sixth materialconsidered, URu_2Si_2, falls between UBe_13 and UPd_2Al_3. To embrace d-wavepairing in cuprates, a log-log plot reveals that kB Tc ~ hbar^2 / (m* xi^2),but more materials for which m* and xi are measured will be required tosubstantiate the correlation in these high-Tc substances

physical review. b, condensed matter

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>for non-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-wave pairing superconductors correlated with coherence length and effective mass

Tcfor non-s-wave pairing superconductors correlated with coherence length and effective mass