Anisotropic Thermal Transport in Superconductors with Coexisting Spin Density Waves

Thermal conductivity measurements can provide key and experimentally verifiable insight into the electronic transport of unconventional superconductors. In this work, electronic thermal transport of two-dimensional tight-binding metallic systems with coexisting $d$-wave superconducting (SC) and antiferromagnetic spin density wave (SDW) orders with nesting vector $\mathbf{Q} = (\pi/2,\pi/2)$ or $(\pi,0)$ are considered. The coexisting SC and SDW orders are modelled at the mean-field level. Thermal conductivities are numerically calculated within Boltzmann kinetic theory in the weak impurity scattering (Born) limit. These SDW nesting vectors are chosen for their unique property of reconstructing the Fermi surface (FS) parallel to $\mathbf{Q}$ and preserving the metallic FS perpendicular to $\mathbf{Q}$. This leads to anisotropic electronic thermal conductivities parallel and perpendicular to $\mathbf{Q}$, which also depend on the presence or absence of additional gapless excitations exclusive to the coexistence phase. It was found that the $\mathbf{Q} = (\pi/2,\pi/2)$ and $(\pi,0)$ SDW systems exhibit equivalent electron transport relative to $\mathbf{Q}$. These systems also had equivalent electron transport when coexisting with a $d$-wave SC gap when $\Delta_{\mathbf{k}}$ had the same symmetry class under translations of $\mathbf{Q}$.Comment: 10 pages, 6 figures, submitted to Physical Review

Summer School on Spintronics

Stuart Wolf This book originated as a series of lectures that were given as part of a Summer School on Spintronics in the end of August, 1998 at Lake Tahoe, Nevada. It has taken some time to get these lectures in a form suitable for this book and so the process has been an iterative one to provide current information on the topics that are covered. There are some topics that have developed in the intervening years and we have tried to at least alert the readers to them in the Introduction where a rather complete set of references is provided to the current state of the art. The field of magnetism, once thought to be dead or dying, has seen a remarkable rebirth in the last decade and promises to get even more important as we enter the new millennium. This rebirth is due to some very new insight into how the spin degree of freedom of both electrons and nucleons can play a role in a new type of electronics that utilizes the spin in addition to or in place of the charge. For this new field to mature and prosper, it is important that students and postdoctoral fellows have access to the appropriate literature that can give them a sound basis in the funda­ mentals of this new field and I hope that this book is a very good start in this direction

Lafayette in the Age of the American Revolution : Selected Letters and Papers, 1776-1790

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