  Let $(M,g)$ be a compact, boundaryless manifold of dimension $n$ with the
property that either (i) $n=2$ and $(M,g)$ has no conjugate points, or (ii) the
sectional curvatures of $(M,g)$ are nonpositive. Let $\Delta$ be the positive
Laplacian on $M$ determined by $g$. We study the $L^{2}\to{}L^{p}$ mapping
properties of a spectral cluster of $\sqrt{\Delta}$ of width $1/\log\lambda$.
Under the geometric assumptions above, \cite{berard77} B\'{e}rard obtained a
logarithmic improvement for the remainder term of the eigenvalue counting
function which directly leads to a $(\log\lambda)^{1/2}$ improvement for
H\"ormander's estimate on the $L^{\infty}$ norms of eigenfunctions. In this
paper we extend this improvement to the $L^p$ estimates for all
$p>\frac{2(n+1)}{n-1}$.
