arXiv subjects

Zaher Salman

Publications and source records attributed to Zaher Salman.

57 records · Page 4Linked to original sources

arXiv2012

New Perspectives for Cuprate Research: CLBLCO Single Crystals

We report the successful growth of a large (Ca$_{x}$La$_{1-x}$)(Ba$_{1.75-x}$La$_{0.25+x}$)Cu$_{3}$O$_{y}$ (CLBLCO) single crystal. In this material, $x$ controls the maximum of Tc ($T_{c}^{\max}$), with minimal structural changes. Therefore, it allows a search for correlations between material properties and $T_{c}^{\max}$. We demonstrate that the crystals are good enough for neutron scattering and cleave well enough for Raman scattering. These results open new possibilities for cuprate research.

cond-mat.supr-con↗

arXiv2002

Theoretical $T_1$ Calculation for Isotropic High Spin Molecules

We calculate the molecular-spin ($S$), temperature ($T$), and field ($H$) dependence of $1/T_1$ for a local magnetic probe coupled to an isotropic high spin molecule, based on spin-phonon interaction. We compare the calculation to recent NMR and $μ$SR experiments in CrCu$_6$ ($S = 9/2$), CrNi$_6$ ($S = 15/2$) and CrMn$_6$ ($S = 27/2$). Although we can account for the high and intermediate temperature regimes, the calculation is fundamentally different from the data at $T \longrightarrow 0$. Since $1/T_1$ must be due to coupling of the molecular spin to an external heat bath, and since phonon contribution is ruled out at low $T$, we conclude that at these temperatures hyperfine interactions must play an important role in the molecular spin dynamic.

cond-mat.str-el↗

arXiv2002

Dynamics at T -> 0 in the half-integer isotropic high spin molecules

We investigate the dynamical spin-spin auto-correlation function of the isotropic high spin molecules CrCu$_{6}$ (S=9/2), CrNi$_{6}$ (S=15/2) and CrMn$_{6}$ (S=27/2), using magnetization, $μ$SR and NMR measurements. We find that the field autocorrelation time $τ$ of the molecule's spin at zero and low fields is nearly temperature independent as $T\to 50$ mK. The high temperatures $τ$ is very different between the molecules. Surprisingly, it is identical ($\sim$ 10 nsec) at low temperature. This suggests that $τ$ is governed by hyperfine interactions.

cond-mat.mes-hall↗