Quantum and classical relaxation in the proton glass
Quantum and classical relaxation in the proton glass
复制标题
DOI：
10.1103/physrevlett.97.145501
复制
发表时间：
2006-10-06
影响因子：
8.6
通讯作者：
Courtens, E.
中科院分区：
文献类型：
--
作者：
Feng, Yejun;Ancona-Torres, C.;Courtens, E.
由铁电 RbH2PO4 和反铁电 NH4H2PO4 晶体溶液形成的氢键网络表现出玻璃态行为，质子隧道效应是低温弛豫的主要机制。我们表征了七十倍频的介电响应，并通过中子康普顿散射直接测量局部势能景观来定量拟合长时间弛豫。质子的集体运动重新排列网络中的氢键。通过与超导体中的涡旋隧道类比，我们将极化的对数衰减与量子力学作用联系起来。
The hydrogen-bond network formed from a crystalline solution of ferroelectric RbH2PO4 and antiferroelectric NH4H2PO4 demonstrates glassy behavior, with proton tunneling the dominant mechanism for relaxation at low temperature. We characterize the dielectric response over seven decades of frequency and quantitatively fit the long-time relaxation by directly measuring the local potential energy landscape via neutron Compton scattering. The collective motion of protons rearranges the hydrogen bonds in the network. By analogy with vortex tunneling in superconductors, we relate the logarithmic decay of the polarization to the quantum-mechanical action.