Hydrogenic states of monopoles in diluted quantum spin ice

Non-monotonic zero point entropy in diluted spin ice

Water ice and spin ice are important model systems in which theory can directly account for zero point entropy associated with quenched configurational disorder. Spin ice differs from water ice in the important respect that its fundamental constituents, the spins of the magnetic ions, can be removed through replacement with non-magnetic ions while keeping the lattice structure intact. In order to investigate the interplay of frustrated interactions and quenched disorder, we have performed systematic heat capacity measurements on spin ice materials which have been thus diluted up to 90%. Invest…

A topological spin glass in diluted spin ice

It is a salient experimental fact that a large fraction of candidate spin liquid materials freeze as the temperature is lowered. The question naturally arises whether such freezing is intrinsic to the spin liquid ("disorder-free glassiness") or extrinsic, in the sense that a topological phase simply coexists with standard freezing of impurities. Here, we demonstrate a surprising third alternative, namely that freezing and topological liquidity are inseparably linked. The topological phase reacts to the introduction of disorder by generating degrees of freedom of a new type (along with interact…

Interplay of dilution and magnetic field in the nearest-neighbor spin-ice model on the pyrochlore lattice

We study the magnetic field effects on the diluted spin-ice materials using the replica-exchange Monte Carlo simulation. We observe five plateaus in the magnetization curve of the diluted nearest-neighbor spin-ice model on the pyrochlore lattice when a magnetic field is applied in the [111] direction. This is in contrast to the case of the pure model with two plateaus. The origin of five plateaus is investigated from the spin configuration of two corner-sharing tetrahedra in the case of the diluted model.

随机横场对自旋系统磁噪声的影响

Random Transverse Field Effects on Magnetic Noise in Spin Systems

研究了随机横场对关联磁系统动力学的影响，提出结合Monte Carlo和精确对角化的Lindbladian框架，揭示了稀疏横场引入的额外时间尺度，为无序非Kramers氧化物的磁化动力学提供了理论解释。