Nuclear Spin-Lattice Relaxation Due to Domain Wall Solitons in CsCoCl<sub>3</sub>

Ajiro, Yoshitami; Kikuchi, Hikomitsu; Okita, Takushi; Chiba, M.; Adachi, Ken; Mekata, Mamoru; Goto, Takao

doi:10.1143/jpsj.58.390

Cited by 12 publications

(3 citation statements)

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“…16,17) and CsCoBr 3 (Refs. 18,19), as well as electron spin resonance, 20 nuclear magnetic resonance, 21 and optical 22 experiments.…”

Section: The One-soliton Approximationmentioning

confidence: 99%

“…the Villain mode) has been established experimentally in Ising-like antiferromagnets. [16][17][18][19][20][21][22] This suggests that, at least for certain spin-chains, inelastic scattering and disorder can be neglected to first approximation. In the end, the inelastic mean free time τ in should be compared with the Bloch frequency ω B .…”

Section: Conditions For Observationmentioning

confidence: 99%

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Bloch oscillations of magnetic solitons in anisotropic spin-12chains

Kyriakidis

Loss

1998

Phys. Rev. B

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We study the quantum dynamics of soliton-like domain walls in anisotropic spin-1/2 chains in the presence of magnetic fields. In the absence of fields, domain walls form a Bloch band of delocalized quantum states while a static field applied along the easy axis localizes them into Wannier wave packets and causes them to execute Bloch oscillations, i.e. the domain walls oscillate along the chain with a finite Bloch frequency and amplitude. In the presence of the field, the Bloch band, with a continuum of extended states, breaks up into the Wannier-Zeeman ladder-a discrete set of equally spaced energy levels. We calculate the dynamical structure factor S zz (q, ω) in the one-soliton sector at finite frequency, wave vector, and temperature, and find sharp peaks at frequencies which are integer multiples of the Bloch frequency. We further calculate the uniform magnetic susceptibility and find that it too exhibits peaks at the Bloch frequency. We identify several candidate materials where these Bloch oscillations should be observable, for example, via neutron scattering measurements. For the particular compound CoCl 2 ·2H 2 O we estimate the Bloch amplitude to be on the order of a few lattice constants, and the Bloch frequency on the order of 100 GHz for magnetic fields in the Tesla range and at temperatures of about 18 Kelvin. 75.60.Ch, 75.40.Gb, 75.90.+w, 76.60.Es, 71.70.Ej

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“…16,17) and CsCoBr 3 (Refs. 18,19), as well as electron spin resonance, 20 nuclear magnetic resonance, 21 and optical 22 experiments.…”

Section: The One-soliton Approximationmentioning

confidence: 99%

Section: Conditions For Observationmentioning

confidence: 99%

Bloch oscillations of magnetic solitons in anisotropic spin-12chains

Kyriakidis

Loss

1998

Phys. Rev. B

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“…In this section we will study the scattering of a domain wall by impurities in a S = 4 Isinglike magnetic chain. On the one hand this will illubtrate the concept of a domain wall as a particle by studying its motion; on the other hand, this problem has attracted interest experimentally in order to understand the result of NMR experiments (Goto 1989, Feme eta[ 1983, in particular for the effect of domain wall diff usion on T, (Boucher er af 1985, Ajiro ef al1989). We will consider the king model with transverse interactions ((l.l), (1.2)) for antiferromagnetic coupling and will study two different types of impurities:…”

Section: Domain Wall Scattering By Impuritiesmentioning

confidence: 99%

S=1/2 magnetic chains as domain wall systems

Mikeska¹,

Miyashita²,

Ristow³

1991

J. Phys.: Condens. Matter

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The authors describe S=1/2 Ising-like magnetic chains completely in terms of domain walls. They formulate domain wall creation and annihilation operators as fermion operators and calculate the domain wall content of the ground state and of excited states. From exact results for finite chains and from the solution in the one-domain wall subspace they find that a single domain wall behaves like a free particle in a well. The transition between the two equivalent ground states of Ising-like S=1/2 chains is found to be dominated by quantum diffusion: the approach of the magnetization to the asymptotic behaviour is algebraic and not exponential. The analogy of this observation to interface fluctuations in the two-dimensional classical system is pointed out. For domain walls in the presence of impurities they study the phase shift and the transmission coefficient as well as the exact energy spectrum of finite impure lattices. To visualize the domain wall scattering they also demonstrate their real-time dynamics.

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