Helical Spin Ordering—1 Theory of Helical Spin Configurations

Nagamiya, Takeo

doi:10.1016/s0081-1947(08)60220-9

Cited by 126 publications

(58 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The molecular field theory predicts that H c > ( √ 2 − 1)H s . 31,32) In RbCuCl 3 , the transition field is H c ≈ (1/3)H s , which is lower than the lower limit ( √ 2 − 1)H s for the helix-fan transition. Thus at the moment, it too early to conclude that the transition at H c = 21.2 T corresponds to the helix-fan transition.…”

Section: 4 29)mentioning

confidence: 81%

See 1 more Smart Citation

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl₃

et al. 2001

View full text Add to dashboard Cite

The static and dynamic magnetic properties of an S = 1/2 stacked triangular antiferromagnet RbCuCl3 with a helical spin structure due to lattice distortion were investigated by magnetic susceptibility, high-field magnetization process and ESR measurements. The magnetic susceptibilities were analyzed by high-temperature expansion approximation in terms of ferromagnetic intrachain coupling and the antiferromagnetic interchain coupling. The magnetization saturates at Hs ≈ 66.8 T at 1.5 K, the value of which is twice that of CsCuCl3. A small magnetization jump indicative of a phase transition was observed at Hc = 21.2 T ≈ (1/3)Hs for H⊥c. ESR modes observed for H c are well described by the calculation based on the helical spin structure. From the present measurements, the ferromagnetic intrachain and two kinds of antiferromagnetic interchain exchange interactions, and the planar anisotropy energy were determined as J0/kB = 25.7 K, J1/kB = −10.6 K, J ′ 1 /kB = −17.4 K, and ∆J0/kB = −0.45 K, respectively. KEYWORDS: RbCuCl 3 , distorted triangular antiferromagnet, helical spin structure, susceptibility, high-field magnetization process, field-induced phase transition, ESR §1. Introduction Triangular antiferromagnets of the hexagonal ABX 3 type with the CsNiCl 3 structure exhibit a rich variety of magnetic phase transitions due to spin frustration and quantum fluctuation.1) Recently, the magnetic properties of CsCuCl 3 have been actively investigated. CsCuCl 3 exhibits field-induced phase transition for H c, which is caused by the competition between planar anisotropy and quantum fluctuation.2-4) A small amount of Co 2+ doped in CsCuCl 3 produces successive magnetic phase transitions, 5) and the low-temperature phase was found to be an oblique triangular antiferromagnetic phase in which spins form triangular structure in a plane tilted from the basal plane. 6)The magnetic properties of the closely related RbCuCl 3 have been less extensively studied. At high temperatures, RbCuCl 3 exhibits the highly symmetric CsNiCl 3 structure (space group P 6 3 /mmc). With decreasing temperature, RbCuCl 3 transforms into an orthorhombic structure (P bcn) at T t1 = 340 K and further into a monoclinic structure (C2) at T t2 = 260 K due to the Jahn-Teller effect.7, 8) RbCuCl 3 undergoes magnetic phase transition at T N ≈ 19 K.9) The magnetic susceptibility of RbCuCl 3 was first investigated by Tazuke et al.9) They analyzed their susceptibility data in terms of * E-mail: syuji@lee.phys.titech.ac.jp. * * E-mail: tanaka@lee.phys.titech.ac.jp.antiferromagnetic intrachain coupling and ferromagnetic interchain coupling. Recent neutron powder diffraction by Reehuis et al. 10) revealed that an incommensurate helical spin structure which is close to the 120• spin structure is realized in the basal plane as shown in Fig. 1, and that spins are arranged ferromagnetically along the c-axis. The spin structure is expressed by the ordering vector Q 0 = (0, 0.5985, 0) for the monoclinic representation and Q 0 = (0.2993, 0.2993, 0) for the hexagonal re...

show abstract

Section: 4 29)mentioning

confidence: 81%

“…The classical molecular field theory 31,32) predicts that a transition from a helical spin structure to a fan structure occurs, when an external field is applied in the easyplane. Thus, it is possible to attribute the field-induced phase transition at H c = 21.2 T for H ⊥ c to the helixfan transition.…”

Section: 4 29)mentioning

confidence: 99%

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl₃

et al. 2001

View full text Add to dashboard Cite

show abstract

“…Symmetry constrains and, more importantly, restrictions on the amplitude of the magnetic moments can reduce the number of solutions. A study of the different kinds of propagation vectors that can be combined in order to provide constant moment structures, among the study of the physical properties, was performed long time ago by Nagamiya [20]. Fortunately, nature often selects simple solutions and many magnetic structures have a single propagation vector, or display some symmetry constraints that reduce the complexity of the periodic magnetic structures given by (34).…”

Section: Limitations Of Neutron Scattering For Determining Magnetic Smentioning

confidence: 99%

Symmetry and magnetic structures

Rodrı́guez-Carvajal

Bourée

2012

EPJ Web of Conferences

View full text Add to dashboard Cite

“…(3.14) in Ref. 26 for its dependence on model parameters]. The magnitude of the sinusoidal wave vector Q is given by cos(Qb/2) = −J 0 /(2J 2b ).…”

Section: Model For Rmno3mentioning

confidence: 99%

Sinusoidal electromagnon inRMnO3: Indication of anomalous magnetoelectric coupling

Stenberg

Sousa

2012

Phys. Rev. B

View full text Add to dashboard Cite

The optical spectra in the family of multiferroic manganites RMnO3 is a great puzzle. Current models can not explain the fact that two strong electromagnons are present in the non-collinear spin cycloidal phase, with only one electromagnon surviving the transition into the collinear spin sinusoidal phase. We show that this is a signature of the presence of anomalous magnetoelectric coupling that breaks rotational invariance in spin space and generates oscillatory polarization in the ground state.

show abstract

Helical Spin Ordering—1 Theory of Helical Spin Configurations

Cited by 126 publications

References 51 publications

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl₃

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl₃

Symmetry and magnetic structures

Sinusoidal electromagnon inRMnO3: Indication of anomalous magnetoelectric coupling

Contact Info

Product

Resources

About

Helical Spin Ordering—1 Theory of Helical Spin Configurations

Cited by 126 publications

References 51 publications

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl3

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl3

Symmetry and magnetic structures

Sinusoidal electromagnon inRMnO3: Indication of anomalous magnetoelectric coupling

Contact Info

Product

Resources

About

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl₃

Susceptibility, Magnetization Process and ESR Studies on the Helical Spin System RbCuCl₃