On the field-dependent magnetic structures of CsCuCl<sub>3</sub>

Schotte, U.; Stüßer, N.; Schotte, K. D.; Weinfurter, Harald; Mayer, H. M.; Winkelmann, M.

doi:10.1088/0953-8984/6/46/026

Cited by 23 publications

(28 citation statements)

References 17 publications

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“…The discontinuity [13][14][15] in the low-T magnetization at H ≈ 0.4 H S was shown by Nikuni and Shiba 16,17 to be a novel, fluctuationinduced phase transition from the umbrella structure (optimal at small H due to a small, easy-plane anisotropy 18 in the intrachain exchange) to a coplanar structure (optimal at larger H due to quantum fluctuations). Further experiments [19][20][21][22][23] , including neutron-diffraction 24 and specific-heat measurements 12 near T N , confirmed their analysis.…”

Section: Introductionsupporting

confidence: 58%

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Nikuni

Jacobs

1998

Phys. Rev. B

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In low magnetic field, the stacked, triangular antiferromagnet CsCuCl 3 has a helical structure incommensurate (IC) in the chain direction. The IC wavenumber (from neutron-diffraction experiments) decreases with increasing field transverse to the chains, as predicted by classical theory, but then it has a plateau almost certainly caused by quantum fluctuations. Linear spinwave theory fails because fluctuations have particularly large effects in the IC phase. An innovative phenomenological treatment of quantum fluctuations yields a plateau at approximately the observed value and the observed fields; it predicts a transition to the commensurate phase so far not observed. Results depend sensitively on a weak anisotropy. 64.70.Rh, 75.10.Jm, 75.25.+z, 75.50.Ee

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Section: Introductionsupporting

confidence: 58%

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Nikuni

Jacobs

1998

Phys. Rev. B

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“…Mekata et al obtained β = 0.25±0.01 while Stüsser et al obtained [102] β = 0.23 ± 0.02, which were close to the n = 2 chiral value and that of CsMnBr 3 . By contrast, Weber et al observed in the temperature range 10 −3 <| t |< 5 × 10 −2 a power-law scaling behavior in the specific heat characterized by α = 0.35 ± 0.05 and A + /A − = 0.29 ± 0.05 close to the n = 2 chiral values, but observed a deviation from this scaling behavior in a closer vicinity of T c .…”

Section: (B) Helimagnetssupporting

confidence: 52%

Untitled

Kawamura¹

1998

J. Phys.: Condens. Matter

342

470

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Recent theoretical and experimental studies on the critical properties of frustrated antiferromagnets with the noncollinear spin order, including stacked-triangular antiferromagnets and helimagnets, are reviewed. Particular emphasis is put on the novel critical and multicritical behaviors exhibited by these magnets, together with an important role played by the 'chirality'. §1. Introduction Phase transitions and critical phenomena have been a central issue of statistical physics for many years. In particular, phase transitions of magnets or of 'spin systems' have attracted special interest. Thanks to extensive theoretical and experimental studies, we now have rather good understanding of the nature of phase transitions of standard ferromagnets and antiferromagnets. By the term 'standard', I mean here regular and unfrustrated magnets without quenched disorder and frustration. They include ferromagnets and unfrustrated antiferromagnets with the collinear spin order.One key notion which emerged through these studies is the notion of universality. According to the universality hypothesis, a variety of continuous (or secondorder) phase transitions can be classified into a small number of universality classes determined by a few basic properties characterizing the system under study, such as the space dimensionality d, the symmetry of the order parameter and the range of interaction. If one is interested only in the so-called universal quantities, such as critical exponents, amplitude ratios and scaled equation of state, various phase transitions should exhibit exactly the same behavior. In the case of standard bulk magnets in three spatial dimensions (d = 3), universality class is basically determined by the number of the spin components, n. Physically, the index n is related to the type of magnetic anisotropy: Namely, n = 1 (Ising), n = 2 (XY ) and n = 3 (Heisenberg) correspond to magnets with easy-axis-type anisotropy, easy-plane-type anisotropy and no anisotropy (isotropic magnets), respectively. The critical properties associated with these n-component O(n) universality classes have been extensively studied and are now rather well understood. From the renormalization-group (RG) viewpoint, these critical properties are governed by the so-called Wilson-Fisher O(n) fixed point.

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“…CsCuCl 3 exhibits field-induced phase transition for H c, which is caused by the competition between planar anisotropy and quantum fluctuation. [2][3][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.…”

Section: §1 Introductionmentioning

confidence: 99%

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

et al. 2001

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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...

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On the field-dependent magnetic structures of CsCuCl₃

Cited by 23 publications

References 17 publications

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

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

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On the field-dependent magnetic structures of CsCuCl3

Cited by 23 publications

References 17 publications

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

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

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On the field-dependent magnetic structures of CsCuCl₃

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