Magnetization Process of a Screw Spin System

Nagamiya, Takeo; Nagata, Kazukiyo; Kitano, Yoshiharu

doi:10.1143/ptp.27.1253

Cited by 188 publications

(113 citation statements)

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“…Consequently, in order to understand the experimental results, it is very important to determine the value of H P . Following Nagamiya et al [39], this task can be simply accomplished. In Appendix A, we report the details of the calculation for H P in the case of the Gd(hfac) 3 NITEt chain, where the presence of two different kinds of spins was explicitly taken into account [13].…”

Section: A Role Of the External Magnetic Fieldmentioning

confidence: 99%

“…(B3) and (B4) can be solved in a perturbative way following Nagamiya and coworkers [36,39], i.e., letting…”

Section: A Weak Magnetic Fieldmentioning

confidence: 99%

“…Strong magnetic field: determination of the critical field H P Even in the presence of a strong magnetic field, we will generalize a theory first developed by Nagamiya et al [36,39], in order to treat the present case of two different kinds of spins, and two different values of the next-nearest-neighbor exchange coupling. For the sake of simplicity, the case of a single crystal sample will be considered hereafter.…”

Section: A Weak Magnetic Fieldmentioning

confidence: 99%

“…In the special case S = s and J z2 = J z2 , one readily observes that the maximum ofH P (q) is obtained for q = Q, where Q is the modulus of the critical wave vector of the helical ground state [36,39] in H = 0. In the more general case under study, the position of the maximum and Q do not coincide, as shown in Fig.…”

Section: A Weak Magnetic Fieldmentioning

confidence: 99%

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Proton NMR study of spin dynamics in the magnetic organic chainsM(hfac)3NITEt(M=Eu3+

et al. 2016

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In this work, we present a nuclear magnetic resonance (NMR) study of the spin dynamics in the rare-earth-based low-dimensional molecular magnetic chains Eu(hfac) 3 NITEt and Gd(hfac) 3 NITEt (in short, Eu-Et and Gd-Et). Although both samples are based on the same chemical building block, [(hfac) 3 NITEt], their magnetic properties change dramatically when the Eu 3+ ion, which is nonmagnetic at low temperatures, is substituted by the magnetic Gd 3+ ion. The present proton NMR investigation shows that, down to the lowest investigated temperature (T = 1.5 K for Gd-Et and T = 3 K for Eu-Et), the Eu-Et chain behaves as a one-dimensional Heisenberg model with antiferromagnetic exchange coupling (J = −20 K) between s = 1/2 organic radicals, and has a T -independent exchange frequency (ω e = 2.6 × 10 12 rad/s). In the Gd-Et chain, in contrast, a competition arises between nearest-neighbor ferromagnetic coupling and next-nearest-neighbor antiferromagnetic coupling; moreover, two phase transitions have previously been found, in agreement with Villain's conjecture: a first transition, at T 0 = 2.2 K, from a high temperature paramagnetic phase to a chiral spin liquid phase, and a second transition, at T N = 1.9 K, to a three-dimensional helical spin solid phase. Contrary to the Eu-Et chain (whose three-dimensional ordering temperature is estimated to insurge at very low, T N ≈ 0.3 K), critical spin dynamics effects have been measured in the Gd-Et chain on approaching T N = 1.9 K: namely, a divergence of the proton nuclear spin-lattice relaxation rate 1/T 1 , which in turn produces a sudden wipe-out of the NMR signal in a very narrow ( T ∼ 0.04 K) temperature range above T N . Below T N , an inhomogeneous broadening of the NMR line indicates a complete spin freezing. At T 0 = 2.2 K, instead, such critical effects are not observed because NMR measurements probe the two-spin correlation function, while the chiral spin liquid phase transition is associated with a divergence of the four-spin correlation function.

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Section: A Role Of the External Magnetic Fieldmentioning

confidence: 99%

“…(B3) and (B4) can be solved in a perturbative way following Nagamiya and coworkers [36,39], i.e., letting…”

Section: A Weak Magnetic Fieldmentioning

confidence: 99%

Section: A Weak Magnetic Fieldmentioning

confidence: 99%

Section: A Weak Magnetic Fieldmentioning

confidence: 99%

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Proton NMR study of spin dynamics in the magnetic organic chainsM(hfac)3NITEt(M=Eu3+

et al. 2016

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“…This is the first direct determination of the IC wave vector in phase IV. Since the strong magnetic field favors a flop of the spiral spin plane [18], it is plausible that the spins rotate within the plane that is normal to the field (easy) direction in phase IV. Indeed, according to structure factor considerations, this flop of the spiral plane explains very well the considerable reduction of the IC reflection intensity observed in phase IV (nearly half that within the AF2 phase).…”

mentioning

confidence: 99%

Neutron Laue Diffraction Study on the Magnetic Phase Diagram of MultiferroicMnWO4under Pulsed High Magnetic Fields

et al. 2011

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Spin Structures and Spin Wave Excitations

Zaliznyak

2007

Handbook of Magnetism and Advanced Magnetic Materials

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Electronic spin interactions and the resulting spin structures which give rise to various kinds of magnetism existing in many‐electron condensed matter systems are discussed. In most cases, spin structure and excitations in a spin system can be understood in the framework of semiclassical spin‐wave theory. Basic examples observed in magnetic neutron diffraction and inelastic magnetic neutron scattering experiments are presented and discussed with reference to such description. Relationship between the structure of the crystal lattice and spin arrangement and energy dispersion of spin excitations in the crystal are discussed and illustrated by some recent experimental results.

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Magnetization Process of a Screw Spin System

Cited by 188 publications

References 0 publications

Proton NMR study of spin dynamics in the magnetic organic chainsM(hfac)3NITEt(M=Eu3+

Proton NMR study of spin dynamics in the magnetic organic chainsM(hfac)3NITEt(M=Eu3+

Neutron Laue Diffraction Study on the Magnetic Phase Diagram of MultiferroicMnWO4under Pulsed High Magnetic Fields

Spin Structures and Spin Wave Excitations

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