Neutron diffraction study of triangular lattice antiferromagnet CuFeO2 under high magnetic field

Mitsuda, Setsuo; Uno, Takahiro; Mase, Motoshi; Nojiri, Hiroyuki; Takahashi, Kohki; Motokawa, M.; Arai, M.

doi:10.1016/s0022-3697(99)00096-7

Cited by 25 publications

(26 citation statements)

References 6 publications

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“…Our main experimental efforts were focused on the properties of the low-temperature (LT) collinear phase in a magnetic field applied either parallel or perpendicular to the c-axis. We find that contrary to previous suggestions 6,12 a field-induced phase transition from a collinear 4-sublattice state to a 5-sublattice state occurs only when an applied magnetic field exceeds the value of the second critical field, H c2 ≈ 13.2 T, rather than the first one, H c1 ≈ 7.6 T. The exact nature of the phase transition at H c2 , however, remains unclear.…”

Section: Introductioncontrasting

confidence: 98%

“…An earlier powder neutron diffraction study 8 claimed to observe two successive magnetic transitions at T N 1 = 16 K and T N 2 = 10 K to a collinear spin structure with a monoclinic unit cell ( √ 7a × √ 7a × 2c, five spins in a layer) and an orthorhombic unit cell ( √ 3a × 2a × 2c, four spins in a layer) respectively 9 . All the spins were found to be parallel to the c-axis and an Ising nature for the exchange interactions has been suggested, although that would be unusual for the 6 S state of Fe 3+ ions. Further neutron powder diffraction measurements as well as the single crystal susceptibility and Mössbauer effect studies 10 also showed two successive phase transitions, however it was suggested that the intermediate temperature (IT) phase is a partially disordered phase, where 1/5 of the magnetic moments remain paramagnetic.…”

Section: Introductionmentioning

confidence: 92%

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High magnetic field behaviour of the triangular lattice antiferromagnet, CuFeO2

Petrenko

Lees

Paul

et al. 2001

Journal of Magnetism and Magnetic Materials

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The high magnetic field behaviour of the triangular lattice antiferromagnet CuFeO2 is studied using single crystal neutron diffraction measurements in a field of up to 14.5 T and also by magnetisation measurements in a field of up to 12 T. At low temperature, two well-defined first order magnetic phase transitions are found in this range of applied magnetic field (H c): at Hc1 = 7.6(3)/7.1(3) T and Hc2 = 13.2(1)/12.7(1) T when ramping the field up/down. In a field above Hc2 the magnetic Bragg peaks show unusual history dependence. In zero field TN1 = 14.2(1) K separates a high temperature paramagnetic and an intermediate incommensurate structure, while TN2 = 11.1(3) K divides an incommensurate phase from the low-temperature 4-sublattice ground state. The ordering temperature TN1 is found to be almost field independent, while TN2 decreases noticeably in applied field. The magnetic phase diagram is discussed in terms of the interactions between an applied magnetic field and the highly frustrated magnetic structure of CuFeO2.

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Section: Introductioncontrasting

confidence: 98%

Section: Introductionmentioning

confidence: 92%

High magnetic field behaviour of the triangular lattice antiferromagnet, CuFeO2

Petrenko

Lees

Paul

et al. 2001

Journal of Magnetism and Magnetic Materials

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“…The characteristics of the magnetic fields and generators are summarized in Table I. Several experiments have been made and the usefulness of the method has been established [2,3]. It takes more than 10 h to accumulate data acquisition for one Bragg peak at fixed scattering angle and at a fixed magnetic field value.…”

Section: Present Stagementioning

confidence: 99%

Pulsed High Magnetic Fields for Neutron and X-ray Scattering Experiments

Nojiri

2004

Journal of Neutron Research

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Feasibility of various types of pulsed magnetic field generators for neutron scattering and X-ray scattering is discussed. Both, a conventional single shot type pulsed field and repeating type pulsed field generators are considered. As a new approach, a miniature type generator is also proposed. The characteristics of possible magnetic fields such as time structure, intensity and interval between shots are compared by considering the requests for the spectrometer in which a high field coil is installed.

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“…Currently, the highest magnetic field for neutron scattering experiments was B=25 T, which was performed by Motokawa et al using a repeating pulsed magnet in Neutron Science Laboratory of High Energy Accelerator Research Organization in Japan [1,2]. However, neutron scattering experiments over B=10 T are still difficult and limited for the present; therefore, easier and more diffusive techniques are ambition.…”

Section: Introductionmentioning

confidence: 99%