High-field magnetization process in the triangular lattice antiferromagnet CuFeO2 up to 100 T

Ajiro, Yoshitami; Asano, Takayuki; Takagi, Toshimi; Mekata, Mamoru; Katori, Hiroko Aruga; Goto, T.

doi:10.1016/0921-4526(94)91051-0

Cited by 64 publications

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“…Though left unaddressed, a corresponding feature can also be observed around 52 T in the ͑dM / dB͒ vs B data previously recorded in a single turn-coil measurement up to 100 T ͑8 K͒. 26 At fields above both these transitions, M shows virtually isotropic behavior, growing ͑quasi͒linearly up to 58.3 T. This absence of anisotropy suggests a full symmetry recovery and thus retrieval of the undistorted triangular lattice at these fields.…”

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confidence: 78%

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High-field recovery of the undistorted triangular lattice in the frustrated metamagnetCuFeO2

Lummen

Strohm²,

Rakoto³

et al. 2009

Phys. Rev. B

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Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Lummen, T. T. A., Strohm, C., Rakoto, H., Nugroho, A. A., & van Loosdrecht, P. H. M. (2009 Pulsed-field magnetization experiments extend the typical metamagnetic staircase of CuFeO 2 up to 58 T to reveal an additional first-order phase transition at high field for both the parallel and perpendicular field configuration. Virtually complete isotropic behavior is retrieved only above this transition, indicating the high-field recovery of the undistorted triangular lattice. A consistent phenomenological rationalization for the field dependence and metamagnetism crossover of the system is provided, demonstrating the importance of both spin-phonon coupling and a small field-dependent easy-axis anisotropy in accurately describing the magnetization process of CuFeO 2 . Metamagnetism typically refers to any material that, upon variation in the externally applied magnetic field, exhibits an abrupt change in magnetization. In general, the phase diagrams of materials undergoing field-induced magnetic transitions can be rationalized according to the degree of magnetic anisotropy in the materials.1 In highly anisotropic systems, spins are effectively restricted to align ͑anti͒parallel to the magnetic easy-axis and magnetic transitions typically involve discontinuous spin reversals, leading to first-ordertype metamagnetic transitions. As for isotropic ͑weakly anisotropic͒ systems this directional restriction is relieved ͑strongly reduced͒, transitions in such materials often reflect the onset of a continuous, second-order-type reorientation of the local spins. Another source of exotic magnetic transitions is geometrical magnetic frustration, which occurs when a specific lattice geometry prevents the simultaneous minimization of all magnetic exchange interactions, thus introducing a high spin degeneracy.2 The simultaneous occurrence of both these phenomena and the interplay between them leads to intricate, diverse, and rich physics, yielding many captivating magnetic phases ranging from spin liquids and ices to multiferroic spiral phases. [3][4][5][6] Here the focus is on the delafossite semiconductor CuFeO 2 , an arche-type triangular lattice antiferromagnet, in which the Fe 3+ ions stack in hexagonal layers along the c axis ͓Fig. 1͑a͔͒. In spite of the expected Heisenberg nature of the Fe 3+ spins ͑3d 5 , S =5/ 2, and L =0͒, CuFeO 2 does not order in the noncollinear 120°spin configuration at low temperature. Instead, after undergoing successive phase transitions at T N1 Ϸ 14 K and T N2 Ϸ 11 K, lowering the symmetry from hexagonal ͑R3m͒ to monoclinic, 7-9 the system adopts a collinear, two-up two-down order, with moments aligned ͑anti͒parallel along the c axis ͓Fig. 1͑b͔͒ ͑Ref. 10͒. The collinear ground state is supposedly stabilized through the strong spin-lattice coupling in CuFeO 2 , 7-9,11 which induces a structural distortion through the "spin Jahn-Teller" effect. 12,13 Alternatively, this scalene triangle distorti...

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confidence: 78%

“…2, the magnetization process for both B ʈ c and B Ќ c shows a cascade of phase transitions, in excellent agreement with literature. 5,[15][16][17][18]26 As B ʈ increases, the spin system successively rearranges to the helical-ordered phase at B c1 ʈ Ӎ 7.2 T ͓Fig. 1͑c͔͒ and the collinear three-up two-down phase at B c2 ʈ Ӎ 13.0 T ͓Fig.…”

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confidence: 99%

High-field recovery of the undistorted triangular lattice in the frustrated metamagnetCuFeO2

Lummen

Strohm²,

Rakoto³

et al. 2009

Phys. Rev. B

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“…With the application of a field parallel to the c-axis, a series of new magnetic orders is stabilized below T N 2 . Between 7 T and 13 T, CuFeO 2 shows a proper screw spin configuration where the spins lie in the R3m mirror plane perpendicular to the magnetic modulation vector q [110] (hexagonal basis) [2,4,7,8]. At higher fields, several other spin configurations are observed: a c-axis collinear 5-sublattice (↑↑↑↓↓) state (13 T < H < 20 T), a c-axis collinear 3-sublattice (↑↑↓) structure (20 T < H < 34 T), a canted 3-sublattice state (34 T < H < 49 T), and a noncolinear incommensurate spin-flop phase which is close to the 120…”

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confidence: 99%

Raman scattering study of delafossite magnetoelectric multiferroic compounds: CuFeO₂and CuCrO₂

Aktas

Truong

Otani³

et al. 2011

J. Phys.: Condens. Matter

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Ultrasonic velocity measurements on the magnetoelectric multiferroic compound CuFeO2 reveal that the antiferromagnetic transition observed at TN1 = 14 K might be induced by an R3m C2/m pseudoproper ferroelastic transition [1]. In that case, the group theory states that the order parameter associated with the structural transition must belong to a two dimensional irreducible representation Eg (x 2 − y 2 , xy). Since this type of transition can be driven by a Raman Eg mode, we performed Raman scattering measurements on CuFeO2 between 5 K and 290 K. Considering that the isostructural multiferroic compound CuCrO2 might show similar structural deformations at the antiferromagnetic transition TN1 = 24.3 K, Raman measurements have also been performed for comparison. At ambient temperature, the Raman modes in CuFeO2 are observed at ωE g = 352 cm −1 and ωA g = 692 cm −1 , while these modes are detected at ωE g = 457 cm −1 and ωA g = 709 cm −1 in CuCrO2. The analysis of the temperature dependence of modes shows that the frequency of all modes increases down to 5 K. This typical behavior can be attributed to anharmonic phonon-phonon interactions. These results clearly indicate that none of the Raman active modes observed in CuFeO2 and CuCrO2 drive the pseudoproper ferroelastic transition observed at the Néel temperature TN1. Finally, a broad band at about 550 cm −1 observed in the magnetoelectric phase of CuCrO2 below TN2 could be attributed to a magnon mode.

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“…As many as five spin-flop like magnetisation anomalies have been observed for a field applied along the c-axis (at 8, 13, 22, 26, 42 and 70 T) 12 , while for H ⊥ c, a phase transition has been found at 24 T. Monte Carlo simulation results have suggested that in order for a collinear structure to be stable in zero field 10 and also undergo several phase transitions in applied field, the second neighbour exchange, J 2 , as well as the third neighbour exchange, J 3 , have to be unusually strong in comparison with the main nearest-neighbour exchange interaction J 1 : J 2 /J 1 =0.5 and J 3 /J 1 =0.75. Although a theoretical model with such parameters produces a somewhat similar magnetisation curve, comparable values of the exchange interactions J 1 and J 3 for magnetic moments separated by twice the distance seems to be suspicious.…”

Section: Introductionmentioning

confidence: 99%

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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High-field magnetization process in the triangular lattice antiferromagnet CuFeO2 up to 100 T

Cited by 64 publications

References 1 publication

High-field recovery of the undistorted triangular lattice in the frustrated metamagnetCuFeO2

High-field recovery of the undistorted triangular lattice in the frustrated metamagnetCuFeO2

Raman scattering study of delafossite magnetoelectric multiferroic compounds: CuFeO₂and CuCrO₂

High magnetic field behaviour of the triangular lattice antiferromagnet, CuFeO2

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High-field magnetization process in the triangular lattice antiferromagnet CuFeO2 up to 100 T

Cited by 64 publications

References 1 publication

High-field recovery of the undistorted triangular lattice in the frustrated metamagnetCuFeO2

High-field recovery of the undistorted triangular lattice in the frustrated metamagnetCuFeO2

Raman scattering study of delafossite magnetoelectric multiferroic compounds: CuFeO2and CuCrO2

High magnetic field behaviour of the triangular lattice antiferromagnet, CuFeO2

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Raman scattering study of delafossite magnetoelectric multiferroic compounds: CuFeO₂and CuCrO₂