Magnetic ordering of CuFe1−xAlxO2

Mitsuda, Setsuo; Matsumoto, Y.; Wada, T.; Kurihara, Koutarou; Urata, Y.; Yoshizawa, H.; Mekata, Mamoru

doi:10.1016/0921-4526(95)00102-f

Cited by 12 publications

(5 citation statements)

References 2 publications

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“…Then, the PD state was interpreted by a Monte-Carlo (MC) simulation study 5) of the 2D Ising spin TLA model with competing exchange interactions up to 3rd neighbors and was confirmed by entropy analysis in specific heat experiments. 7) However, the propagation wave number q of the intermediatetemperature phase is not exactly 1 5 but is temperature dependent as was revealed in our later powder neutron diffraction study 8) of CuFe 1−x Al x O 2 . In this report, we present the results of neutron diffraction studies using single crystals as well as those of the reinvestigation of the MC simulation, 9) in which the magnetic structure of the intermediate-temperature phase was identified as a quasi-long range ordered incommensurate spin density wave (SDW) with temperature dependent propagation wave vector.…”

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confidence: 75%

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Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO₂

et al. 1998

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We reinvestigated successive magnetic phase transitions (T N1 ∼ 14.0 K, T N2 ∼ 10.5 K) in a frustrated triangular lattice antiferromagnet (TLA) CuFeO 2 by neutron diffraction measurements using single crystals. The magnetic structure of the intermediate-temperature phase between T N1 and T N2 is found to be a quasi-long range ordered sinusoidally amplitude-modulated structure with a temperature dependent propagation wave vector (q q 0). These features of successive phase transitions are well explained by reinvestigated Monte-Carlo simulation of a 2D Ising TLA with competing exchange interactions up to 3rd neighbors, in spite of the Heisenberg spin character of orbital singlet Fe 3+ magnetic ions.

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confidence: 75%

“…3(a), the temperature dependence of the propagation wave number q does not show lock-in behavior at q = 1 5 in the intermediate-temperature phase, which is consistent with previous powder neutron scattering experiments. 8) This means that the intermediatetemperature phase not commensurate but an incommensurate phase. Moreover, as is seen in Fig.…”

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confidence: 99%

Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO₂

et al. 1998

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“…14) On the other hand, the substitution of non-magnetic Al 3þ impurity on the Fe 3þ site dramatically changes the magnetic properties of CuFe 1Àx Al x O 2 . [15][16][17][18][19][20] Our recent studies have shown that the quasi-Ising character disappears with the substitution of a small amount, x ¼ 0:02, of non-magnetic Al 3þ impurity. The disappearance of the quasi-Ising character was suggested by following results: (i) the low temperature foursublattice ground state vanishes, and a low-temperature (LT) complex incommensurate state with three wave numbers (q, q 0 and 1=2 À q 0 ) is stabilized; 18) (ii) the magnetization plateaus observed in the magnetization process of CuFeO 2 , reflecting the strong Ising anisotropy, entirely vanishes in the x ¼ 0:02 sample; 19) (iii) in the spin-wave dispersion relations, one of the spin-wave branches with an energy gap for CuFeO 2 softens, and the gap goes to zero as a result of the substitution.…”

Section: Introductionmentioning

confidence: 98%

Reinvestigation of Magnetic Structures for the Thermally Induced States of CuFe_1-xAl_xO₂(x=0.00, 0.02 and 0.05) Using a Four-Circle Neutron Diffractometer

et al. 2005

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We have reinvestigated the effect of non-magnetic impurity on thermally-induced magnetic orderings in geometrically frustrated triangular lattice antiferromagnets CuFe 1Àx Al x O 2 with x ¼ 0:00, 0.02 and 0.05, using a four-circle neutron diffractometer. Although we inferred in our previous work with a threeaxis diffractometer that a proper screw type magnetic structure is realized in the intermediatetemperature (IM) phase of the samples with x ¼ 0:02 and x ¼ 0:05, in the present work we found that a sinusoidally amplitude-modulated magnetic structure with the magnetic moments canted by about 50 from the c axis toward the hexagonal h1 1 10i direction is realized. These experimental findings suggest that the quasi-Ising magnetic orderings in CuFeO 2 are stabilized not with the strong Ising anisotropy expected from the Ising-like successive magnetic phase transitions in CuFeO 2 but with the small Ising anisotropy added to strongly competing exchange interactions.

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“…20) The chemical impurity effect on the magnetic properties of CuFeO 2 has also been studied. [14][15][16][17][18][19][20][21] In particular, nonmagnetic impurity strongly affects the magnetic properties of CuFe 1Àx Al x O 2 by disturbing the delicate balance of the competing exchange interactions. In recent years, we have studied this non-magnetic impurity effect with good quality single-crystals.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Phase Diagram of the Triangular Lattice Antiferromagnet CuFe_1-xAl_xO₂

et al. 2005

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We study the phase diagram of the triangular-lattice Q-state Potts model in the real (Q, v)-plane, where v = e J − 1 is the temperature variable. Our first goal is to provide an obviously missing feature of this diagram: the position of the antiferromagnetic critical curve. This curve turns out to possess a bifurcation point with two branches emerging from it, entailing important consequences for the global phase diagram. We have obtained accurate numerical estimates for the position of this curve by combining the transfer-matrix approach for strip graphs with toroidal boundary conditions and the recent method of critical polynomials. The second goal of this work is to study the corresponding A p−1 RSOS model on the torus, for integer p = 4, 5,. .. , 8. We clarify its relation to the corresponding Potts model, in particular concerning the role of boundary conditions. For certain values of p, we identify several new critical points and regimes for the RSOS model and we initiate the study of the flows between the corresponding field theories.

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Magnetic ordering of CuFe1−xAlxO2

Cited by 12 publications

References 2 publications

Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO₂

Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO₂

Reinvestigation of Magnetic Structures for the Thermally Induced States of CuFe_1-xAl_xO₂(x=0.00, 0.02 and 0.05) Using a Four-Circle Neutron Diffractometer

Magnetic Phase Diagram of the Triangular Lattice Antiferromagnet CuFe_1-xAl_xO₂

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Magnetic ordering of CuFe1−xAlxO2

Cited by 12 publications

References 2 publications

Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO2

Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO2

Reinvestigation of Magnetic Structures for the Thermally Induced States of CuFe1-xAlxO2(x=0.00, 0.02 and 0.05) Using a Four-Circle Neutron Diffractometer

Magnetic Phase Diagram of the Triangular Lattice Antiferromagnet CuFe1-xAlxO2

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Product

Resources

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Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO₂

Partially Disordered Phase in Frustrated Triangular Lattice Antiferromagnet CuFeO₂

Reinvestigation of Magnetic Structures for the Thermally Induced States of CuFe_1-xAl_xO₂(x=0.00, 0.02 and 0.05) Using a Four-Circle Neutron Diffractometer

Magnetic Phase Diagram of the Triangular Lattice Antiferromagnet CuFe_1-xAl_xO₂