Uniaxial-Pressure Control of Magnetic Phase Transitions in a Frustrated Magnet CuFe1-xGaxO2 (x=0, 0.018)

Nakajima, Tsuyoshi; Mitsuda, Setsuo; Takahashi, Keiichiro; Yoshitomi, Keisuke; Masuda, Kazunori; Kaneko, Chikafumi; Honma, Yasuko; Kobayashi, Satoru; Kitazawa, Hideaki; Kosaka, Masashi; Aso, Naofumi; Uwatoko, Yoshiya; Terada, Noriki; Wakimoto, Shuichi; Takeda, M.; Kakurai, Kazuhisa

doi:10.1143/jpsj.81.094710

Cited by 17 publications

(22 citation statements)

References 28 publications

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“…2(a), which is linear extension of the previous result. 18 We have also found that the application of p = 600 MPa results in the upward shift of T N2 by ∼ 1 K, whereas the upward shift of T N2 is only ∼ 0.2 K up to 80…”

Section: Methodssupporting

confidence: 52%

“…16,17,27 On the other hand, Nakajima et al performed neutron diffraction, synchrotron x-ray diffraction and magnetic susceptibility measurements under an "anisotropic" uniaxial pressure up to 100 MPa along the [110] direction, which is conjugate direction to the spontaneous lattice distortion in CFO. 18,19 They observed the upward shift of T N1 , which can be interpreted as a result of partial release of the spin frustration in this system by assistance of the spontaneous lattice distortion, and accompanied increment of structural transition temperature. Taking into account that uniaxial pressure, p, brakes the lattice symmetry, one can expect that a change in a ratio of the exchange constants by applied p is larger than those by the isotropic pressure, and that q 0 , which should reflect the ratio of the exchange constants, also shows larger change.…”

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confidence: 84%

“…[16][17][18][19] Because the lattice symmetry is broken by the spontaneous lattice distortion just at the phase transition temperature T N1 , one expects that the application of pressure at this temperature provides a significant influence for the magnetic properties of CFO. Thus, we focus on an applied-pressure-impact on the exchange constants at T N1 , hereafter, while pressure effects on the collinear 4SL magnetic structure at the low temperature should be fascinating objects.…”

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confidence: 99%

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Uniaxial pressure effects on spin-lattice coupled phase transitions in a geometrical frustrated magnet CuFeO2

et al. 2016

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We have performed magnetic susceptibility, dielectric constant, neutron diffraction and synchrotron radiation x-ray diffraction measurements on a spin-lattice coupling system CuFeO 2 under applied uniaxial pressure p up to 600 MPa. We have found that the phase transition temperature T N1 from the paramagnetic phase to the partially disordered phase increases by as many as 5 K from original T N1 ≃ 14 K under applied p of 600 MPa and that a lattice constant b m of CuFeO 2 remarkably changes. In contrast, the value of q 0 , which is a magnetic modulation wave number at T N1 and should reflect ratios of the exchange coupling constants, is not changed even by applied p of 600 MPa. Based on these results, we show that the explanation using only the exchange striction effect is not suitable for the magnetic phase transition in CuFeO 2 . These results suggest that a lattice degree of freedom via spin-lattice coupling is indispensable for determination of magnetic properties of CuFeO 2 . Dielectric anomaly under applied p of 600 MPa is also briefly discussed.

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confidence: 52%

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confidence: 84%

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confidence: 99%

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Uniaxial pressure effects on spin-lattice coupled phase transitions in a geometrical frustrated magnet CuFeO2

et al. 2016

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“…The samples were cut into plates with dimensions of 1.3 × 2.0 × 0.9 mm 3 (weight 12.3 mg) for the magnetization measurements and with dimensions of 2.5 × 2.2 × 2.1 mm 3 (weight 61.6 mg) for the neutron diffraction measurements. The dc magnetic measurements were performed using a commercial superconducting quantum interference device (SQUID) magnetometer (Quantum Design MPMS-XL), and a uniaxial pressure P was applied along the a axis, using a stick-type piston-cylinder pressure cell [17], which was inserted in the magnetometer. This pressure cell enabled us to monitor the applied pressure in situ using a load meter and to vary it at low temperatures, while keeping the sample inside the magnetometer.…”

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confidence: 99%

“…These studies reveal the significant effect of hydrostatic pressure as regards the modification of exchange interactions in TLAs, however, the controllability of the exchange interaction ratio γ is limited because of the isotropic nature of the hydrostatic pressure. In parallel to these studies, some attempts to anisotropically control the triangular geometry of the spins using uniaxial pressure have been made for single TLA crystals such as RbMnBr 3 [28] and CuFeO 2 [17,[29][30][31]. By changing the uniaxial-pressure direction with respect to the crystal axis, it may be possible to increase, decrease, and tune the ratio of the exchange interactions on a triangular lattice in a controllable way.…”

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confidence: 99%

Uniaxial-pressure control of geometrical spin frustration in an Ising antiferromagnetCoNb2O6via anisotropic deformation of the isosceles lattice

et al. 2014

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We report neutron diffraction measurement results for an Ising antiferromagnet CoNb 2 O 6 under uniaxial pressure along the geometrically frustrated isosceles-triangular-lattice direction. We find that an onset incommensurate wave number at the Néel temperature increases with pressure from 0.378 to 0.411 at 400 MPa. The observations suggest that the anisotropic deformation of the lattice by the uniaxial pressure significantly modifies the spin frustration, leading to an increase in the nearest-neighbor to next-nearest-neighbor interaction ratio from 1.33 to 1.81.Geometrically frustrated triangular-lattice antiferromagnets (TLAs) have been attracting considerable interest because of their diverse phase transitions and critical phenomena [1,2] as well as the recent discovery of multiferroics properties in some TLAs [3][4][5]. For an ideal two-dimensional (2D) triangular lattice with a nearest-neighbor antiferromagnetic interaction, no long-range magnetic order occurs in the case of Ising spins, even at T = 0 K, owing to macroscopic degeneracy of the ground state, whereas a 120 • structure is expected to be stabilized at T = 0 K for Heisenberg or XY-type spins. On the other hand, real TLAs usually exhibit magnetic orders at nonzero temperature, irrespective of spin type, and the phase transition is three dimensional in nature due to the stacking structure of the frustrated triangular lattice. Moreover, there exist other microscopic interactions, such as further-neighbor and dipole-dipole interactions, which reduce the degeneracy of the ground state. Nevertheless, the triangular geometrical frustration does dominate the magnetic order and diverse magnetic features have been experimentally determined in a variety of TLAs [2].A partial releasing of the triangular geometrical frustration due to an orthorhombic distortion also has pronounced effects on magnetic ordering. This distortion splits J on a triangular lattice into two inequivalent antiferromagnetic interactions, J 1 and J 2 , on an isosceles-triangular lattice, as shown in Fig. 1(b). Theoretical investigation of a 2D Ising isosceles-triangular lattice revealed interesting magnetic features, which depend on the interaction ratio, γ = J 1 /J 2 [6-8]. Simple long-range antiferromagnetism is achieved for γ < 1.0 of the triangular lattice, whereas for γ > 1.0 the system only shows a longrange order at T = 0 K, with decoupled chains along the J 1 direction. Above this temperature, magnetic correlations between the chains and an incommensurate magnetic order are seen. The investigation of magnets with geometrically * koba@iwate-u.ac.jp frustrated isosceles-triangular lattices is of great importance, because such a system does not simply belong to the intermediate case between the geometrically frustrated TLA and unfrustrated magnet, but it also has the potential to exhibit unusual magnetic features absent in both magnets.In this Rapid Communication, we report the results of neutron diffraction measurements on an isosceles-triangularlattice Ising antiferromagnet, CoNb ...

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CuFeO2

Kanomata¹,

Note²

2023

High Pressure Materials Properties: Magnetic Properties of Oxides Under Pressure

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Uniaxial-Pressure Control of Magnetic Phase Transitions in a Frustrated Magnet CuFe_1-xGa_xO₂ (x=0, 0.018)

Cited by 17 publications

References 28 publications

Uniaxial pressure effects on spin-lattice coupled phase transitions in a geometrical frustrated magnet CuFeO2

Uniaxial pressure effects on spin-lattice coupled phase transitions in a geometrical frustrated magnet CuFeO2

Uniaxial-pressure control of geometrical spin frustration in an Ising antiferromagnetCoNb2O6via anisotropic deformation of the isosceles lattice

CuFeO2

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