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Kim, Bongjae; Kim, Beom Hyun; Kim, Kyoo; Choi, Hong Chul; Sang-Yeon, Park; Jeong, Yong-Jin; Min, B. I.

doi:10.1103/physrevb.85.220407

Cited by 35 publications

(30 citation statements)

References 40 publications

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“…We point out that the 2k solution is inconsistent with this value. On the other hand, the phase separation model produces M b = 3.04(9) µ B /Co, in excellent agreement with magnetization, XMCD data, as well as theoretical predictions 18,19,21,26,29,31 .…”

Section: Resultssupporting

confidence: 79%

Unconventional magnetic phase separation in γ-CoV2O6

et al. 2017

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We have explored the magnetism in the non-geometrically frustrated spin-chain system γ-CoV2O6 which possesses a complex magnetic exchange network. Our neutron diffraction patterns at low temperatures (T T N = 6.6 K) are best described by a model in which two magnetic phases coexist in a volume ratio 65(1) : 35(1), with each phase consisting of a single spin modulation. This model fits previous studies and our observations better than the model proposed by Lenertz et al in J. Phys. Chem. C 118, 13981 (2014), which consisted of one phase with two spin modulations. By decreasing the temperature from T N , the minority phase of our model undergoes an incommensuratecommensurate lock-in transition at T * = 5.6 K. Based on these results, we propose that phase separation is an alternative approach for degeneracy-lifting in frustrated magnets.

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Section: Resultssupporting

confidence: 79%

Unconventional magnetic phase separation in γ-CoV2O6

et al. 2017

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“…α-CoV 2 O 6 differs from rocksalt CoO where a large exchange constant induces strong mixing between the j eff spin-orbit levels [48][49][50]. The local crystalline distortion further supports an Ising anisotropy in the spin orientation [51,52], evidenced by a gap in the magnetic dynamics and also the critical scattering discussed below.…”

Section: Introductionmentioning

confidence: 67%

Metastable and localized Ising magnetism in α−CoV2O6 magnetization plateaus

et al. 2020

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α-CoV 2 O 6 consists of j eff = 1 2 Ising spins located on an anisotropic triangular motif with magnetization plateaus in an applied field. We combine neutron diffraction with low temperature magnetization to investigate the magnetic periodicity in the vicinity of these plateaus. We find these steps to be characterized by metastable and spatially short-range (ξ ∼ 10 Å) magnetic correlations with antiphase boundaries defining a local periodicity of T 2 = ↑↓ to T 3 = ↑↑↓ and T 4 = ↑↑↓↓ or ↑↑↑↓ spin arrangements. This shows the presence of spatially short range and metastable/hysteretic, commensurate magnetism in Ising magnetization steps.

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“…We carried out DFT calculations for CoV 2 O 6 in the non-magnetic state using the FPLO code and obtained Co 3d partial density of states (PDOS) very similar to those of Kim et al. 15 . The first moments of the Co-3d-dominated PDOS yield effective crystal field values of 10Dq= 0.52 eV (splitting between the e g and t 2g orbitals) , ∆t 2g =0.06 eV (the splitting of the d x 2 −y 2 orbital with respect to the d xz /d yz orbitals), and ∆e g =-0.24 eV (lowering the d xy orbital with respect to the d 3z 2 −r 2 orbital) for α-CoV 2 O 6 .…”

mentioning

confidence: 90%

“…To explain the large L z in α-CoV 2 O 6 , the e g orbitals have to be taken into account. 15 The mixing of d xy and d x 2 −y 2 orbitals brings d ±2 orbital character into the ground state and enhances the orbital moment. For a given spin-orbit coupling strength, the amount of the admixture depends on the type of the CoO 6 distortion, namely the energy splitting of the five 3d orbitals.…”

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confidence: 99%

Spectroscopic evidence for exceptionally high orbital moment induced by local distortions inα-CoV2O6

Hollmann

Agrestini

et al. 2014

Phys. Rev. B

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We present a combined experimental and theoretical study on the local magnetism of the Co ions in the spin-chain compound CoV2O6, which crystallizes in two different allotropic phases, α-and γ-CoV2O6. Using x-ray magnetic circular dichroism, we have found a very large and a moderate orbital contribution to the magnetism in α-CoV2O6 and γ-CoV2O6, respectively. Fullmultiplet calculations indicate that the differences in the magnetic behavior of α-and γ-CoV2O6 phases originate from different local distortions of the CoO6 octahedra. In particular, the strong compression of the CoO6 octahedra in α-CoV2O6 lead to a strong mixture of t2g and eg orbitals which, via the local atomic Coulomb and exchange interactions, results in an exceptionally large orbital moment.

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Unusual magnetic properties induced by local structure in a quasi-one-dimensional Ising chain system:α-CoV2O6

Cited by 35 publications

References 40 publications

Unconventional magnetic phase separation in γ-CoV2O6

Unconventional magnetic phase separation in γ-CoV2O6

Metastable and localized Ising magnetism in α−CoV2O6 magnetization plateaus

Spectroscopic evidence for exceptionally high orbital moment induced by local distortions inα-CoV2O6

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