Site-selective quantum correlations revealed by magnetic anisotropy in the tetramer system SeCuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>

Živković, Ivica; Djokić, Dejan M.; Herak, Mirta; Pajić, Damir; Prša, Krunoslav; Pattison, Phil; Dominko, Damir; Micković, Zlatko; Cinčić, Dominik; Forró, Lászlø; Berger, H.; Rønnow, Henrik M.

doi:10.1103/physrevb.86.054405

Cited by 20 publications

(64 citation statements)

References 29 publications

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“…This is in stark contrast to a gradual increase for µ 0 H ⊥ a. The orientation-dependent magnetic behavior is also observed in the temperature dependence of magnetic susceptibility anisotropy 19 . This indicates the significant role of anisotropic exchange interactions and ferromagnetic interactions.…”

Section: Methodsmentioning

confidence: 80%

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Anomalous spin dynamics in the coupled spin tetramer systemCuSeO3

Lee

Tol

et al. 2017

Phys. Rev. B

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We report high-field magnetization, high-frequency electron spin resonance (ESR), and 77 Se nuclear magnetic resonance (NMR) measurements on the linear spin tetramer system CuSeO 3 , consisting of strongly interacting Cu(1) dimers and weakly coupled Cu(2) spins. The magnetization exhibits anisotropic half-step magnetization plateaux at µ 0 H = 45 T, depending on a crystallographic orientation. A temperature dependence of the ESR linewidth ∆H pp in a paramagnetic phase points towards the significance of anisotropic exchange interactions. Below T N = 9 − 10 K long-range magnetic order is evidenced by the observation of a critical divergence of both ∆H pp (T ) and the nuclear spin-lattice relaxation rate 1/T 1 . In addition, we identify a magnetic anomaly at T * = 6.0(5) K below T N , which is caused by a spin reorientation. The nuclear spin-spin relaxation rate 1/T 2 unveils the development of site-specific spin correlations. The intriguing magnetism of CuSeO 3 is discussed in terms of the energy hierarchy of Cu(1) and Cu(2) spins in concert with additional intertetramer interactions.

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Section: Methodsmentioning

confidence: 80%

“…CuSeO 3 is regarded as a prime candidate for the coupled tetramer system, which is placed in the magnetically ordered side 19,20 . CuSeO 3 has a monoclinic P 2 1 /n crystal structure with two inequivalent Cu(1) and Cu (2) at T * = 6 K and the development of site-specific spin correlations.…”

Section: Introductionmentioning

confidence: 99%

Anomalous spin dynamics in the coupled spin tetramer systemCuSeO3

Lee

Tol

et al. 2017

Phys. Rev. B

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“…At 8 K the signal disappeared due to the establishment of long-range antiferromagnetic (AFM) order observed previously. 13 ESR spectra were recorded at 5 • steps and the rotation was controlled by a home-made goniometer with the accuracy of 1 • . In both torque and ESR measurements the uncertainty of ≈ 3 • was related to the optimal deposition of the crystal on the quartz sample holder.…”

Section: Methodsmentioning

confidence: 99%

“…1(a)]. 13 Cu1 ions form dimers by edge sharing of two oxygen atoms from coordination square (orange CuO 4 squares in Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic anisotropy of the spin tetramer systemSeCuO3studied by torque magnetometry and ESR spectroscopy

et al. 2014

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We present an experimental study of macroscopic and microscopic magnetic anisotropy of a spin tetramer system SeCuO 3 using torque magnetometry and ESR spectroscopy. Large rotation of macroscopic magnetic axes with temperature observed from torque magnetometry agrees reasonably well with the rotation of the g tensor above T 50 K. Below 50 K, the g tensor is temperature independent, while macroscopic magnetic axes continue to rotate. Additionally, the susceptibility anisotropy has a temperature dependence which cannot be reconciled with the isotropic Heisenberg model of interactions between spins. ESR linewidth analysis shows that anisotropic exchange interaction must be present in SeCuO 3 . These findings strongly support the presence of anisotropic exchange interactions in the Hamiltonian of the studied system. Below T N = 8 K, the system enters a long -range antiferromagnetically ordered state with easy axis along the <101 > * direction. Small but significant rotation of magnetic axes is also observed in the antiferromagnetically ordered state suggesting strong spin-lattice coupling in this system.

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