Frustrated magnets in high magnetic fields—selected examples

Wosnitza, J.; Zvyagin, S. A.; Жерлицын, С.

doi:10.1088/0034-4885/79/7/074504

Cited by 18 publications

(14 citation statements)

References 104 publications

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“…Geometrically frustrated triangular lattice antiferromagnets (TLAF) have been widely studied in recent decades as they show an impressive variety of exotic magnetic states [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

Magnetoelastic coupling and the magnetization plateau in Ba3CoSb2O9

Zelenskiy

Quilliam

et al. 2019

Phys. Rev. B

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High-precision ultrasonic measurements are used to study magnetoelastic coupling as a function of the in-plane magnetic field orientation in the spin-1/2 triangular lattice antiferromagnet Ba 3 CoSb 2 O 9 . The relevance of this coupling in stabilizing the 1/3 magnetization plateau is explored. The analysis indicates that, while the magnetoelastic coupling in Ba 3 CoSb 2 O 9 is large in comparison to other triangular lattice antiferromagnets, the strength of this coupling is still too small to fully account for the magnetization plateau width in Ba 3 CoSb 2 O 9 . Spin fluctuations are therefore the dominant mechanism inducing and stabilizing the magnetization plateau. Our results also show that the amplitude of the spin fluctuations suddenly drop as the V-phase is induced at higher field.

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“…Geometrically frustrated triangular lattice antiferromagnets (TLAF) have been widely studied in recent decades as they show an impressive variety of exotic magnetic states [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

Magnetoelastic coupling and the magnetization plateau in Ba3CoSb2O9

Zelenskiy

Quilliam

et al. 2019

Phys. Rev. B

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“…Here we recap that frustrated magnets are systems where the localized spins are entangled in an incompatible way due to either multiple competing exchange interactions, or the underlaying lattice geometry or both. [12][13][14][15][16] Generally, frustration tends to suppress spin ordering and promotes a complex magnetic…”

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confidence: 99%

Emergent Magnetic State in (111)-Oriented Quasi-Two-Dimensional Spinel Oxides

et al. 2019

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We report on the emergent magnetic state of (111)-oriented CoCr 2 O 4 ultrathin films sandwiched by Al 2 O 3 in the quantum confined geometry. At the two-dimensional crossover, polarized neutron reflectometry reveals an anomalous enhancement of the total magnetization compared to the bulk value. Synchrotron x-ray magnetic circular dichroism (XMCD) demonstrates the appearance of long-range ferromagnetic ordering of spins on both Co and Cr sublattices. Brillouin function analyses further corroborates 1 arXiv:1905.12024v1 [cond-mat.str-el] 28 May 2019 that the observed phenomena are due to the strongly altered magnetic frustration, manifested by the onset of a Yafet-Kittel type ordering as the new ground state in the ultrathin limit, which is unattainable in the bulk. Keywords spinels, ultrathin films, emergent properties, magnetismThe quest to design, discover and manipulate new quantum states of matter has fostered tremendous research activity among condensed matter physicists. Recent progress in the fabrication of epitaxial thin films has empowered this effort with additional means and led to a plethora of interesting artificial multilayers and heterostructures grown with atomic level of precision. 1-4 Nowadays, to realize exotic physics linked to many-body phenomena the interest has shifted to tailoring the magnetic states in quasi two-dimensional (2D) limit. 5,6 On one hand, according to the Mermin-Wagner theorem, in an isotropic Heisenberg spin system of dimensionality D ≤2, enhanced thermal fluctuations prohibit the onset of a long-range (ferroor antiferro-) magnetic ordering at any finite temperature. 7 On the other hand, lowering the dimensionality brings about several new factors that can radically alter a quantum system including changes in band topology, ionic coordinations and covalency, crystal fields, exchange pathways, magnetic anisotropy, quantum confinement, and universality class. 2,[8][9][10][11] As a result, in the crossover to low dimensions the magnetic ground state of a material can be distinctly different from its three-dimensional (3D) counterpart thus opening an opportunity for emergent or hidden materials phases.In this context, it is interesting to ask whether we can "dial-in" dimensionality of a system from 3D to 2D in a controllable way, and what can happen to the quantum state when low dimensionality entwines with frustration? Here we recap that frustrated magnets are systems where the localized spins are entangled in an incompatible way due to either multiple competing exchange interactions, or the underlaying lattice geometry or both. [12][13][14][15][16] Generally, frustration tends to suppress spin ordering and promotes a complex magnetic

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“…z g t N J P N S a U T e g I e 5 Z K G q H 2 8 / m p U 3 J m l S E J Y 2 V L G j J X f 0 / k N N I 6 i w L b G V E z 1 s v e T P z P 6 6 U m v P Z z L p P U o G S L R W E q i I n J 7 G 8 y 5 A q Z E Z k l l C l u b y V s T B V l x q Z T s S F 4 y y + v k v Z perturbations brought about by the magnetic field. Indeed, novel field-induced phases such as magnetization plateau and even spin liquid have been reported in both geometrically frustrated magnets [38][39][40][41][42][43][44][45][46][47] and Kitaev spin models [49][50][51][52][53][54][55][56][57][58][59][60]. In our case, the extensive ground-state degeneracy of the classical Γ-model is lifted by field along the high-symmetry [111] direction.…”

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confidence: 75%

Honeycomb-lattice Gamma model in a magnetic field: hidden Néel order and spin-flop transition

Tian,

Fan,

Saha

et al. 2021

Preprint

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We show that a magnetic field in the high-symmetry direction lifts the macroscopic classical ground-state degeneracy of the honeycomb Γ model and induces a long-range magnetic order. While a simple spin-polarized state is stabilized for the ferromagnetic Γ-exchange, a periodic √ 3 × √ 3 magnetic order is selected by magnetic field for the antiferromagnetic interaction. We show that the complex spin structure of the tripled unit cell can be described by the magnetization vector and a Néel order parameter, similar to those for the spin-flop state of a bipartite antiferromagnet. Indeed, the transition from the low-field plaquette-ordered spin liquid to the field-induced magnetic order can be viewed as a generalized spin-flop transition. An accidental O(2) degeneracy associated with rotation symmetry of the Néel vector is broken by either quantum or thermal fluctuations, leaving a six-fold degenerate ground state. At high fields, the breaking of the ground-state Z6 symmetry is through two Berezinskii-Kosterlitz-Thouless transitions that enclose a critical XY phase.

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Frustrated magnets in high magnetic fields—selected examples

Cited by 18 publications

References 104 publications

Magnetoelastic coupling and the magnetization plateau in Ba3CoSb2O9

Magnetoelastic coupling and the magnetization plateau in Ba3CoSb2O9

Emergent Magnetic State in (111)-Oriented Quasi-Two-Dimensional Spinel Oxides

Honeycomb-lattice Gamma model in a magnetic field: hidden Néel order and spin-flop transition

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