Origin of modulated phases and magnetic hysteresis in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>TmB</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>

Wierschem, Keola; Sunku, Sai; Kong, Tai; Ito, T.; Canfield, Paul C.; Panagopoulos, C.; Sengupta, Pinaki

doi:10.1103/physrevb.92.214433

Cited by 24 publications

(32 citation statements)

References 28 publications

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“…2(d). We denote the additional intermediate phase 1/q, as the value of M in this region has been reported to be history dependent (q may take a value of 7, 9, or 11 [16]) and may not be precisely quantized [26]. Interestingly, this higher degree of complexity is also reflected qualitatively in ρ xx (B).…”

Section: Methodsmentioning

confidence: 99%

“…5(c), with AFM domains in an antiphase periodic structure. It has been suggested that the alignment/shift of those AFM domains every 4/5 unit cells leads to the (1/q)M s phase in TmB 4 [26]. This characteristic of training and complexity is a hallmark of strong magnetic frustration in TmB 4 ; the resulting increase in ρ xx can then be viewed as being due to domain wall scattering or the opening of superzone gaps in the Fermi surface if such structures are macroscopically ordered.…”

Section: Transport In Tmbmentioning

confidence: 99%

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Electronic transport on the Shastry-Sutherland lattice in Ising-type rare-earth tetraborides

Suzuki

Checkelsky

2017

Phys. Rev. B

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In the presence of a magnetic field frustrated spin systems may exhibit plateaus at fractional values of saturation magnetization. Such plateau states are stabilized by classical and quantum mechanisms including order by disorder, triplon crystallization, and various competing order effects. In the case of electrically conducting systems, free electrons represent an incisive probe for the plateau states. Here we study the electrical transport of Ising-type rare-earth tetraborides RB 4 (R = Er, Tm), a metallic Shastry-Sutherland lattice showing magnetization plateaus. We find that the longitudinal and transverse resistivities reflect scattering with both the static and the dynamic plateau structure. We model these results consistently with the expected strong uniaxial anisotropy on a quantitative level, providing a framework for the study of plateau states in metallic frustrated systems.

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Section: Methodsmentioning

confidence: 99%

Section: Transport In Tmbmentioning

confidence: 99%

Electronic transport on the Shastry-Sutherland lattice in Ising-type rare-earth tetraborides

Suzuki

Checkelsky

2017

Phys. Rev. B

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“…Below T N 2 = 9.7K, an antiferromagnetic Néel phase is stable and the magnetization shows a striking field dependence: a wide half plateau is present at M/M sat = 1/2 (M sat is the saturation magne- 4 as determined from our data [12]. tization of 7µ B /Tm) and a narrow hysteretic fractional plateau at M/M sat ∼ 1/8 [14,15,18]. Between T N 1 = 11.7K and T N 2 , neutron scattering experiments find two long-range-modulated phases, MP1 and MP2 [16].…”

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confidence: 99%

“…Quantum Design (QD) MPMS XL SQUID magnetometer was used for DC magnetization measurements and QD PPMS for transport experiments [12]. Since the magnetization in the fractional plateau phase is known to vary with field history [14,18], a protocol was developed that reproduces the same magnetization curve at 2K when the measurement is repeated [12].…”

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confidence: 99%

Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnetTmB4

et al. 2016

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We study TmB 4 , a frustrated magnet on the Archimedean Shastry-Sutherland lattice, through magnetization and transport experiments. The lack of anisotropy in resistivity shows that TmB 4 is an electronically three-dimensional system. The magnetoresistance (MR) is hysteretic at lowtemperature even though a corresponding hysteresis in magnetization is absent. The Hall resistivity shows unconventional anomalous Hall effect (AHE) and is linear above saturation despite a large MR. We propose that complex structures at magnetic domain walls may be responsible for the hysteretic MR and may also lead to the AHE.Geometric frustration in magnetic systems arises from competing magnetic interactions that cannot be satisfied simultaneously and leads to a variety of exotic ground states [1]. While insulating frustrated materials are well studied, metallic systems have received less attention [2]. In metallic materials, the conduction electrons mediate interactions between the magnetic moments. Additionally, the transport properties in such systems can be strongly influenced by the magnetic structure [1]. This interplay between magnetism and charge can be exploited in two ways: to engineer a highly field tunable response of the transport properties [3] or to use transport experiments as an indirect probe of the complex magnetic structures that arise in such systems [4,5].The rare earth tetraboride family (RB 4 , R is a rare earth) is a series of metallic frustrated magnets. RB 4 crystallizes in a tetragonal structure (space group P4/mbm, 127) [6], consisting of alternating layers of R and B ions (Fig 1(a)). The R ions form a frustrated Shastry-Sutherland lattice (SSL) with competing interactions J 1 and J 2 [7]. Quite remarkably, high resolution structural refinement of LaB 4 [8] and HoB 4 [9] show that the R-R bonds corresponding to J 1 and J 2 are equal in length, making the R-sublattice a rare physical realization of one of the eleven Archimedean lattices [10] (Fig. 1(b)). While other frustrated Archimedean lattices such as the triangular and Kagomé lattices are well studied [10,11], the RB 4 family is the only known realization of the Archimedean Shastry-Sutherland lattice.In this article, we use magnetization and transport experiments to study TmB 4 , a member of the RB 4 family that has attracted attention for its rich phase diagram [13][14][15][16] (Fig. 1(c)). Crystal field effects at the Tm

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“…This is not simply of academic interest. There exists a complete family of rare earth tetraborides, RB 4 , (R=Tm, Er, Tb, Dy, Ho) where there is a strong coupling between the itinerant electrons arising (predominantly) from the unfilled 5d orbitals of the R 3+ ions and localized moments due to unfilled 4f orbitals of the same [33,34,35,36,37,38,39]. The R 3+ ions in these magnets are arranged in an SSL geometry, making the ShastrySutherland Kondo Lattice Model (SS-KLM) the ideal framework to understand the magnetic and electronic properties of this family of metallic quantum magnets [40].…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of the Shastry-Sutherland Kondo lattice model with classical localized spins: a variational calculation study

Shahzad

Sengupta

2017

J. Phys.: Condens. Matter

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Abstract. We study the Shastry-Sutherland Kondo lattice model with additional Dzyaloshinskii-Moriya (DM) interactions, exploring the possible magnetic phases in its multi-dimensional parameter space. Treating the local moments as classical spins and using a variational ansatz, we identify the parameter ranges over which various common magnetic orderings are potentially stabilized. Our results reveal that the competing interactions result in a heightened susceptibility towards a wide range of spin configurations including longitudinal ferromagnetic and antiferromagnetic order, coplanar flux configurations and most interestingly, multiple non-coplanar configurations including a novel canted-Flux state as the different Hamiltonian parameters like electron density, interaction strengths and degree of frustration are varied. The non-coplanar and non-collinear magnetic ordering of localized spins behave like emergent electromagnetic fields and drive unusual transport and electronic phenomena.

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Origin of modulated phases and magnetic hysteresis inTmB4

Cited by 24 publications

References 28 publications

Electronic transport on the Shastry-Sutherland lattice in Ising-type rare-earth tetraborides

Electronic transport on the Shastry-Sutherland lattice in Ising-type rare-earth tetraborides

Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnetTmB4

Phase diagram of the Shastry-Sutherland Kondo lattice model with classical localized spins: a variational calculation study

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