High resolution magnetostriction measurements in pulsed magnetic fields using fiber Bragg gratings

Daou, Ramzy; Weickert, Franziska; Nicklas, M.; Steglich, F.; Haase, A.; Doerr, M.

doi:10.1063/1.3356980

Cited by 77 publications

(72 citation statements)

References 9 publications

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“…were measured using a fiber Bragg grating (FBG) technique [32,33] consisting of recording spectral information of the light reflected by a 0.5-mm-long Bragg grating inscribed in the core of a 125 µm telecom optical fiber. The FBG section of the fiber is attached to the sample to be studied, and changes in the grating spacing are driven by changes in the sample dimensions when the temperature or magnetic field is changed.…”

Section: Methodsmentioning

confidence: 99%

Quasi-two-dimensional Bose-Einstein condensation of spin triplets in the dimerized quantum magnetBa2CuSi2O6Cl2

et al. 2016

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We synthesized single crystals of composition Ba2CuSi2O6Cl2 and investigated its quantum magnetic properties. The crystal structure is closely related to that of the quasi-two-dimensional (2D) dimerized magnet BaCuSi2O6 also known as Han purple. Ba2CuSi2O6Cl2 has a singlet ground state with an excitation gap of ∆/kB = 20.8 K. The magnetization curves for two different field directions almost perfectly coincide when normalized by the g-factor except for a small jump anomaly for a magnetic field perpendicular to the c axis. The magnetization curve with a nonlinear slope above the critical field is in excellent agreement with exact-diagonalization calculations based on a 2D coupled spin-dimer model. Individual exchange constants are also evaluated using density functional theory (DFT). The DFT results demonstrate a 2D exchange network and weak frustration between interdimer exchange interactions, supported by weak spin-lattice coupling implied from our magnetostriction data. The magnetic-field-induced spin ordering in Ba2CuSi2O6Cl2 is described as the quasi-2D Bose-Einstein condensation of triplets.

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Section: Methodsmentioning

confidence: 99%

Quasi-two-dimensional Bose-Einstein condensation of spin triplets in the dimerized quantum magnetBa2CuSi2O6Cl2

et al. 2016

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“…• between the b and c axes at T = 4 K. 10 Previous work on GdSi [12][13][14] has shown that the antiferromagnetic order is robust up to approximately 20 Tesla at cryogenic temperatures. However, the H-T phase diagram is not complete, [12][13][14][15] and a detailed understanding of the spin structure is missing.…”

Section: Introductionmentioning

confidence: 99%

“…However, the H-T phase diagram is not complete, [12][13][14][15] and a detailed understanding of the spin structure is missing. Through a combination of the resistivity ρ(T , H ), magnetization M(T , H ), and synchrotron x-ray diffraction, we map out the full phase diagram and spin structures for magnetic fields applied along all three crystal (Fig.…”

Section: Introductionmentioning

confidence: 99%

Evolution of incommensurate spin order with magnetic field and temperature in the itinerant antiferromagnet GdSi

et al. 2013

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GdSi exhibits spin-density-wave (SDW) order arising from the cooperative interplay of sizeable local moments and a partially nested Fermi sea of itinerant electrons. Using magnetotransport, magnetization, and nonresonant magnetic x-ray diffraction techniques, we determine the H-T phase diagrams of GdSi for magnetic fields up to 21 T, where antiferromagnetic order is no longer stable, and field directions along each of the three major crystal axes. While the incommensurate magnetic ordering vector that characterizes the SDW is robust under magnetic field, the multiple spin structures of this compound are highly flexible and rotate relative to the applied field via either canting or spin-flop processes. The antiferromagnetic spin densities always arrange themselves transverse to the applied magnetic field direction. The phase diagrams are delineated by two types of phase boundaries: one separates a collinear from a planar spin structure associated with a lattice structural transition, and the other defines a spin flop transition that is only weakly temperature dependent. The major features of the phase diagrams along each of the crystal axes can be explained by the combination of local moment and global Fermi surface physics at play.

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“…To this end, Daou et al (12) recently developed a very sensitive, all-optical technique based on fiber Bragg gratings to measure magnetostriction (MS) in ultrahigh pulsed magnetic fields, thereby enabling strain measurements of materials that require high magnetic fields to overcome strong antiferromagnetic spin interactions. Here we combine five essential advances, used to reveal new magnetic textures in SrCu 2 ðBO 3 Þ 2 .…”

mentioning

confidence: 99%

Magnetostriction and magnetic texture to 100.75 Tesla in frustrated SrCu ₂ (BO ₃ ) ₂

Jaime

Daou

Crooker

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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132

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Strong geometrical frustration in magnets leads to exotic states such as spin liquids, spin supersolids, and complex magnetic textures. SrCu 2 ðBO 3 Þ 2 , a spin-1∕2 Heisenberg antiferromagnet in the archetypical Shastry-Sutherland lattice, exhibits a rich spectrum of magnetization plateaus and stripe-like magnetic textures in applied fields. The structure of these plateaus is still highly controversial due to the intrinsic complexity associated with frustration and competing length scales. We discover magnetic textures in SrCu 2 ðBO 3 Þ 2 via magnetostriction and magnetocaloric measurements in fields up to 100.75 T. In addition to observing low-field fine structure with unprecedented resolution, the data also reveal lattice responses at 73.6 Tand at 82 T that we attribute, using a controlled density matrix renormalization group approach, to a unanticipated 2∕5 plateau and to the long-predicted 1∕2 plateau.high magnetic fields | quantum magnet | field-induced magnetic texturing | density matrix renormalization group | magnetocaloric effect Q uantum paramagnets are Mott insulators where dominant intracell antiferromagnetic interactions lead to a singlet ground state that remains stable for small intercell interactions. The low energy spectrum of triplet excitations is gapped. For systems with uniaxial symmetry, the gap (Δ) is closed by applying a magnetic field gμ 0 H 0 ≈ Δ along the symmetry c-axis (see Fig. 1 A and B). The low-energy degrees of freedom can be mapped onto a gas of hard-core bosons (1). In this description, the external magnetic field plays the role of a chemical potential, and the longitudinal magnetization corresponds to the boson concentration. In systems such as BaCuSi 4 O 6 (2), where Cu atoms are arranged in parallel dimers on a square lattice, the triplets condense in a phase-coherent fluid analogous to a Bose-Einstein condensate. On the other hand, if the kinetic energy is highly frustrated, the repulsion between triplets becomes dominant and leads to crystals with superstructures that are highly sensitive to the concentration of triplets or magnetization (3). These crystalline states correspond to Ising-like orderings-i.e., states with spontaneous modulation of the spin component parallel to the field. The orthogonal-dimer geometry of the Shastry-Sutherland lattice (Fig. 1A) (4) and the ratio of next-nearest to nearest neighbor exchange interactions between the spin-1∕2 Cu 2þ ions, with J 1 ∕J 0 at approximately 0.62 (J 0 ≈ 74 K), make SrCu 2 ðBO 3 Þ 2 a paradigm of frustrated quantum magnetism (5-8). Nuclear magnetic resonance (9) and torque magnetometry (10, 11) measurements have been used in the past to study the magnetic superstructures in SrCu 2 ðBO 3 Þ 2 , but the strength of required magnetic fields has prevented the unambiguous observation of magnetization fractions beyond 1∕3 of saturation. Sensitive measurements for higher concentrations are crucial for model validation. Indeed, given the limited lattice sizes for which the minimal model for SrCu 2 ðBO 3 Þ 2 can be solved under...

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High resolution magnetostriction measurements in pulsed magnetic fields using fiber Bragg gratings

Cited by 77 publications

References 9 publications

Quasi-two-dimensional Bose-Einstein condensation of spin triplets in the dimerized quantum magnetBa2CuSi2O6Cl2

Quasi-two-dimensional Bose-Einstein condensation of spin triplets in the dimerized quantum magnetBa2CuSi2O6Cl2

Evolution of incommensurate spin order with magnetic field and temperature in the itinerant antiferromagnet GdSi

Magnetostriction and magnetic texture to 100.75 Tesla in frustrated SrCu ₂ (BO ₃ ) ₂

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High resolution magnetostriction measurements in pulsed magnetic fields using fiber Bragg gratings

Cited by 77 publications

References 9 publications

Quasi-two-dimensional Bose-Einstein condensation of spin triplets in the dimerized quantum magnetBa2CuSi2O6Cl2

Quasi-two-dimensional Bose-Einstein condensation of spin triplets in the dimerized quantum magnetBa2CuSi2O6Cl2

Evolution of incommensurate spin order with magnetic field and temperature in the itinerant antiferromagnet GdSi

Magnetostriction and magnetic texture to 100.75 Tesla in frustrated SrCu 2 (BO 3 ) 2

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Magnetostriction and magnetic texture to 100.75 Tesla in frustrated SrCu ₂ (BO ₃ ) ₂