New high homogeneity 55 T pulsed magnet for high field NMR

Orlova, Anna; Frings, P.; Suleiman, M.; Rikken, G. L. J. A.

doi:10.1016/j.jmr.2016.04.016

Cited by 11 publications

(5 citation statements)

References 23 publications

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“…As in the previous high-field study [27], the 51 V (nuclear spin I = 7/2) nuclei at the non-magnetic sites were used as a probe of the local magnetic properties of the Cu 2+ moments. The method and the experimental set-up for the NMR measurements in pulsed magnetic field have been discussed elsewhere [30][31][32]. Transient pulsed magnetic fields up to 55 T with 70 ms rise time, generated by a new homogeneous pulsed-field magnet [31], were applied parallel to the c and b axes of the crystal.…”

mentioning

confidence: 99%

“…The method and the experimental set-up for the NMR measurements in pulsed magnetic field have been discussed elsewhere [30][31][32]. Transient pulsed magnetic fields up to 55 T with 70 ms rise time, generated by a new homogeneous pulsed-field magnet [31], were applied parallel to the c and b axes of the crystal. At the desired value of the pulsed external field, H, the NMR signal was recorded during a short time slot, with echo-pulse sequences consisting of two 0.5 µs excitation pulses separated by 15 µs.…”

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confidence: 99%

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Nuclear Magnetic Resonance Signature of the Spin-Nematic Phase in LiCuVO4 at High Magnetic Fields

et al. 2017

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We report a 51 V nuclear magnetic resonance investigation of the frustrated spin-1/2 chain compound LiCuVO4, performed in pulsed magnetic fields and focused on high-field phases up to 55 T. For the crystal orientations H c and H b we find a narrow field region just below the magnetic saturation where the local magnetization remains uniform and homogeneous, while its value is field dependent. This behavior is the first microscopic signature of the spin-nematic state, breaking spin-rotation symmetry without generating any transverse dipolar order, and is consistent with theoretical predictions for the LiCuVO4 compound.PACS numbers: 75.10. Kt, 75.30.Kz, The search for new states of quantum matter is one of the most active research fields in condensed-matter physics. In this respect frustrated magnetic systems attract a lot of interest as they accommodate various unconventional quantum states, having no direct classical analogues, ordered and disordered, induced by the competing interactions [1]. One particularly interesting state is the spin-nematic phase, in which the quantum magnet behaves like a liquid crystal. Taking an external magnetic field H as the reference direction, a spin-nematic phase is defined as a state without any transverse dipolar (i.e., vector-type) order, (−1) i S + i + H.c. = 0, but possessing instead a transverse quadrupolar (tensor-type) order,The quadrupolar order parameter develops on the bonds between neighboring spins and can be described as a condensate of two-magnon pairs. It breaks the spin-rotational symmetry about the magnetic field, but only partially as π-rotations transform the order parameter into itself. The also broken translational symmetry of the order parameter is invisible in the dipolar channel. There is also an analogy between the spin-nematic phase and the superconducting state: the nematic phase can be considered as a "bosonic" superconductor formed as a result of two-magnon condensation [1,2].The concept of a spin-nematic state was developed by Andreev and Grishchuk more than 30 years ago [3], which incited intense search for a realization in real materials. However, a definite experimental proof for the existence of such a phase has not been provided yet. Several magnetic insulators have been proposed as possible candidates, including the two-dimensional magnet NiGa 2 S 4 (spin-1 system) [4-6] and thin films of 3 He [7][8][9].In the past 10 years a large number of theoretical studies have supported the formation of the spinnematic phase in frustrated zig-zag 1D (chain) systems [10][11][12][13][14]. Amongst these, orthorhombic LiCuVO 4 is one of the most promising candidates [15,16]. It consists of spin-1/2 Cu 2+ chains along the orthorhombic b axis with a dominant nearest-neighbor ferromagnetic interaction J 1 = −1.6 meV, a frustrated next-nearest-neighbor antiferromagnetic interaction J 2 = 3.8 meV, and an interchain coupling J = −0.4 meV [17,18]. At zero magnetic field an incommensurate planar spiral structure is realized below T N = 2.3 K, having the moments lying...

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Nuclear Magnetic Resonance Signature of the Spin-Nematic Phase in LiCuVO4 at High Magnetic Fields

et al. 2017

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“…The practical limit using currently known low-temperature superconductor technology appears to be on the order of 1 GHz proton Larmor frequency [204,205]. The impetus to increase sensitivity and resolution continues to drive the production of NMR magnets with even higher field, using a variety of different approaches, including high-temperature superconductors [206,207,208], powered resistive magnets used in either continuous field [209,210] or pulsed [211,212,213] mode, and resistive/superconducting series-connected hybrid magnets [56].…”

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confidence: 99%

Advances in instrumentation and methodology for solid-state NMR of biological assemblies

Martin

Kelly

Kelz

2019

Journal of Structural Biology

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Many advances in instrumentation and methodology have furthered the use of solid-state NMR as a technique for determining the structures and studying the dynamics of molecules involved in complex biological assemblies. Solid-state NMR does not require large crystals, has no inherent size limit, and with appropriate isotopic labeling schemes, supports solving one component of a complex assembly at a time. It is complementary to cryo-EM, in that it provides local, atomic-level detail that can be modeled into larger-scale structures. This review focuses on the development of high-field MAS instrumentation and methodology; including probe design, benchmarking strategies, labeling schemes, and experiments that enable the use of quadrupolar nuclei in biomolecular NMR. Current challenges facing solid-state NMR of biological assemblies and new directions in this dynamic research area are also discussed.

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“…As in the previous high-field study [27], the 51 V (nuclear spin I ¼ 7=2) nuclei at the nonmagnetic sites were used as a probe of the local magnetic properties of the Cu 2þ moments. The method and the experimental setup for the NMR measurements in pulsed magnetic field have been discussed elsewhere [30][31][32]. Transient pulsed magnetic fields up to 55 T with 70 ms rise time, generated by a new homogeneous pulsedfield magnet [31], were applied parallel to the c and b axes of the crystal.…”

mentioning

confidence: 99%

“…The method and the experimental setup for the NMR measurements in pulsed magnetic field have been discussed elsewhere [30][31][32]. Transient pulsed magnetic fields up to 55 T with 70 ms rise time, generated by a new homogeneous pulsedfield magnet [31], were applied parallel to the c and b axes of the crystal. At the desired value of the pulsed external field H, the NMR signal was recorded during a short time slot, with echo-pulse sequences consisting of two 0.5 μs excitation pulses separated by 20 μs.…”

mentioning

confidence: 99%

Closing in on a Magnetic Analog of Liquid Crystals

Frederic

2017

Physics

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We report a 51 V nuclear magnetic resonance investigation of the frustrated spin-1=2 chain compound LiCuVO 4 , performed in pulsed magnetic fields and focused on high-field phases up to 56 T. For the crystal orientations H∥c and H∥b, we find a narrow field region just below the magnetic saturation where the local magnetization remains uniform and homogeneous, while its value is field dependent. This behavior is the first microscopic signature of the spin-nematic state, breaking spin-rotation symmetry without generating any transverse dipolar order, and is consistent with theoretical predictions for the LiCuVO 4 compound. DOI: 10.1103/PhysRevLett.118.247201 The search for new states of quantum matter is one of the most active research fields in condensed-matter physics. In this respect, frustrated magnetic systems attract a lot of interest as they accommodate various unconventional quantum states, having no direct classical analogues, ordered and disordered, induced by the competing interactions [1]. One particularly interesting state is the spinnematic phase, in which the quantum magnet behaves like a liquid crystal. Taking an external magnetic field H as the reference direction, a spin-nematic phase is defined as a state without any transverse dipolar (i.e., vector-type) order,The quadrupolar order parameter develops on the bonds between neighboring spins and can be described as a condensate of two-magnon pairs. It breaks the spinrotational symmetry about the magnetic field, but only partially as π rotations transform the order parameter into itself. The also broken translational symmetry of the order parameter is invisible in the dipolar channel. There is also an analogy between the spin-nematic phase and the superconducting state: the nematic phase can be considered as a "bosonic" superconductor formed as a result of twomagnon condensation [1,2].The concept of a spin-nematic state was developed by Andreev and Grishchuk more than 30 years ago [3], which incited an intense search for a realization in real materials. However, a definite experimental proof for the existence of such a phase has not been provided yet. Several magnetic insulators have been proposed as possible candidates, including the two-dimensional magnet NiGa 2 S 4 (spin-1 system) [4-6] and thin films of 3 He [7][8][9].In the past 10 years a large number of theoretical studies have supported the formation of the spin-nematic phase in frustrated zigzag 1D (chain) systems [10][11][12][13][14]. Among these, orthorhombic LiCuVO 4 is one of the most promising candidates [15,16]. It consists of spin-1=2 Cu 2þ chains along the orthorhombic b axis with a dominant nearestneighbor ferromagnetic interaction J 1 ¼ −1.6 meV, a frustrated next-nearest-neighbor antiferromagnetic interaction J 2 ¼ 3.8 meV, and an interchain coupling J ¼ −0.4 meV [17,18]. At zero magnetic field an incommensurate planar spiral structure is realized below T N ¼ 2.3 K, having the moments lying in the ab plane [19,20]. Above 10 T, an incommensurate, collinear spin-density wave (S...

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New high homogeneity 55 T pulsed magnet for high field NMR

Cited by 11 publications

References 23 publications

Nuclear Magnetic Resonance Signature of the Spin-Nematic Phase in LiCuVO4 at High Magnetic Fields

Nuclear Magnetic Resonance Signature of the Spin-Nematic Phase in LiCuVO4 at High Magnetic Fields

Advances in instrumentation and methodology for solid-state NMR of biological assemblies

Closing in on a Magnetic Analog of Liquid Crystals

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