Freezing of molecular rotation in a paramagnetic crystal studied by 
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 NMR

Opherden, D.; Bartl, Franz; Yamamoto, Shingo; Zhang, Zhitao; Luther, S.; Molatta, S.; Wosnitza, J.; Baenitz, M.; Heinmaa, Ivo; Stern, Raivo; Landee, Christopher P.; Kühne, H.

doi:10.1103/physrevb.103.014428

Cited by 4 publications

(4 citation statements)

References 37 publications

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“…As the temperature increases to 360 K, the full width at half-maximum (FWHM) of the 31 P NMR signals slightly decreases (Figure c), which indicates the acceleration of the rolling rate of the PF 6 anions in the LTP. However, FWHM drops sharply at around 380 K, suggesting that the pure Lorentzian line shape was altered by the fluctuating field from the electric dipolar moment of radicals due to the phase transition, according to the previous report . As a consequence, the rolling rate of PF 6 – anions in the HTP is much higher than that in the LTP.…”

Section: Resultssupporting

confidence: 57%

“…However, FWHM drops sharply at around 380 K, suggesting that the pure Lorentzian line shape was altered by the fluctuating field from the electric dipolar moment of radicals due to the phase transition, according to the previous report. 42 As a consequence, the rolling rate of PF 6 − anions in the HTP is much higher than that in the LTP. This result is also consistent with the disordered and ordered crystal structures in the HTP and LTP, respectively.…”

Section: Free Radical Compound [(Nh 3 -Tempo)(18-crown-6)][asf 6 ]mentioning

confidence: 99%

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Bistable Optoelectronic Properties Originated from the Scissoring Motion of the TEMPO Skeleton in Supramolecular Radical Ferroelectrics

Xie

Chen

et al. 2023

Inorg. Chem.

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Bistable materials with multiphysical channels, such as optical, electrical, and magnetic properties, have been paid dramatic attention due to their alternativity of the signal status in electronic devices. Herein, three stable supramolecular radicals ([(NH3-TEMPO)(18-crown-6)][XF6] (1, X = P; 2, X = As; 3, X = Sb)) were synthesized and characterized. The former two molecules present ferroelectric phase transitions around 381.7 and 382.7 K, respectively, with bistability in dielectric property and second-harmonic generation (SHG) effect, which are first found in supramolecular radicals. Their ferroelectric transition and bistable properties are generated from a net polar crystal structure owing to the static ordered packing of NH3-TEMPO radical cations in the low-temperature phase (LTP) to a nonpolar structure owing to a distinctive symmetric scissoring motion of NH3-TEMPO radical cations between two 18-crown-6 molecules in the high-temperature phase (HTP). Both of them exhibit paramagnetic properties in HTP and LTP states since no intermolecular spin–spin interaction occurs due to the long distances among the radicals in their crystals. These results make us possible to design bistable optoelectronic radical materials with bistability in magnetic property in the future.

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Section: Resultssupporting

confidence: 57%

Section: Free Radical Compound [(Nh 3 -Tempo)(18-crown-6)][asf 6 ]mentioning

confidence: 99%

Bistable Optoelectronic Properties Originated from the Scissoring Motion of the TEMPO Skeleton in Supramolecular Radical Ferroelectrics

Xie

Chen

et al. 2023

Inorg. Chem.

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“…As previously reported, the 31 P 1=T 1 rate in CuPOF yields several broad maxima at high temperatures, which are associated with a freezing of the PF 6 molecular reorientation modes [39]. Below about 10 K, in the range of interest in the present study, these modes are frozen out and 1=T 1 becomes temperature independent, indicating predominantly paramagnetic fluctuations.…”

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confidence: 81%

Field-Tunable Berezinskii-Kosterlitz-Thouless Correlations in a Heisenberg Magnet

Opherden

Bartl

et al. 2023

Phys. Rev. Lett.

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“…[ 34 ] Towards further cooling, it increases to reach a maximum and falls down again, forming a well‐defined peak at ≈20 K. This low‐temperature peak is naturally reminiscent of the glassy spin freezing behavior. [ 35,36 ] In the BPP description, the occurrence of a peak in 1/ T 1 T reflects a progressive slowing down of the spin fluctuations, and the peak temperature is defined as spin freezing temperature T sf on the timescale of NMR. [ 37 ] The enhancement of 1/ T 1 T from ≈50 K is therefore ascribed to the low‐energy spin fluctuations.…”

Section: Resultsmentioning

confidence: 99%

Giant Negative Magnetoresistance beyond Chiral Anomaly in Topological Material YCuAs₂

et al. 2022

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The large negative magnetoresistance (MR) effect, which usually emerges in various magnetic systems, is a technologically important property for spintronics. Recently, the so‐called “chiral anomaly” in topological semimetals offers an alternative to generate a considerable negative MR effect without utilizing magnetism. However, it requires that the applied magnetic field must be strictly along the electric current direction, which sets a strong limit for practical applications. Here, a giant negative MR effect is discovered with a value of up to −40% in 9 T at 2 K in the nonmagnetic Dirac material YCuAs2, which is not restricted to the specific configuration for applied magnetic fields. Based on magnetic susceptibility and NMR measurements, the giant negative MR effect is tightly connected with the unexpected spin‐dependent scattering from vacancy‐induced local moments, which is also beyond the classical Kondo effect. The present work not only offers an alternative route for spintronics based on nonmagnetic topological materials, but also helps to further understand the negative MR effect in topological materials.

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Freezing of molecular rotation in a paramagnetic crystal studied by P31 NMR

Cited by 4 publications

References 37 publications

Bistable Optoelectronic Properties Originated from the Scissoring Motion of the TEMPO Skeleton in Supramolecular Radical Ferroelectrics

Bistable Optoelectronic Properties Originated from the Scissoring Motion of the TEMPO Skeleton in Supramolecular Radical Ferroelectrics

Field-Tunable Berezinskii-Kosterlitz-Thouless Correlations in a Heisenberg Magnet

Giant Negative Magnetoresistance beyond Chiral Anomaly in Topological Material YCuAs₂

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Freezing of molecular rotation in a paramagnetic crystal studied by P31 NMR

Cited by 4 publications

References 37 publications

Bistable Optoelectronic Properties Originated from the Scissoring Motion of the TEMPO Skeleton in Supramolecular Radical Ferroelectrics

Bistable Optoelectronic Properties Originated from the Scissoring Motion of the TEMPO Skeleton in Supramolecular Radical Ferroelectrics

Field-Tunable Berezinskii-Kosterlitz-Thouless Correlations in a Heisenberg Magnet

Giant Negative Magnetoresistance beyond Chiral Anomaly in Topological Material YCuAs2

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Product

Resources

About

Giant Negative Magnetoresistance beyond Chiral Anomaly in Topological Material YCuAs₂