Electron spin-lattice relaxation in Mn2+-doped ferroelectric TSCC

Brunner, W.; Völkel, G.; Windsch, W.; Kurkin, I. N.; Shlenkin, V. I.

doi:10.1016/0038-1098(78)90758-5

Cited by 26 publications

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“…A small dip of T 1 –1 is observed at T c , which we verified by several measurements. Such a minimum of the longitudinal relaxation rate at the phase transition was measured for many other ferroelectric or related compounds such as rochelle salt, KH 3 (SeO 3 ) 2 , betaine phosphite, TSCC, triglycine sulfate (TGS), and lead titanate . Note that in our previous study of the Mn 2+ doped [CH 3 NH 2 NH 2 ][Zn(HCOO) 3 ] framework, we also observed indications of the same behavior .…”

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confidence: 80%

Pulse EPR and ENDOR Study of Manganese Doped [(CH₃)₂NH₂][Zn(HCOO)₃] Hybrid Perovskite Framework

et al. 2017

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We present a pulse electron paramagnetic resonance (EPR) and electron−nuclear double resonance (ENDOR) study of a manganese-doped [(CH 3 ) 2 NH 2 ][Zn(HCOO) 3 ] dense metal−organic framework which exhibits a structural phase transition at 163 K. The echo-detected field sweep Mn 2+ EPR spectrum of the lowtemperature phase is in a perfect agreement with the previous continuous-wave EPR results, while the spectrum of the disordered phase reveals a significant EPR transition-dependent relaxation. The 1 H ENDOR pattern indicates several protons in the vicinity of the Mn 2+ ion. The experimental ENDOR spectrum is successfully simulated using the proton hyperfine tensors calculated by the density functional theory. A multifrequency electron spin echo envelope modulation (ESEEM) spectroscopy shows a peculiar signal which is unaffected by the external magnetic field. The modulation depth of this signal starts to decrease above 40 K, coinciding with the temperature at which the methyl groups of the (CH 3 ) 2 NH 2 + cations start to rotate. We also relate the methyl group motion to the decrease of the phase memory time of the Mn 2+ ions. The temperature dependence of the longitudinal relaxation time indicates a coupling between the Mn 2+ electron spins and a hard optical phonon mode. This mode undergoes a damping at the phase transition point.

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Section: Resultssupporting

confidence: 80%

Pulse EPR and ENDOR Study of Manganese Doped [(CH₃)₂NH₂][Zn(HCOO)₃] Hybrid Perovskite Framework

et al. 2017

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Elektronenspinecho‐Untersuchungen der Spektraldiffusion bei Mn²⁺‐Zentren in Trissarkosinkalziumchlorid‐Einkristallen

et al. 1981

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l&c?l.e zurn 60. &burtatag g e w i d k t I n h a l t sii bersicht. Elektronenspinecho-Untersuchungen der Phasengedachtniszeit von Mn2+-Zentren in TSCC-Einkriillen zeigen, daB der Echoabfall durch Spektraldiffusion bestimmt wird. D e r zeitliche Abfall des primiiren Echos ist nicht exponentiell und von der Konzentration der Mnw-Zentren abhiingig. Die Umorientierung der nichtresonanten Mnw-Spins, die iiber Dipol-Dipol-Wechselwirkung die Spektraldiffusion der resonanten &*+-Spins verursachen, wird durch die Spin-Gitter-Relaxation bewirkt.Abstraat. Electron spin-echo investigations of the phase memory time on Mn2+ centres in TSCC single crystals show the echo decay to be dominated by the spectral diffusion. The decay of the primary echo is nonexponential and depends on the concentration of the Mn2+ centres. The reorientation of the nonresonant &*+ spins causing via dipole-dipole-interaction the spectral diffusion of the resonant Mn2+ spins is determined by the spin-lattice relaxation.

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The use of electron spin echo spectroscopy to study the ferroelectric phase transition in ammonium sulfate

Narayana

Kevan

1981

Phys. Stat. Sol. (a)

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Using the SO2 radical generated by y-irradiation as the paramagnetic probe electron spin echo modulation analysis techniques are used to study the phase transition in ammonium sulfate.A drastic reduction in the phase memory time T,, from 2.2 ps at room temperature t o 0.5 ps a t 77 K is observed. By analyzing the deuterium modulations in terms of a multishell model such a decrease in T, is attributed to a movement of the ammonium protons closer to the sulfate group in the low temperature phase.Unter Benutzung des durch y-Strahlen erzeugten SOT-Radikals als paramagnetische Sonde wird die Analysenmethode der Elektronen-Spin-Echo-Modulation benutzt, um den Phasenubergang in Ammoniumsulfat zu untersuchen. Ein drastischer Abfall der Phasenspeicherzeit T M von 2,2 p s bei Zimmertemperatur auf 0,5 ps bei 77 K wird beobachtet. Durch Analyse der Deuteriummodulationen mit einem Schalenmodell wird ein derartiger Abfall in T, einer Wanderung der Ammoniumprotonen naher zur Sulfatgruppe in der Tieftemperaturphase zugeschrieben.

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Electron spin-lattice relaxation in Mn2+-doped ferroelectric TSCC

Cited by 26 publications

References 3 publications

Pulse EPR and ENDOR Study of Manganese Doped [(CH₃)₂NH₂][Zn(HCOO)₃] Hybrid Perovskite Framework

Pulse EPR and ENDOR Study of Manganese Doped [(CH₃)₂NH₂][Zn(HCOO)₃] Hybrid Perovskite Framework

Elektronenspinecho‐Untersuchungen der Spektraldiffusion bei Mn²⁺‐Zentren in Trissarkosinkalziumchlorid‐Einkristallen

The use of electron spin echo spectroscopy to study the ferroelectric phase transition in ammonium sulfate

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Electron spin-lattice relaxation in Mn2+-doped ferroelectric TSCC

Cited by 26 publications

References 3 publications

Pulse EPR and ENDOR Study of Manganese Doped [(CH3)2NH2][Zn(HCOO)3] Hybrid Perovskite Framework

Pulse EPR and ENDOR Study of Manganese Doped [(CH3)2NH2][Zn(HCOO)3] Hybrid Perovskite Framework

Elektronenspinecho‐Untersuchungen der Spektraldiffusion bei Mn2+‐Zentren in Trissarkosinkalziumchlorid‐Einkristallen

The use of electron spin echo spectroscopy to study the ferroelectric phase transition in ammonium sulfate

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Pulse EPR and ENDOR Study of Manganese Doped [(CH₃)₂NH₂][Zn(HCOO)₃] Hybrid Perovskite Framework

Pulse EPR and ENDOR Study of Manganese Doped [(CH₃)₂NH₂][Zn(HCOO)₃] Hybrid Perovskite Framework

Elektronenspinecho‐Untersuchungen der Spektraldiffusion bei Mn²⁺‐Zentren in Trissarkosinkalziumchlorid‐Einkristallen