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Usevičius, Gediminas; Turčak, Justinas; Zhang, Yuxuan; Eggeling, Andrea; Einorytė, Žyginta; Hope, Michael Allan; Svirskas, Šarūnas; Klose, Daniel; Kalendra, Vidmantas; Aidas, Kestutis; Jeschke, Gunnar; Banys, Jūras; Šimėnas, Mantas
Dalton transactions : an international journal of inorganic chemistry, 2024-Apr-30, 2024-04-30, Letnik: 53, Številka: 17Journal Article
Hybrid methylammonium (MA) lead halide perovskites have emerged as materials exhibiting excellent photovoltaic performance related to their rich structural and dynamic properties. Here, we use multifrequency (X-, Q-, and W-band) electron paramagnetic resonance (EPR) spectroscopy of Mn impurities in MAPbCl to probe the structural and dynamic properties of both the organic and inorganic sublattices of this compound. The temperature dependent continuous-wave (CW) EPR experiments reveal a sudden change of the Mn spin Hamiltonian parameters at the phase transition to the ordered orthorhombic phase indicating its first-order character and significant slowing down of the MA cation reorientation. Pulsed EPR experiments are employed to measure the temperature dependences of the spin-lattice relaxation and decoherence times of the Mn ions in the orthorhombic phase of MAPbCl revealing a coupling between the spin center and vibrations of the inorganic framework. Low-temperature electron spin echo envelope modulation (ESEEM) experiments of the protonated and deuterated MAPbCl analogues show the presence of quantum rotational tunneling of the ammonium groups, allowing to accurately probe their rotational energy landscape.
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