Proton spin-lattice relaxation in deuterated diluted copper tutton salts |
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| Affiliation: | 1. TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, 21 Brundavan Colony, Narsingi, Hyderabad 500 075, India;2. Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India;1. Institute of Materials, Shanghai University, Shanghai 200444, China;2. Zhejiang Institute of Advanced Materials, Shanghai University, Jiashan 314100, China;3. School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;1. Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, Albert Einstein 48, 01510 Vitoria-Gasteiz, Spain;2. Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Escuela de Ingeniería, Plaza Torres Quevedo, 1, 48013 Bilbao, Spain;3. Ikerbasque, Basque Foundation for Science, Bilbao 348013, Spain;1. Univ. Grenoble Alpes, INAC, SCIB, F-38000 Grenoble, France;2. CEA, INAC, SCIB, F-38000 Grenoble, France;3. CNRS, SCIB, F-38000 Grenoble, France |
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| Abstract: | The spin-lattice relaxation time, T1I, of the protons in (Cu,Zn)Cs2(SO4)2·6(H,D)2O was measured. The sample was 94% deuterated and contained 0.5% Cu2+ ions. The T1I measurements were carried out at liquid helium temperatures and at fields in the region from 5–15 kOe. Under these conditions, T1I shows a strong dependence on the direction of H0 with respect to the crystal axes, in the magnetic K1–K3 plane. This angular dependence has been accurately determined close to the K1 and K3 axes, at 1.4K. Between the angular dependent behaviour of the proton relaxation time and the EPR spectrum of the Cu2+ ions exists a striking correlation: T1I exhibits sharp minima at angles where the frequency distance between the EPR lines is about equal to the proton resonance frequency.The observed temperature dependence in the liquid helium region is weak and can very well be described with a factor (1−P20)−1, where P0 denotes the electron polarization. The field dependence of T1I appears to be between H1.00 and H1.50. |
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