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Titolo:
Spin-lattice relaxation of Co(II) in hexaaquocobalt(II) picrylsulphonate tetrahydrate: An estimate from EPR line width of the dopant, Mn(II)
Autore:
Anthonisamy, VSX; Velayutham, M; Murugesan, R;
Indirizzi:
Madurai Kamaraj Univ, Sch Chem, Dept Chem Phys, Madurai 625021, Tamil Nadu, Madurai Kamaraj Univ Madurai Tamil Nadu India 625021 625021, Tamil Nadu, Indianilnst Technol, Reg Sophisticated Instrumentat Ctr, Madras 600036, Tam Indian Inst Technol Madras Tamil Nadu India 600036 tr, Madras 600036, Tam
Titolo Testata:
PHYSICA B
fascicolo: 1-2, volume: 262, anno: 1999,
pagine: 13 - 19
SICI:
0921-4526(199902)262:1-2<13:SROCIH>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-PARAMAGNETIC-RES; SINGLE-CRYSTALS; TUTTON SALT; TEMPERATURE-VARIATION; PHASE-TRANSITION; CO-2+ IONS; MN-2+; RESONANCE; TIME; LINEWIDTHS;
Keywords:
Mn2+; EPR; Co2+; spin-lattice relaxation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Murugesan, R Amer Coll, Dept Chem, Madurai 625002, Tamil Nadu, India Amer Coll Madurai Tamil Nadu India 625002 Tamil Nadu, India
Citazione:
V.S.X. Anthonisamy et al., "Spin-lattice relaxation of Co(II) in hexaaquocobalt(II) picrylsulphonate tetrahydrate: An estimate from EPR line width of the dopant, Mn(II)", PHYSICA B, 262(1-2), 1999, pp. 13-19

Abstract

Single crystal EPR of Mn(II)-doped [Co(H2O)(6)] (picsul)(2) . 4H(2)O is studied in the temperature range of 123-300 K. The angular variation of the zero-field transitions, observed from a single magnetically distinct site, is successfully simulated with an asymmetric zero-held tensor with D = 436 x10(-4) cm(-1) and E = 79 x 10(-4) cm(-1). Sharp EPR spectra observed for Mn(II), a paramagnetic dopant in the paramagnetic host lattice, are attributed to host-spin-lattice relaxation narrowing. Based on the theory of exchange narrowing of dipolar coupling, the T-1 of Co(II) has been estimated to be 0.54 x 10(-12) s at 300 K. From the temperature dependence of T-1, it is postulated that two-phonon Raman process is the dominant mechanism for spin-lattice relaxation above 250 K, and below 250 K a cross-relaxation processis evident. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 27/10/20 alle ore 05:31:43