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Slichter, C.P. Chen, Men-Chee 2011-06-16T13:54:59Z 2011-06-16T13:54:59Z 10000-01-01 1982 We have used spin echoes to study the 93Nb NQR in 2H-NbSe2Fex. We measured (intensity)x(temperature), and T1P (spin-lattice relaxation parameter) and T2 (spin-spin relaxation time) as a function of temperature. Our data reveal dramatic difference between non-spin glass samples (x=O, 0.25%, 1% and 5%) and spin glass samples (x=8%, 10% and 12%). Defining the spin glass transition temperature Tg by the cusp of the susceptibility versus temperature curve, we find a well defined minima at T:Tg tn (intensity)x(temperature), T1P and T2 as a function of temperature. Deduction of a correlation time of Fe spins from T1P and T2 is complicated by the intensity changes which imply that 0ne observes different groups of nuclei at different temperatures. We propose a two-correlation-time model, which utilizes the anisotropy of the exchange interaction, to overcome this difficulty. All of our NQR results and the model calculation of the correlation times of Fe spins are best described by the phase transit ion picture of spin glasses. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-16T13:54:58Z No. of bitstreams: 1 1982_chen.pdf: 3766545 bytes, checksum: 921a58036a6adb82c3eef7656cc8a69b (MD5) Made available in DSpace on 2011-06-16T13:54:59Z (GMT). No. of bitstreams: 1 1982_chen.pdf: 3766545 bytes, checksum: 921a58036a6adb82c3eef7656cc8a69b (MD5) Previous issue date: 1982 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-16T13:54:59Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:13:01-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 92639 http://hdl.handle.net/2142/25415 en 1982 Men-Chee Chen zero field Nuclear magnetic resonance (NMR) spin glass spin glass transition temperature iron-doped 2H-niobium diselenide Zero field NMR study on a spin glass: Iron-doped 2H-niobium diselenide Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.