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1H and 195Pt NMR Study of the Parallel Two-Chain Compound Per2[Pt(mnt)2]
Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
UT Southwestern Medical Center, 5325 Harry Hines Blvd., NE 4.2, Dallas, TX 75390, USA
Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA
Department of Chemistry, IST/ITN, Technical University of Lisbon / CFMCUL, Estrada Nacional n° 10, Sacavém P-2686-953, Portugal
Present Address: Hochfeld-Magnetlabor Dresden, Dresden 01314, Germany.
* Author to whom correspondence should be addressed.
Received: 12 June 2012; in revised form: 23 July 2012 / Accepted: 23 July 2012 / Published: 16 August 2012
Abstract: 1H and 195Pt NMR are used to probe the spin ½ anion chain in the quasi-one-dimensional conductor Per2[Pt(mnt)2], which exhibits nearly simultaneous charge density wave (CDW) and spin-Peierls (SP) transitions at low temperatures (Tc ~ 8 K). Below Tc the [Pt(mnt)2] chain forms a spin-singlet state that is evident in 1H NMR spectra and spin relaxation (1/T1) rates; however minority unpaired Pt spins may remain in the SP ground state. With increasing magnetic field, the SP and CDW order parameters decrease in unison, indicating they are coupled up to a critical field Bc ~ 20 T. Above Bc, the spin singlet evolves into a spin-polarized configuration. The 195Pt NMR signals vanish as either Tc or Bc are approached from within the SP ground state, suggesting the hyperfine field of the Pt nucleus is significantly stronger than at the proton sites. Simulations yield a consistent picture of the angular, temperature, and magnetic field-dependent spectral features.
Keywords: organic conductor; spin-peierls transition; charge density wave; nuclear magnetic resonance; high magnetic fields
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Green, E.L.; Lumata, L.L.; Brooks, J.S.; Kuhns, P.; Reyes, A.; Brown, S.E.; Almeida, M. 1H and 195Pt NMR Study of the Parallel Two-Chain Compound Per2[Pt(mnt)2]. Crystals 2012, 2, 1116-1135.
Green EL, Lumata LL, Brooks JS, Kuhns P, Reyes A, Brown SE, Almeida M. 1H and 195Pt NMR Study of the Parallel Two-Chain Compound Per2[Pt(mnt)2]. Crystals. 2012; 2(3):1116-1135.
Green, Elizabeth L.; Lumata, Lloyd L.; Brooks, James S.; Kuhns, Phil; Reyes, Arneil; Brown, Stuart E.; Almeida, Manuel. 2012. "1H and 195Pt NMR Study of the Parallel Two-Chain Compound Per2[Pt(mnt)2]." Crystals 2, no. 3: 1116-1135.