Tony T. Tran

NMR, magnetization, and heat capacity studies of the uniform spin- 12 chain compound Bi6V3O16Chakrabarty1, Heinmaa2, Verchenko3 et al. 2019Phys. Rev. B7210View full textAdd to dashboardCite

“…[16][17][18] Even more recently, a study on Cs 4 CuSb 2 Cl 12 reported J = 186(2) K and a superconductorlike phase transition taking place only at T sp = 0.70(1) K, resulting in a ratio of suppression represented by f = |J|/T sp = 270 (7). 19 KCuF 3 has a relatively large interchain coupling (J /J ≈ 0.01), yielding f = 390 K/39 K = 10; 12 Sr 2 CuO 3 , with a tiny interchain interaction (J /J ≈ 10 −5 ), gives f = 2200 K/5 K = 440. 13 For Bi 6 V 3 O 16 the lowest estimate would be f = 108 K/2 K ≈ 55, suggesting that the interchain exchange interactions here are very weak and/or frustrated.…”

“…A uniform half-integer spin chain with AFM interactions exhibits a gapless ground state. [9][10][11][12][13][14][15][16][17][18][19] In the case of an AFM alternating Heisenberg chain, the AFM exchange constants (J 1 and J 2 ) between the two nearest-neighbor spins are unequal (J 1 = J 2 ; J 1 , J 2 > 0), and they alternate from bond to bond along the chain with an alteration parameter α = J 2 /J 1 . In the case of an alternating chain, interactions for half-integer spins result in the opening of a gap via either frustration due to the next-nearestneighbor AFM exchange or dimerization due to the alternating coupling to nearest neighbors along the chain.…”

Synthesis of bis(trithio)phosphines by oxidative transfer of phosphorus(i)

“…The C-C bond lengths within the carbocycles of the molecule range from 1.378(4)-1.411(4) Å and are consistent with the presence of an aromatic system, rather than a more diene-like system (which would suggest non-innocent behavior of the ligand). The heterocyclic ring in 1 is non-planar with a slight envelope effect observed such that the C6S2 and S2P mean planes form a fold angle of 31.1 o , similar to that observed in the parent derivative, (C6H4S2P)2 (33.03 o ) 44.…”

“…Previous studies indicate this diphosphine undergoes facile oxidation with even milder oxidants such as I2. 44 The reaction mixture was left to stir for several hours until completion as identified by the disappearance of the solid reagent in the reaction flask.…”

Decision-feedback receiver for quasi-orthogonal space-time coded OFDM with correlative coding over fast fading channels

“…The channel has an exponential power-delay profile θ(τ l ) = e −τ l /τrms , where τ rms represents the root-mean square delay spread also normalized with respect to T s . Since the channel is time-variant, the relationship between the channel coefficients for path l of antenna p at times nT s and (n + m)T s can be described by a first-order auto-regressive model as [10] h (p)…”