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DH Reich

Publications and source records attributed to DH Reich.

16 recordsLinked to original sources
PubMed2000

Triplet waves in a quantum spin liquid

We report a neutron scattering study of the spin- 1/2 alternating bond antiferromagnet Cu(NO3)(2);2.5D(2)O for 0.06<k(B)T/J1<1.5. For k(B)T/J1<<1 the excitation spectrum is dominated by a coherent singlet-triplet mode centered at J1 = 0.442(2) meV with sinusoidal dispersion and a bandwidth of J2 = 0.106(2) meV. A complete description of the zero temperature contribution to the scattering function from this mode is provided by the single mode approximation. At finite temperatures we observe exponentially activated band narrowing and damping. The relaxation rate is thermally activated and wave vector dependent with the periodicity of the reciprocal lattice.

Journal Article↗
PubMed1999

Large magnetoresistance of electrodeposited single-crystal bismuth thin films

Single-crystal bismuth thin films 1 to 20 micrometers thick were fabricated by electrodeposition and suitable annealing. Magnetoresistance up to 250 percent at 300 kelvin and 380,000 percent at 5 kelvin as well as clean Shubnikov-de Haas oscillations were observed, indicative of the high quality of these films. A hybrid structure was also made that showed a large magnetoresistive effect of 30 percent at 200 oersted and a field sensitivity of 0.2 percent magnetoresistance per oersted at room temperature.

Journal Article↗