Zobrazeno 1 - 10
of 68
pro vyhledávání: '"Reich, D. H."'
We examine the magnetic field dependent excitations of the dimerized spin-1/2 chain, copper nitrate, with antiferromagnetic intra-dimer exchange $J_1=0.44$ meV and exchange alternation $\alpha=J_2/J_1=0.24$. Magnetic excitations in three distinct reg
Externí odkaz:
http://arxiv.org/abs/1406.7596
Publikováno v:
Phys. Rev. B 75, 214409 (2007)
Field-dependent specific heat and neutron scattering measurements were used to explore the antiferromagnetic S=1/2 chain compound CuCl2 * 2((CD3)2SO). At zero field the system acquires magnetic long-range order below TN=0.93K with an ordered moment o
Externí odkaz:
http://arxiv.org/abs/cond-mat/0701228
Autor:
Stone, M. B., Broholm, C., Reich, D. H., Schiffer, P., Tchernyshyov, O., Vorderwisch, P., Harrison, N.
We report magnetic susceptibility, specific heat, and neutron scattering measurements as a function of applied magnetic field and temperature to characterize the $S=1/2$ quasi-two-dimensional frustrated magnet piperazinium hexachlorodicuprate (PHCC).
Externí odkaz:
http://arxiv.org/abs/cond-mat/0611463
Autor:
Hong, Tao, Kenzelmann, M., Turnbull, M. M., Landee, C. P., Lewis, B. D., Schmidt, K. P., Uhrig, G. S., Qiu, Y., Broholm, C., Reich, D. H.
Publikováno v:
Phys. Rev. B 74, 094434 (2006)
Inelastic neutron scattering measurements are reported for a powder sample of the spin-1/2 quantum paramagnet $\rm Cu(Quinoxaline)Br_2$. Magnetic neutron scattering is identified above an energy gap of 1.9 meV. Analysis of the sharp spectral maximum
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603592
Exchange interactions between $S=\frac{1}{2}$ sites in piperazinium hexachlorodicuprate produce a frustrated bilayer magnet with a singlet ground state. We have determined the field-temperature phase diagram by high field magnetization and neutron sc
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503450
Publikováno v:
Phys. Rev. B 71, 094411 (2005)
We report an experimental and theoretical study of the antiferromagnetic S=1/2 chain subject to uniform and staggered fields. Using inelastic neutron scattering, we observe a novel bound-spinon state at high energies in the linear chain compound CuCl
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503135
Mechanically bent nickel nanowires show clear features in their room temperature magnetoresistance when a domain wall is pinned at the location of the bend. By varying the direction of an applied magnetic field, the wire can be prepared either in a s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308579
Publikováno v:
Phys. Rev. Lett. 93, 017204 (2004).
Inelastic neutron scattering was used to measure the magnetic field dependence of spin excitations in the antiferromagnetic S=1/2 chain CuCl_2 2(dimethylsulfoxide) (CDC) in the presence of uniform and staggered fields. Dispersive bound states emerge
Externí odkaz:
http://arxiv.org/abs/cond-mat/0305476
Autor:
Stone, M. B., Reich, D. H., Broholm, C., Lefmann, K., Rischel, C., Landee, C. P., Turnbull, M. M.
Measurements are reported of the magnetic field dependence of excitations in the quantum critical state of the spin S=1/2 linear chain Heisenberg antiferromagnet copper pyrazine dinitrate (CuPzN). The complete spectrum was measured at k_B T/J <= 0.02
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303364
Autor:
Tennant, D. A., Broholm, C., Reich, D. H., Nagler, S. E., Granroth, G. E., Barnes, T., Damle, K., Xu, G., Chen, Y., Sales, B. C.
Publikováno v:
Phys. Rev. B 67, 054414 (2003)
We report measurements of the two-magnon states in a dimerized antiferromagnetic chain material, copper nitrate (Cu(NO3)2*2.5D2O). Using inelastic neutron scattering we have measured the one and two magnon excitation spectra in a large single crystal
Externí odkaz:
http://arxiv.org/abs/cond-mat/0207678