Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Erwin, R. W."'
Autor:
Thampy, V., Kang, J., Rodriguez-Rivera, J. A., Bao, W., Savici, A. T., Hu, J., Liu, T. J., Qian, B., Fobes, D., Mao, Z. Q., Fu, C. B., Chen, W. C., Ye, Q., Erwin, R. W., Gentile, T. R., Tesanovic, Z., Broholm, C.
Using polarized and unpolarized neutron scattering we show that interstitial Fe in superconducting Fe_{1+y}Te_{1-x}Se_x induces a magnetic Friedel-like oscillation that diffracts at Q_(in-plane)=(1/2,0) and involves >50 neighboring Fe sites. The inte
Externí odkaz:
http://arxiv.org/abs/1109.5196
Autor:
Bao, Wei, Wang, Y. X., Qiu, Y., Li, K., Lin, J. H., Copley, J. R. D., Erwin, R. W., Dennis, B. S., Ramirez, A. P.
We report a spin S = 3/2 triangular antiferromagnet with nearest-neighbor coupling J = 0.29 meV in La2Ca2MnO7. A genuinely two-dimensional, three-sublattice order develops below 2.80 K << the Weiss constant (25 K). The spin excitations deviate substa
Externí odkaz:
http://arxiv.org/abs/0910.1904
Recent theoretical and experimental work on solid He-4 has focused on vacancies, or other lattice defects and whether these can form a Bose-Einstein condensate within the solid. The earliest suggestion that this could happen was based on the conjectu
Externí odkaz:
http://arxiv.org/abs/0802.3587
Publikováno v:
J. Appl. Phys. 95, 7369 (2004)
We have investigated the peculiar structure of charge and spin ordering in the half-doped layered perovskite oxide La$_{1.5}$Sr$_{0.5}$CoO$_4$ by elastic neutron scattering. Two samples with different preparation histories were studied. We find that
Externí odkaz:
http://arxiv.org/abs/cond-mat/0310662
Autor:
Khaykovich, B., Birgeneau, R. J., Chou, F. C., Erwin, R. W., Kastner, M. A., Lee, S. -H., Lee, Y. S., Smeibidl, P., Vorderwisch, P., Wakimoto, S.
Publikováno v:
Phys. Rev. B 67, 054501 (2003)
We have measured the enhancement of the static incommensurate spin-density wave (SDW) order by an applied magnetic field in stage-4 and stage-6 samples of superconducting La2CuO(4+y). We show that the stage-6 La2CuO(4+y) (Tc=32 K) forms static long-r
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209648
We report a neutron scattering study of the dynamic spin correlations in Rb$_2$MnF$_4$, a two-dimensional spin-5/2 antiferromagnet. By tuning an external magnetic field to the value for the spin-flop line, we reduce the effective spin anisotropy to e
Externí odkaz:
http://arxiv.org/abs/cond-mat/0101097
We report a neutron scattering study of the long-wavelength dynamic spin correlations in the model two-dimensional $S=1/2$ square lattice Heisenberg antiferromagnets Sr$_2$CuO$_2$Cl$_2$ and Sr$_2$Cu$_3$O$_4$Cl$_2$. The characteristic energy scale, $\
Externí odkaz:
http://arxiv.org/abs/cond-mat/0012239
Autor:
Bao, Wei, Pagliuso, P. G., Sarrao, J. L., Thompson, J. D., Fisk, Z., Lynn, J. W., Erwin, R. W.
Publikováno v:
Phys. Rev. B, vol. 62, R14621 (2000) with erratum: PRB vol. 67, 099903(E) (2003)
The magnetic structure of the heavy fermion antiferromagnet CeRhIn5 is determined using neutron diffraction. We find a magnetic wave vector q_M=(1/2,1/2,0.297), which is temperature independent up to T_N=3.8K. A staggered moment of 0.374(5) Bohr magn
Externí odkaz:
http://arxiv.org/abs/cond-mat/0010196
Autor:
Kim, Y. J., Birgeneau, R. J., Chou, F. C., Greven, M., Kastner, M. A., Lee, Y. S., Wells, B. O., Aharony, A., Entin-Wohlman, O., Korenblit, I. Ya., Harris, A. B., Erwin, R. W., Shirane, G.
We report a neutron scattering study on the tetragonal compound Sr_2Cu_3O_4Cl_2, which has two-dimensional (2D) interpenetrating Cu_I and Cu_{II} subsystems, each forming a S=1/2 square lattice quantum Heisenberg antiferromagnet (SLQHA). The mean-fie
Externí odkaz:
http://arxiv.org/abs/cond-mat/0009314
Autor:
Kiryukhin, V., Kim, Y. J., Thomas, K. J., Chow, F. C., Erwin, R. W., Huang, Q., Kastner, M. A., Birgeneau, R. J.
We report single crystal growth and magnetic susceptibility and neutron diffraction studies of the S=1/2 quasi-1D antiferromagnet CaCu2O3. The structure of this material is similar to that of the prototype two-leg spin-ladder compound SrCu2O3. Howeve
Externí odkaz:
http://arxiv.org/abs/cond-mat/0009158