Zobrazeno 1 - 10
of 730
pro vyhledávání: '"Demmel, F"'
Autor:
Tripathi, Rajesh, Adroja, D. T., Ritter, C., Sharma, Shivani, Yang, Chongli, Hillier, A. D., Koza, M. M., Demmel, F., Sundaresan, A., Langridge, S., Higemoto, Wataru, Ito, Takashi U., Strydom, A. M., Stenning, G. B. G., Bhattacharyya, A., Keen, David, Walker, H. C., Perry, R. S., Pratt, Francis, Si, Qimiao, Takabatake, T.
Publikováno v:
Physical Review B 106, 064436 (2022)
We present the results of muon spin relaxation ($\mu$SR) and neutron scattering on the Ce-based quasikagome lattice CeRh$_{1-x}$Pd$_{x}$Sn ($x=0.1$ to 0.75). Our ZF-$\mu$SR results reveal the absence of static long-range magnetic order down to 0.05~K
Externí odkaz:
http://arxiv.org/abs/2208.03148
Publikováno v:
Phys. Rev. B 102, 024437 (2020)
We analyze the low-energy dynamics of quasi one dimensional, large-$S$ quantum antiferromagnets with easy-axis anisotropy, using a semi-classical non-linear sigma model. The saddle point approximation leads to a sine Gordon equation which supports so
Externí odkaz:
http://arxiv.org/abs/2005.14162
Autor:
Gannon, W. J., Zaliznyak, I. A., Wu, L. S., Feiguin, A. E., Tsvelik, A. M., Demmel, F., Qiu, Y., Copley, J. R. D., Kim, M. S., Aronson, M. C.
Publikováno v:
Nature Communications 10, 1123 (2019)
The fundamental excitations in an antiferromagnetic chain of spins-1/2 are spinons, de-confined fractional quasiparticles that when combined in pairs, form a triplet excitation continuum. In an Ising-like spin chain the continuum is gapped and the gr
Externí odkaz:
http://arxiv.org/abs/1907.01067
Autor:
Stock, C., Rodriguez-Rivera, J. A., Schmalzl, K., Demmel, F., Singh, D. K., Ronning, F., Thompson, J. D., Bauer, E. D.
Publikováno v:
Phys. Rev. Lett. 121, 037003 (2018)
CeCo(In$_{0.990}$Hg$_{0.010}$)$_{5}$ is a charge doped variant of the $d$-wave CoCoIn$_{5}$ superconductor with coexistent antiferromagnetic and superconducting transitions occurring at T$_{N}$= 3.4 K and T$_{c}$=1.4 K, respectively. We use neutron d
Externí odkaz:
http://arxiv.org/abs/1807.03008
Autor:
Stock, C., Rodriguez, E. E., Lee, N., Demmel, F., Fouquet, P., Laver, M., Niedermayer, Ch., Su, Y., Nemkovski, K., Green, M A., Rodriguez-Rivera, J. A., Kim, J. W., Zhang, L., Cheong, S. -W.
Publikováno v:
Phys. Rev. Lett. 119, 257204 (2017)
CaFe$_{2}$O$_{4}$ is an anisotropic $S={5\over 2}$ antiferromagnet with two competing $A$ ($\uparrow \uparrow \downarrow \downarrow$) and $B$ ($\uparrow \downarrow \uparrow \downarrow$) magnetic order parameters separated by static antiphase boundari
Externí odkaz:
http://arxiv.org/abs/1712.02853
Autor:
Perrichon, A., Demmel, F.
Publikováno v:
In Nuclear Inst. and Methods in Physics Research, A 11 September 2022 1039
The existence of the phonon-roton minimum has been widely observed for both the solid and liquid phases but so far there is no sufficient theoretical explanation of its origin. In this paper we use a range of techniques to study the dynamics and shor
Externí odkaz:
http://arxiv.org/abs/1706.06553
Autor:
Stock, C., Rodriguez, E. E., Lee, N., Green, M. A., Demmel, F., Ewings, R. A., Fouquet, P., Laver, M., Niedermayer, Ch., Su, Y., Nemkovski, K., Rodriguez-Rivera, J. A., Cheong, S. -W.
Publikováno v:
Phys. Rev. Lett. 117, 017201 (2016)
CaFe$_{2}$O$_{4}$ is a $S={5\over 2}$ anisotropic antiferromagnet based upon zig-zag chains having two competing magnetic structures, denoted as the A ($\uparrow \uparrow \downarrow \downarrow$) and B ($\uparrow \downarrow \uparrow \downarrow$) phase
Externí odkaz:
http://arxiv.org/abs/1606.04243
Autor:
Chisnell, R., Helton, J. S., Freedman, D. E., Singh, D. K., Demmel, F., Stock, C., Nocera, D. G., Lee, Y. S.
Publikováno v:
Phys. Rev. B 93, 214403 (2016)
Topological magnon insulators are a new class of magnetic materials that possess topologically nontrivial magnon bands. As a result, magnons in these materials display properties analogous to those of electrons in topological insulators. Here, we pre
Externí odkaz:
http://arxiv.org/abs/1603.00901