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Search for decays into vector meson pairs
The BESIII Collaboration
The processes $\etacpto ρ^{0}ρ^{0}$, , and are searched for using a sample of $\psip$ events collected with the BESIII detector at the B…
Superconductivity at 33 K in potassium-doped 1,2:8,9-dibenzopentacene
Mianqi Xue, Tingbing Cao, Duming Wang +6
We report the observation of superconductivity at 33 K in K-doped 1,2:8,9-dibenzopentacene (C30H18). This is higher than any Tc reported previously for an organic superconductor be…
Measurements of the mass and width of the eta_c using psi' -> gamma eta_c
BESIII Collaboration, M. Ablikim, M. N. Achasov +332
The mass and width of the lowest lying S-wave spin singlet charmonium state, the eta_c, are measured using a data sample of 1.06x10^8 psi' decays collected with the BESIII detector…
Two-magnon Raman scattering in AFeSe systems: competition between superconductivity and antiferromagnetic order
A. M. Zhang, J. H. Xiao, Y. S. Li +6
We have performed Raman-scattering measurements on high-quality single crystals of AFeSe superconductors of several compositions. We find a broad, asymmetric pe…
Magnetism in superconducting EuFeAsP single crystals studied by local probes
J. Munevar, H. Micklitz, M. Alzamora +11
We have studied the magnetism in superconducting single crystals of EuFe2 As1.4 P0.6 by using the local probe techniques of zero-field muon spin rotation/relaxation and 151 Eu/57 F…
Intrinsic Percolative Superconductivity in KxFe2-ySe2 Single Crystals
B. Shen, B. Zeng, G. F. Chen +4
Magnetic field penetration and magnetization hysteresis loops (MHLs) have been measured in KxFe2-ySe2 single crystals. The magnetic field penetration shows a two-step feature with…
On the Structure of Vacancy Ordered Superconducting Alkali Metal Iron Selenide
P. Zavalij, Wei Bao, X. F. Wang +9
With single crystal X-ray diffraction studies, we compare the structures of three sample showing optimal superconductivity, K0.774(4)Fe1.613(2)Se2, K0.738(6)Fe1.631(3)Se2 and Cs0.7…
A Novel Large Moment Antiferromagnetic Order in K0.8Fe1.6Se2 Superconductor
Wei Bao, Q. Huang, G. F. Chen +5
The discovery of cuprate high Tc superconductors has inspired searching for unconventional su- perconductors in magnetic materials. A successful recipe has been to suppress long-ra…
The effect of varying Fe-content on transport properties of K intercalated iron selenide KxFe2-ySe2
D. M. Wang, J. B. He, T. -L. Xia +1
We report the successful growth of high-quality single crystals of potassium intercalated iron selenide KxFe2-ySe2 by Bridgeman method. The effect of iron vacancies on transport pr…
Vacancy ordering and phonon spectrum in the Fe superconductor KFeSe
A. M. Zhang, K. Liu, J. H. Xiao +5
We have performed Raman-scattering measurements on a high-quality single crystal of the recently discovered Fe-based superconductor KFeSe ( = 32 K). At lea…
Microstructure and Fe-vacancy ordering in the KFexSe2 superconducting system
Z. Wang, Y. J. Song, H. L. Shi +7
Structural investigations by means of transmission electron microscopy (TEM) on KFexSe2 with 1.5 \leq x \leq 1.8 have revealed a rich variety of microstructure phenomena, the KFe1.…
77Se NMR study of pairing symmetry and spin dynamics in KyFe2-xSe2
Weiqiang Yu, L. Ma, J. B. He +4
We present a 77Se NMR study of the newly discovered iron selenide superconductor KyFe2-xSe2, in which Tc = 32 K. Below Tc, the Knight shift 77K drops sharply with temperature, prov…