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Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO
H. D. Zhou, P. M. Sarte, B. S. Conner +8
The fluorine-doped rare-earth iron oxypnictide series SmFeAsOF (0 0.10) was investigated with high resolution powder x-ray scattering. In agreement with p…
Crystal structure, physical properties and superconductivity in FeSe single crystals
X. G. Luo, X. F. Wang, J. J. Ying +9
We studied the correlation among structure and transport properties and superconductivity in the different FeSe single crystals ( = K, Rb, and Cs). Two sets of (00$…
Pressure effect on superconductivity of FeSe ( = K and Cs)
J. J. Ying, X. F. Wang, X. G. Luo +9
We performed the high hydrostatic pressure resistivity measurements (up to 1.7 GPa) on the newly discovered superconductors FeSe ( = K and Cs) single crystals. Tw…
Superconductivity and Magnetic Properties of high-quality single crystals of FeSe ( = K and Cs)
J. J. Ying, X. F. Wang, X. G. Luo +8
We successfully grew the high-quality single crystals of FeSe ( = K and Cs) by self-flux method. Sharp superconducting transition was observed for both types of c…
Study of Electron Spin Resonance on single crystals
J. J. Ying, T. Wu, Q. J. Zheng +8
The temperature dependence of electron spin resonance (ESR) was studied in (x = 0.0, 0.067, 0.1, 0.2, 0.25, 0.285, 0.35, 0.4 and 0.5). The ESR spectrum of a…
Magnetism and superconductivity in single crystals
Q. J. Zheng, Y. He, T. Wu +9
We systematically studied the transport properties of single crystals of Co. Co doping can suppress the spin-density wave (SDW) ordering and induces…
High-field phase-diagram of Fe arsenide superconductors
Y. J. Jo, J. Jaroszynski, A. Yamamoto +13
Here, we report an overview of the phase diagram of single layered and double layered Fe arsenide superconductors at high magnetic fields. Our systematic magnetotransport measureme…
Abnormal T-linear susceptibility and Phase diagram of BaFeCoAs single crystals
X. F. Wang, T. Wu, G. Wu +4
We study systematically transport, susceptibility and heat capacity for BaFeCoAs single crystals. In the underdoped region, spin density wave (SDW) transition is ob…
Transport properties and superconductivity in KLnFeAs (Ln=Sm, Nd and La) system
R. H. Liu, G. Wu, H. Chen +8
We prepared the samples KLnFeAs (Ln=Sm, Nd and La) with ThCrSi-type structure. These samples were characterized by X-ray diffraction, resistivity, sus…
Heat capacity measurements on FeAs-based compounds: a thermodynamic probe of electronic and magnetic states
P. J. Baker, S. R. Giblin, F. L. Pratt +7
We report heat capacity measurements of the pnictide materials SmFeAsOF, NdFeAsO, LaFeAsOF and LiFeAs. For SmFeAsOF, with x close to 0.1, we use…
Superconductivity at 56 K in Samarium-doped SrFeAsF
G. Wu, Y. L. Xie, H. Chen +9
We synthesized the samples SrSmFFeAs with ZrCuSiAs-type structure. These samples were characterized by resistivity and susceptibility. It is found that substitution of…
Doping-Driven Collapse of the SDW Correlation Gap in SmFeAsOF
Scott C. Riggs, R. D. McDonald, J. B. Kemper +8
We report the Hall resistivity, of polycrystalline SmFeAsOF for four different fluorine concentrations from the onset of superconductivity through the collap…
Probing multi-band superconductivity and magnetism in SmFeAsOF single crystals by high-field vortex torque magnetometry
L. Balicas, A. Gurevich, Y. J. Jo +9
To probe manifestations of multiband superconductivity in oxypnictides, we measured the angular dependence of magnetic torque in the mixed state of SmOFFeAs…
Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2
H. Chen, Y. Ren, Y. Qiu +8
The relation between the spin-density-wave (SDW) and superconducting order is a central topic in current research on the FeAs-based high Tc superconductors. Conflicting results exi…
Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation
A. J. Drew, Ch. Niedermayer, P. J. Baker +13
The recent observation of superconductivity with critical temperatures up to 55 K in the FeAs based pnictide compounds marks the first discovery of a non copper-oxide based layered…
Different resistivity response to spin density wave and superconductivity at 20 K in
G. Wu, H. Chen, T. Wu +6
We report that intrinsic transport and magnetic properties, and their anisotropy from high quality single crystal . The resistivity anisotropy () is $\sim 5…
Log-T divergence and Insulator-to-Metal Crossover in the normal state resistivity of fluorine doped SmFeAsO1-xFx
S. C. Riggs, J. B. Kemper, Y. Jo +8
We report the resistivity of a series of fluorine-doped SmFeAsO1-xFx polycrystalline superconductors in magnetic fields up to 60T. For underdoped samples (x < 0.15), the low temper…
Far-infrared probe of superconductivity in SmOFFeAs}
S. I. Mirzaei, V. Guritanu, A. B. Kuzmenko +5
We report far-infrared reflectance measurements on polycrystalline superconducting samples of SmOFFeAs ( = 0.12, 0.15 and 0.2). We clearly observe superconductivit…
Superconductivity induced by oxygen deficiency in Sr-doped LaOFeAs
G. Wu, H. Chen, Y. L. Xie +7
We synthesized Sr-doped sample with single phase, and systematically studied the effect of oxygen deficiency in the Sr-doped LaOFeAs system. It is found t…
Common Features in Electronic Structure of the Fe-Based Layered Superconductors from Photoemission Spectroscopy
Xiaowen Jia, Haiyun Liu, Wentao Zhang +23
High resolution photoemission measurements have been carried out on non-superconducting LaOFeAs parent compound and various superconducting R(O1-xFx)FeAs (R=La, Ce and Pr) compound…
Doping-insensitive density-of-states suppression in polycrystalline iron-based superconductor SmOFFeAs
H. W. Ou, Y. Zhang, J. F. Zhao +15
We investigated the temperature dependence of the density-of-states in the iron-based superconductor SmO_1-xF_xFeAs (x=0, 0.12, 0.15, 0.2) with high resolution angle-integrated pho…
The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
T. Y. Chen, Z. Tesanovic, R. H. Liu +2
Since the discovery of superconductivity in the cuprates two decades ago, it has been firmly established that the CuO_2 plane is consequential for high T_C superconductivity and a…
Superconducting Gap and Pseudogap in Sm(OF)FeAs Layered Superconductor from Photoemission Spectroscopy
Haiyun Liu, Xiaowen Jia, Wentao Zhang +20
High resolution photoemission measurements have been carried out on non-superconducting SmOFeAs parent compound and superconducting Sm(OF)FeAs (x=0.12, and 0.15) compou…
Superconducting energy gap and c-axis plasma frequency of (Nd,Sm)O0.82F0.18FeAs superconductors from infrared ellipsometry
A. Dubroka, K. W. Kim, M. Roessle +5
We present ellipsometric measurements of the far-infrared dielectric response of polycrystalline samples of the new pnictide superconductor RO0.82F0.18FeAs (R=Nd and Sm). We find e…