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Superconductivity by alloying the topological insulator SnBi2Te4
Michael A. McGuire, Heda Zhang, Andrew F. May +7
Alloying indium into the topological insulator Sn1-xInxBi2Te4 induces bulk superconductivity with critical temperatures Tc up to 1.85 K and upper critical fields up to about 14 kOe…
Electronic and topological properties of the van der Waals layered superconductor PtTe
Michael A. McGuire, Yun-Yi Pai, Matthew Brahlek +2
We report the crystal growth and structural and electronic properties of superconducting, van der Waals layered PtTe. Easily cleavable crystals with a plate-like morphology consist…
Superconductivity at 9K in Mo5PB2 with evidence for multiple gaps
Michael A. McGuire, David S. Parker
Superconductivity is observed with critical temperatures near 9K in the tetragonal compound Mo5PB2. This material adopts the Cr5B3 structure type common to supercondcuting Nb5Si3-x…
Anomalous magneto-elastic and charge doping effects in thallium-doped BaFe2As2
A. S. Sefat, L. Li, H. B. Cao +4
Within the BaFe2As2 crystal lattice, we partially substitute thallium for barium and report the effects of interlayer coupling in Ba1-xTlxFe2As2 crystals. We demonstrate the unusua…
Fragile structural transition in Mo3Sb7
J. -Q. Yan, M. A. McGuire, A. F. May +3
MoSb single crystals lightly doped with Cr, Ru, or Te are studied in order to explore the interplay between superconductivity, magnetism, and the cubic-tetragonal structura…
Role of Magnetism in Superconductivity of BaFe2As2: Study of 5d Au-doped Crystals
Li Li, Huibo B. Cao, Michael A. McGuire +3
We investigate properties of BaFe2As2 (122) single crystals upon gold doping, which is the transition metal with the highest atomic weight. The Au substitution into the FeAs-planes…
Tuning the magnetic and structural phase transitions of PrFeAsO via Fe/Ru spin dilution
Yuen Yiu, Pietro Bonfà, Samuele Sanna +5
Neutron diffraction and muon spin relaxation measurements are used to obtain a detailed phase diagram of Pr(Fe,Ru)AsO. The isoelectronic substitution of Ru for Fe acts effectively…
The influence of spin fluctuations on the thermal conductivity in superconducting Ba(Fe_{1-x}Co_x)_2As_2
Andrew F. May, Michael A. McGuire, Jonathan E. Mitchell +2
The thermal conductivity of electron-doped Ba(FeCo)As single crystals is investigated below 200K, with an emphasis on the behavior near the magnetic and superco…
Local structural variation as source of magnetic moment reduction in BaFe2As2
Jennifer L. Niedziela, M. A. McGuire, T. Egami
We report time-of-flight neutron powder diffraction results on stoichiometric BaFe2As2. Pair distribution function analysis shows that the orthorhombic distortion in the a-b plane…
Spin reorientation in TlFe1.6Se2 with complete vacancy ordering
Andrew F. May, Michael A. McGuire, Huibo Cao +5
The relationship between vacancy ordering and magnetism in TlFe1.6Se2 has been investigated via single crystal neutron diffraction, nuclear forward scattering, and transmission ele…
Neutron Diffraction Study of anomalous negative thermal expansion in non-superconducting PrFe1-xRuxAsO
Yuen Yiu, V. Ovidiu Garlea, Michael A. McGuire +3
Neutron powder diffraction has been used to investigate the structural and magnetic behavior of the isoelectronically doped Fe pnictide material PrFe1-xRuxAsO. Substitution of Ru f…
Itinerant electrons, local moments, and magnetic correlations in pnictides high temperature superconductors
P. Vilmercati, A. Fedorov, F. Bondino +11
A direct and element-specific measurement of the local Fe spin moment has been provided by analyzing the Fe 3s core level photoemission spectra in the parent and optimally doped Ce…
Evolution of the nuclear and magnetic structures of TlFe1.6Se2 with temperature
Huibo Cao, Claudia Cantoni, Andrew F. May +6
The evolution of the nuclear and magnetic structures of TlFeSe was determined in the temperature range of 5-450\,K using single crystal neutron diffraction. The Fe laye…
Effect of Molybdenum 4d Hole Substitution in BaFe2As2
Athena S. Sefat, Karol Marty, Andrew D. Christianson +5
We investigate the thermodynamic and transport properties of molybdenum-doped BaFe2As2 (122) crystals, the first report of hole doping using a 4d element. The chemical substitution…
Spatial Inhomogeneity in RFeAsO1-xFx (R =Pr, Nd) Determined from Rare Earth Crystal Field Excitations
E. A. Goremychkin, R. Osborn, C. H. Wang +8
We report inelastic neutron scattering measurements of crystal field transitions in PrFeAsO, PrFeAsO0.87F0.13, and NdFeAsO0.85F0.15. Doping with fluorine produces additional crysta…
Unusual Phase Transitions and Magnetoelastic Coupling in TlFe1.6Se2 Single Crystals
Brian C. Sales, Michael A. McGuire, Andrew F. May +3
Structural, magnetic, electrical transport, and heat capacity data are reported for single crystals of TlFe1.6Se2. This compound crystallizes in a tetragonal structure similar to t…
Structural and Magnetic Phase Transitions in NdCoAsO under High Pressures
Walter Uhoya, Georgiy M. Tsoi, Yogesh K. Vohra +5
We have investigated structural and magnetic phase transitions under high pressures in a quaternary rare earth transition metal arsenide oxide NdCoAsO compound that is isostructura…
Anomalous Compressibility Effects and Superconductivity in EuFe2As2 under High Pressures
Walter Uhoya, Georgiy M. Tsoi Yogesh K. Vohra, Michael A. McGuire +4
The crystal structure and electrical resistance of the structurally-layered EuFe2As2 have been studied up to 70 GPa and down to temperature of 10 K, using a synchrotron x-ray sourc…
Magnetism and Disorder Effects on muSR Measurements of the Magnetic Penetration Depth in Iron-Based Superconductors
J. E. Sonier, W. Huang, C. V. Kaiser +8
It is shown that attempts to accurately deduce the magnetic penetration depth of overdoped BaFe_{1.82}Co_{0.18}As2 single crystals by transverse-field muon spin rotation (TF-muSR)…
Control of Correlations in Sr4V2O6Fe2As2 by Chemical Stoichiometry
Athena S. Sefat, David J. Singh, V. Ovidiu Garlea +4
We show using a combination of powder X-ray and neutron diffraction, first principles calculations, temperature- and field-dependent magnetization, heat capacity and resistivity da…
Effect of annealing on the specific heat of optimally doped Ba(FeCo)As
K. Gofryk, A. S. Sefat, M. A. McGuire +6
We report the temperature dependence of the low-temperature specific heat down to 400 mK of the electron-doped Ba(FeCo)As superconductors. We have mea…
Unusual Relationship between Magnetism and Superconductivity in FeTeSe
H. A. Mook, M. D. Lumsden, A. D. Christianson +8
We use neutron scattering, to study magnetic excitations in crystals near the ideal superconducting composition of FeTeSe. Two types of excitations are found, a res…
Magnetic Phase Transitions in NdCoAsO
Michael A. McGuire, Delphine J. Gout, V. Ovidiu Garlea +3
Magnetization measurements reveal that NdCoAsO undergoes three magnetic phase transitions below room temperature. The crystal and magnetic structures of NdCoAsO have been determine…
Point-contact spectroscopic studies on normal and superconducting AFe_2As_2-type iron-pnictide single crystals
Xin Lu, W. K. Park, H. Q. Yuan +11
Point-contact Andreev reflection spectroscopy (PCARS) is applied to investigate the gap structure in iron pnictide single crystal superconductors of the AFe_2As_2 (A=Ba, Sr) family…