John B. Warren

activity

20092018

most citedPauli-limited upper critical field in Fe1+yTe1-xSex

126 citations · 384 across the 9 of their papers we have counts for

collaborators

9 papers

cond-mat.str-el2018★ 13 cited

Thermoelectric studies of Ir $_{1 - x}$ Rh $_{x}$ Te $_{2}$ (0 $⩽ x ⩽$ 0.3)

Yu Liu, $^{1}$ Hechang Lei, $^{1}$ Kefeng Wang +5

We report thermoelectric properties of Ir $_{1 - x}$ Rh $_{x}$ Te $_{2}$ ( $0 ⩽ x ⩽ 0.3$ ) alloy series where superconductivity at low temperatures emerges as the high-temperatu…

cond-mat.supr-con2016★ 1 cited

Multiband behavior and non-metallic low-temperature state of K $_{0.50}$ Na $_{0.24}$ Fe $_{1.52}$ Se $_{2}$

Hyejin Ryu, F. Wolff-Fabris, J. B. Warren +3

We report evidence for multiband transport and an insulating low-temperature normal state in superconducting K $_{0.50}$ Na $_{0.24}$ Fe $_{1.52}$ Se $_{2}$ with $T_{c} \approx 20$ K. The…

cond-mat.supr-con2016★ 9 cited

Insulating and metallic spin glass in K $_{x}$ Fe $_{2 - δ - y}$ Ni $_{y}$ Se $_{2}$ (0.06 $\leq$ $y$ $\leq$ 1.44) single crystals

Hyejin Ryu, Milinda Abeykoon, Kefeng Wang +6

We report electron doping effects by Ni in K $_{x}$ Fe $_{2 - δ - y}$ Ni $_{y}$ Se $_{2}$ (0.06 $\leq$ $y$ $\leq$ 1.44) single crystal alloys. A rich ground state phase diagram is observed. S…

cond-mat.supr-con2014★ 4 cited

Nonmetallic Low-Temperature Normal State of K0.70Fe1.46Se1.85Te0.15

Kefeng Wang, Hyejin Ryu, Erik Kampert +4

The normal-state in-plane resistivity below the zero-field superconducting transition temperature $T_{c}$ and the upper critical field Hc2 were measured by suppressing superconductiv…

cond-mat.supr-con2012

Physical properties of KxNi2-ySe2 single crystals

Hechang Lei, Kefeng Wang, Hyejin Ryu +3

We have synthesized K0.95(1)Ni1.86(2)Se2 single crystals. The single crystals contain K and Ni deficiencies not observed in KNi2Se2 polycrystals. Unlike KNi2Se2 polycrystals, the s…

cond-mat.supr-con2011★ 79 cited

Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion

Hechang Lei, Milinda Abeykoon, Emil S. Bozin +3

We report structurally tuned superconductivity in KxFe2-ySe2-zSz (0<=z<=2) phase diagram. Superconducting Tc is suppressed as S is incorporated into the lattice, eventually vanishi…