A. Sapkota
Iowa State University
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Featured researches published by A. Sapkota.
Physical Review B | 2016
William R. Meier; Tai Kong; Udhara S. Kaluarachchi; Valentin Taufour; Na Hyun Jo; G. Drachuck; A. E. Böhmer; Scott Saunders; A. Sapkota; A. Kreyssig; M. A. Tanatar; R. Prozorov; A. I. Goldman; Fedor Balakirev; A. Gurevich; S. L. Bud'ko; P. C. Canfield
We grew single-crystalline, single-phase CaKFe4As4 out of a high-temperature, quaternary melt. Temperature-dependent measurements of x-ray diffraction, anisotropic electrical resistivity, elastoresistivity, thermoelectric power, Hall effect, magnetization, and specific heat, combined with field-dependent measurements of electrical resistivity and field and pressure-dependent measurements of magnetization indicate that CaKFe4As4 is an ordered, stoichiometric, Fe-based superconductor with a superconducting critical temperature, Tc=35.0±0.2 K. Other than superconductivity, there is no indication of any other phase transition for 1.8K≤T≤300 K. All of these thermodynamic and transport data reveal striking similarities to those found for optimally or slightly overdoped (Ba1-xKx)Fe2As2, suggesting that stoichiometric CaKFe4As4 is intrinsically close to what is referred to as “optimal-doped” on a generalized, Fe-based superconductor, phase diagram. Furthermore, the anisotropic superconducting upper critical field, Hc2(T), of CaKFe4As4 was determined up to 630 kOe. The anisotropy parameter γ(T)=H
Physical Review Letters | 2015
Ding Hu; Xingye Lu; Wenliang Zhang; Huiqian Luo; Shiliang Li; Peipei Wang; Genfu Chen; Fei Han; Shree R. Banjara; A. Sapkota; A. Kreyssig; A. I. Goldman; Z. Yamani; Christof Niedermayer; Markos Skoulatos; R. Georgii; T. Keller; Pengshuai Wang; Weiqiang Yu; Pengcheng Dai
npj Quantum Materials | 2018
William R. Meier; Qing-Ping Ding; A. Kreyssig; Sergey L. Bud’ko; A. Sapkota; Karunakar Kothapalli; Vladislav Borisov; Roser Valenti; Cristian D. Batista; Peter P. Orth; Rafael M. Fernandes; A. I. Goldman; Y. Furukawa; A. E. Böhmer; Paul C. Canfield
⊥atop{c2}
Physical Review B | 2013
Abhishek Pandey; D. G. Quirinale; W. T. Jayasekara; A. Sapkota; M. G. Kim; R. S. Dhaka; Y. Lee; Thomas W. Heitmann; Peter W. Stephens; V. Ogloblichev; A. Kreyssig; R. J. McQueeney; A. I. Goldman; A. Kaminski; B. N. Harmon; Y. Furukawa; D. C. Johnston
Physical Review B | 2017
Udhara S. Kaluarachchi; Valentin Taufour; A. Sapkota; Vladislav Borisov; Tai Kong; William R. Meier; Karunakar Kothapalli; B. G. Ueland; A. Kreyssig; Roser Valenti; R. J. McQueeney; A. I. Goldman; Sergey L. Bud'ko; Paul C. Canfield
/H
Physical Review B | 2015
W. T. Jayasekara; U. S. Kaluarachchi; B. G. Ueland; Abhishek Pandey; Y. B. Lee; V. Taufour; A. Sapkota; K. Kothapalli; N. S. Sangeetha; G. Fabbris; L. S. I. Veiga; Yejun Feng; A. M. dos Santos; S. L. Bud'ko; B. N. Harmon; P. C. Canfield; D. C. Johnston; A. Kreyssig; A. I. Goldman
Physical Review Letters | 2015
B. G. Ueland; Abhishek Pandey; Y. Lee; A. Sapkota; Y. Choi; D. Haskel; R. A. Rosenberg; J. C. Lang; B. N. Harmon; D. C. Johnston; A. Kreyssig; A. I. Goldman
∥atop{c2}
Physical Review Letters | 2013
Abhishek Pandey; B. G. Ueland; S. Yeninas; A. Kreyssig; A. Sapkota; Yang Zhao; Joel S. Helton; J. W. Lynn; R. J. McQueeney; Y. Furukawa; A. I. Goldman; D. C. Johnston
Physical Review B | 2017
Mehmet Ramazanoglu; A. Sapkota; Abhishek Pandey; J. Lamsal; D. L. Abernathy; Jennifer Niedziela; Matthew Stone; A. Kreyssig; A. I. Goldman; D. C. Johnston; R. J. McQueeney
, for H applied perpendicular and parallel to the c axis, decreases from ≃2.5 at Tc to ≃1.5 at 25 K, which can be explained by interplay of paramagnetic pair breaking and orbital effects. The slopes of dH
Physical Review B | 2017
W. T. Jayasekara; Abhishek Pandey; A. Kreyssig; N. S. Sangeetha; A. Sapkota; K. Kothapalli; V. K. Anand; W. Tian; David Vaknin; D. C. Johnston; R. J. McQueeney; A. I. Goldman; B. G. Ueland
