Kyuil Cho
Iowa State University
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Featured researches published by Kyuil Cho.
Science | 2012
K. Hashimoto; Kyuil Cho; T. Shibauchi; S. Kasahara; Y. Mizukami; Ryo Katsumata; Y. Tsuruhara; Takahito Terashima; Hiroaki Ikeda; M. A. Tanatar; Haruhisa Kitano; N. Salovich; R. W. Giannetta; P. Walmsley; Antony Carrington; Ruslan Prozorov; Y. Matsuda
A Spike Inside the Dome The transition temperature Tc of iron-based superconductors has a dome-shaped dependence on chemical doping, and the superconductivity that develops underneath may obscure a potential quantum critical point (QCP) residing at absolute zero. With the aim of detecting signatures of this quantum criticality, Hashimoto et al. (p 1554; see the Perspective by Sachdev) measured the penetration depth of the pnictide series BaFe2(As1−xPx)2 as a function of x. A sharp peak right around the point where Tc has a maximum (x = 0.30) was observed, implying that the superfluid density diminishes sharply where one would expect it to be the most robust. This unusual finding is interpreted as a sign of a QCP at x = 0.30. A quantum critical point may be lurking inside the superconducting dome of a pnictide series. In a superconductor, the ratio of the carrier density, n, to its effective mass, m*, is a fundamental property directly reflecting the length scale of the superfluid flow, the London penetration depth, λL. In two-dimensional systems, this ratio n/m* (~1/λL2) determines the effective Fermi temperature, TF. We report a sharp peak in the x-dependence of λL at zero temperature in clean samples of BaFe2(As1–xPx)2 at the optimum composition x = 0.30, where the superconducting transition temperature Tc reaches a maximum of 30 kelvin. This structure may arise from quantum fluctuations associated with a quantum critical point. The ratio of Tc/TF at x = 0.30 is enhanced, implying a possible crossover toward the Bose-Einstein condensate limit driven by quantum criticality.
Physical Review B | 2011
William A. Coniglio; Laurel E. Winter; Kyuil Cho; Charles C. Agosta; B. Fravel; Lawrence K. Montgomery
We report the phase diagram of
Physical Review B | 2017
Kyuil Cho; A. Fente; Serafim Teknowijoyo; M. A. Tanatar; Kamal Joshi; N. M. Nusran; T. Kong; William R. Meier; U. Kaluarachchi; I. Guillamón; H. Suderow; Sergey L. Bud'ko; Paul C. Canfield; Ruslan Prozorov
\lambda
Physical Review B | 2016
Serafim Teknowijoyo; Kyuil Cho; M. A. Tanatar; J. Gonzales; A. E. Böhmer; O. Cavani; Vivek Mishra; P. J. Hirschfeld; S. L. Bud'ko; P. C. Canfield; Ruslan Prozorov
-(BETS)
Physical Review B | 2011
Kyuil Cho; H. Kim; M. A. Tanatar; Jin Hu; B. Qian; Z. Q. Mao; Ruslan Prozorov
_2
Physical Review B | 2016
Mojammel A. Khan; Amar B. Karki; Tapas Samanta; Dana A. Browne; Shane Stadler; Ilya Vekhter; Abhishek Pandey; P. W. Adams; D. P. Young; Serafim Teknowijoyo; Kyuil Cho; R. Prozorov; D. Graf
GaCl
Physical Review B | 2016
Shan Jiang; Chang Liu; Huibo Cao; Turan Birol; Jared M. Allred; Wei Tian; Lian Liu; Kyuil Cho; Matthew Krogstad; Jie Ma; Keith M. Taddei; M. A. Tanatar; M. Hoesch; Ruslan Prozorov; Stephan Rosenkranz; Y. J. Uemura; Gabriel Kotliar; N. Ni
_4
Physical Review B | 2014
C. P. Strehlow; M. Konczykowski; J. Murphy; Serafim Teknowijoyo; Kyuil Cho; M. A. Tanatar; T. Kobayashi; S. Miyasaka; S. Tajima; Ruslan Prozorov
from rf penetration depth measurements with a tunnel diode oscillator in a pulsed magnetic field. We examined four samples with 1100 field sweeps in a range of angles with the magnetic field parallel and perpendicular to the conducting planes. In the parallel direction,
Physical Review B | 2013
J. Murphy; C. P. Strehlow; Kyuil Cho; M. A. Tanatar; N. Salovich; R. W. Giannetta; T. Kobayashi; S. Miyasaka; S. Tajima; Ruslan Prozorov
H_{c2}
Physical Review B | 2012
N. Spyrison; M. A. Tanatar; Kyuil Cho; Young-A Song; Pengcheng Dai; Chenglin Zhang; Ruslan Prozorov
appears to include a tricritical point at 1.6 K and 10 T with a phase line that increases to 11 T as the temperature is decreased to} 500 mK. The second phase line forms a clearly defined high field low temperature region satisfying several of the conditions of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. We show remarkably good fits of