Zobrazeno 1 - 10
of 79
pro vyhledávání: '"Ahilan, K"'
Publikováno v:
Physical Review B 90, 014520(2014)
We use NMR techniques to investigate the magnetic properties of BaCo2As2 single crystals, the non-superconducting end member of the Co-substituted iron-pnictide high Tc superconductor Ba(Fe1-xCox)2As2 with x = 1. We present 75As NMR evidence for enha
Externí odkaz:
http://arxiv.org/abs/1407.2750
Autor:
Ahilan, K.
In this dissertation I have reported and discussed the results that suggest that superconductivity arises out of itinerant electron ferromagnetism in UGe2. Superconductivity is observed in the milli-Kelvin temperature range and close to but below the
Externí odkaz:
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595374
Autor:
Ahilan, K., Ning, F. L., Imai, T., Sefat, A. S., McGuire, M. A., Sales, B. C., Mandrus, D., Cheng, P., Shen, B., Wen, H. H.
We will examine the possible link between spin fluctuations and the superconducting mechanism in the iron-based high temperature superconductor Ba(Fe,Co)2As2 based on NMR and high pressure transport measurements.
Comment: Invited paper to m2s-IX
Comment: Invited paper to m2s-IX
Externí odkaz:
http://arxiv.org/abs/0910.1071
Autor:
Ning, F. L., Ahilan, K., Imai, T., Sefat, A. S., McGuire, M. A., Sales, B. C., Mandrus, D., Cheng, P., Shen, B., Wen, H. -H
Publikováno v:
Physical Review Letters 104, 037001 (2010)
We report the first NMR investigation of spin dynamics in the overdoped non-superconducting regime of Ba(Fe[1-x]Co[x])2As2 up to x =0.26. We demonstrate that the absence of inter-band transitions with large momentum transfer Q(AF) ~ (pi, 0) between t
Externí odkaz:
http://arxiv.org/abs/0907.3875
Publikováno v:
Phys. Rev. B 79 (2009) 214520
We report comprehensive resistivity measurements of single crystalline samples of the Ba(Fe(1-x)Co(x))2As2 high Tc superconductor under hydrostatic pressure up to 2.75 GPa and over a broad concentration range, 0 < x < 0.099. We show that application
Externí odkaz:
http://arxiv.org/abs/0904.2215
Publikováno v:
Phys. Rev. Lett. 102 (2009) 177005.
Unlike the parent phases of the iron-arsenide high Tc superconductors, undoped FeSe is not magnetically ordered and exhibits superconductivity with Tc~9K. Equally surprising is the fact that applied pressure dramatically enhances the modest Tc to ~37
Externí odkaz:
http://arxiv.org/abs/0902.3832
Autor:
Ning, F. L., Ahilan, K., Imai, T., Sefat, A. S., Jin, R., McGuire, M. A., Sales, B. C., Mandrus, D.
Publikováno v:
Physical Review B, 79, 140506(R), (2009)
We investigate the electronic properties of Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04) in the lightly electron-doped regime by 59Co and 75As NMR. We demonstrate that Co doping significantly suppresses the magnetic ordering temperature to the SDW state, T_{
Externí odkaz:
http://arxiv.org/abs/0902.1788
Autor:
Ning, F. L., Ahilan, K., Imai, T., Sefat, A. S., Jin, R., McGuire, M. A., Sales, B. C., Mandrus, D.
Publikováno v:
J. Phys. Soc. Jpn. 78 (2009) 013711
We report a systematic investigation of Ba[Fe(1-x)Co(x)]2As2 based on transport and 75-As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively suppresses the uniform spin susceptibility and low freque
Externí odkaz:
http://arxiv.org/abs/0811.1617
Autor:
Ahilan, K., Balasubramaniam, J., Ning, F. L., Imai, T., Sefat, A. S., Jin, R., McGuire, M. A., Sales, B. C., Mandrus, D.
Publikováno v:
J. Phys.: Condens. Matter 20 (2008) 472201. (Fast Track Communications)
Application of pressures or electron-doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe(2)As(2) into a superconductor with the Tc exceeding 20K. We carried out systematic transport measurements of BaFe(2-x)Co(x
Externí odkaz:
http://arxiv.org/abs/0810.0287
Autor:
Imai, T., Ahilan, K., Ning, F. L., McGuire, M. A., Sefat, A. S., Jin, R., Sales, B. C., Mandrus, D.
Publikováno v:
J. Phys. Soc. Jpn. 77 (2008) Supplement C pp.47-53
We will probe the intrinsic behavior of spin susceptibility chi_(spin) in the LaFeAsO(1-x)F(x) superconductor (x ~ 0.1, Tc ~ 27K) using 19-F and 75-As NMR techniques. Our new results firmly establish the pseudo-gap behavior with Delta_(PG)/kB ~ 140K.
Externí odkaz:
http://arxiv.org/abs/0810.0305