What did scientists discover?
The mass of the electric charge carriers is found to be enhanced in BaFe2(As1-xPx)2 near the same concentration Xc ~ 0.3 where high-temperature superconductivity is strongest. This experiment is unique in that it finds that mass enhancement occurs only for some of the electric charge carriers. By measuring the magnetic field required to suppress superconductivity, the experiment reveals two classes of charge carriers: the charge carrier mass is enhanced near X = 0.3 in one class but not in the other, which shows little change with X.
Why is this important?
This finding helps us understand the role of quasiparticle mass enhancement near a quantum critical point in one of the leading families of high-temperature superconductors.
Who did the research?
V. Grinenko1,2,3, K. Iida2,3, F. Kurth1,2, D.V. Efremov2, S.-L. Drechsler2, I. Cherniavskii4, I. Morozov 2,4, J. Hänish 2,5, T. Förster6, C. Tarantini7, J. Jaroszynski7, B. Maiorov8, M. Jaime8, A. Yamamoto9, I. Nakamura3, H. Ikuta3 & R. Hühne 2
1TU Dresden, GE; 2IFW Dresden, GE X; 3Nagoya Univ, JP; 4Lomonosov MSU, Russ. Fed.; 5KIT, Karlsruhe, GE; 6HLD-EMFL, Dresden, GE; 7National MagLab, Florida, USA; 8LANL, NM, USA; 9Tokyo Univ. A&T, Tokyo, JP.
Why did they need the MagLab?
The robustness of superconductivity in BaFe2(As1-xPx)2 requires magnetic fields in excess of 60T to study the temperature dependence of the upper critical field Hc2(T).
Details for scientists
- View or download the expert-level Science Highlight, Selective mass enhancement close to a Quantum Critical Point
- Read the full-length publication, Selective mass enhancement close to the quantum critical point in BaFe2(As1-xPx)2, in Nature Scientific Reports
This research was funded by the following grants: G.S. Boebinger (NSF DMR-1157490); V. Grinenko (DFG-GR 4667/1-1)
For more information, contact Marcelo Jaime.