| Autor: |
V. Grinenko, K. Iida, F. Kurth, D. V. Efremov, S.-L. Drechsler, I. Cherniavskii, I. Morozov, J. Hänisch, T. Förster, C. Tarantini, J. Jaroszynski, B. Maiorov, M. Jaime, A. Yamamoto, I. Nakamura, R. Fujimoto, T. Hatano, H. Ikuta, R. Hühne |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
Scientific Reports, Vol 7, Iss 1, Pp 1-7 (2017) |
| Druh dokumentu: |
article |
| ISSN: |
2045-2322 |
| DOI: |
10.1038/s41598-017-04724-3 |
| Popis: |
Abstract A quantum critical point (QCP) is currently being conjectured for the BaFe2(As1−x P x )2 system at the critical value x c ≈ 0.3. In the proximity of a QCP, all thermodynamic and transport properties are expected to scale with a single characteristic energy, given by the quantum fluctuations. Such a universal behavior has not, however, been found in the superconducting upper critical field H c2. Here we report H c2 data for epitaxial thin films extracted from the electrical resistance measured in very high magnetic fields up to 67 Tesla. Using a multi-band analysis we find that H c2 is sensitive to the QCP, implying a significant charge carrier effective mass enhancement at the doping-induced QCP that is essentially band-dependent. Our results point to two qualitatively different groups of electrons in BaFe2(As1−x P x )2. The first one (possibly associated to hot spots or whole Fermi sheets) has a strong mass enhancement at the QCP, and the second one is insensitive to the QCP. The observed duality could also be present in many other quantum critical systems. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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