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Selective mass enhancement close to the quantum critical point in BaFe(As P ).

Title: Selective mass enhancement close to the quantum critical point in BaFe(As P ).
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Name(s): Grinenko, V, author
Iida, K, author
Kurth, F, author
Efremov, D V, author
Drechsler, S-L, author
Cherniavskii, I, author
Morozov, I, author
Hänisch, J, author
Förster, T, author
Tarantini, C, author
Jaroszynski, J, author
Maiorov, B, author
Jaime, M, author
Yamamoto, A, author
Nakamura, I, author
Fujimoto, R, author
Hatano, T, author
Ikuta, H, author
Hühne, R, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2017-07-04
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: A quantum critical point (QCP) is currently being conjectured for the BaFe(As P ) system at the critical value x  ≈ 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 . Here we report H  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 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 BaFe(As P ). 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.
Identifier: FSU_pmch_28676703 (IID), 10.1038/s41598-017-04724-3 (DOI), PMC5496881 (PMCID), 28676703 (RID), 28676703 (EID), 10.1038/s41598-017-04724-3 (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5496881.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_28676703
Owner Institution: FSU
Is Part Of: Scientific reports.
2045-2322
Issue: iss. 1, vol. 7

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Grinenko, V., Iida, K., Kurth, F., Efremov, D. V., Drechsler, S. -L., Cherniavskii, I., … Hühne, R. (2017). Selective mass enhancement close to the quantum critical point in BaFe(As P ). Scientific Reports. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_28676703