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Title: Selective mass enhancement close to the quantum critical point in BaFe2(As1-xPx)2

Journal Article · · Scientific Reports
 [1]; ORCiD logo [2];  [1];  [2];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [8];  [8];  [9];  [10];  [10];  [10];  [10];  [2]
  1. Dresden Univ. of Technology (Germany); Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  2. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  3. Lomonosov Moscow State Univ. (Russian Federation)
  4. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Lomonosov Moscow State Univ. (Russian Federation)
  5. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Karlsruhe Inst. of Technology (KIT) (Germany)
  6. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  7. Florida State Univ., Tallahassee, FL (United States)
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  9. Tokyo Univ. of Agriculture and Technology (Japan)
  10. Nagoya Univ. (Japan)

A quantum critical point (QCP) is currently being conjectured for the BaFe2(As1-xPx)2 system at the critical value xc ≈ 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 Hc2. Here we report Hc2 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 Hc2 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-xPx)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.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1396128
Report Number(s):
LA-UR-17-23671
Journal Information:
Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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Cited By (4)

Multi-band mass enhancement towards critical doping in a pnictide superconductor journal February 2019
Fe-based superconducting thin films—preparation and tuning of superconducting properties journal August 2019
Universal scaling behavior of the upper critical field in strained FeSe 0.7 Te 0.3 thin films journal September 2018
Mass divergence type metal-insulator transition in charge transfer rare-earth nickelates journal September 2019

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