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Title: Thermodynamic properties of nodal superconductors close to a magnetic quantum critical point

Journal Article · · Physical Review. B
ORCiD logo [1];  [2];  [3]; ORCiD logo [1]
  1. University of Wisconsin–Madison, WI (United States)
  2. Kent State University, OH (United States)
  3. Hebrew University of Jerusalem (Israel)
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In this work we study thermodynamic manifestations of the quantum criticality in multiband unconventional superconductors. As a guiding example we consider the scenario of magnetic quantum critical point in the model that captures superconductivity coexistence with the spin-density wave. We show that in situations when the superconducting order parameter has incidental nodes at isolated points, quantum magnetic fluctuations lead to the renormalization of the relative 𝑇-linear slope of the London penetration depth. This leads to the nonmonotonic dependence of the penetration depth as a function of doping and the concomitant peak structure across the quantum critical point. In addition, we determine contribution of magnetic fluctuations to the specific heat at the onset of the coexistence phase. Furthermore, our theoretical analysis is corroborated by making a comparison of our results with the recent experimental data from the low-temperature thermodynamic measurements at optimal composition in BaFe2(As1-xPx)2.

Research Organization:
University of Wisconsin, Madison, WI (United States); University of Wisconsin–Madison, WI (United States)
Sponsoring Organization:
Israel Science Foundation (ISF); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0020313
OSTI ID:
3015779
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 105; ISSN 2469-9950; ISSN 2469-9969
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Finite temperature field theory
Iron-based superconductors
Multiband superconductivity
Quantum phase transitions
Superfluid density
finite temperature field theory
iron-based superconductors
multiband superconductivity
quantum phase transitions
superfluid density