International Journal of Physics | Vol. 4, No. 2, February 2013 | pp. 9–16
DOI: 10.46882/2013/IJP/000034
Research Article
Title: Structural Evolution and Transport Anomalies in Iron-Based Pnictide Superconductors under Hydrostatic Pressure
Names of Authors: A. A. Menshikov¹, B. J. Holford²
Authors’ Affiliations: ¹Institute for Solid State Physics, Russian Academy of Sciences, Chernogolovka 142432, Russia; ²Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
Abstract: The interplay between structural transitions and high-temperature superconductivity in iron-based pnictides is a focal topic in modern condensed matter physics. This work details the structural evolution and electronic transport anomalies in Ba(Fe1-xCox)²As² single crystals under hydrostatic pressures up to 12.0 GPa. The experiments used a non-magnetic diamond anvil cell setup. At ambient pressure conditions, the parent material shows an structural transition from tetragonal to orthorhombic symmetry at Ts = 134 K. This change occurs alongside an antiferromagnetic spin-density-wave phase transition at TSDW = 132 K. Applying hydrostatic pressure systematically suppresses both transitions. The spin-density-wave state disappears completely at a critical pressure value of P = 4.2 GPa. Simultaneously, a superconducting dome emerges, reaching a maximum critical transition temperature of Tc = 24.8 K. Hall effect coefficients show a sudden sign reversal near the optimal pressure setting. This indicates a significant reconfiguration of the Fermi surface geometry and changes in carrier concentration levels. Our findings confirm that high-pressure conditions reconstruct the multi-band nesting parameters. This reconstruction enhances the spin-fluctuation pairing mechanisms responsible for high-temperature superconductivity.
Keywords: Superconductivity; pnictides; hydrostatic pressure; diamond anvil cell; spin-density wave; Fermi surface
Manuscript Timeline: Received: November 5, 2012; Revised: December 18, 2012; Accepted: January 8, 2013; Published: February 12, 2013
Citation: Menshikov, A. A., & Holford, B. J. (2013). Structural Evolution and Transport Anomalies in Iron-Based Pnictide Superconductors under Hydrostatic Pressure. International Journal of Physics, 4(2), 9–16.
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