Soft phonons reveal the nematic correlation length in Ba(Fe0.94Co0.06)2As2

Autor:	D. Parshall, M. Kauth, Lothar Pintschovius, Michael Schütt, Frank Weber, Michael Merz, John-Paul Castellan, Joerg Schmalian, Dmitry Reznik, Th. Wolf, Rafael M. Fernandes
Rok vydání:	2018
Předmět:	Condensed Matter::Soft Condensed Matter Superconductivity Physics Condensed matter physics Phonon Liquid crystal Condensed Matter::Superconductivity 0103 physical sciences Doping Connection (algebraic framework) 010306 general physics 01 natural sciences 010305 fluids & plasmas
Zdroj:	Physical Review B. 98
ISSN:	2469-9969 2469-9950
Popis:	Nematicity is ubiquitous in electronic phases of high-${T}_{\mathrm{c}}$ superconductors, particularly in the Fe-based systems. While several experiments have probed nematic fluctuations, they have been restricted to uniform or momentum-averaged fluctuations. Here, we investigate the behavior of finite-momentum nematic fluctuations by utilizing the anomalous softening of acoustic phonon modes in optimally doped $\mathrm{Ba}{({\mathrm{Fe}}_{0.94}{\mathrm{Co}}_{0.06})}_{2}{\mathrm{As}}_{2}$. We determine the nematic correlation length and find that it sharply changes its $T$ dependence at ${T}_{\mathrm{c}}$, revealing a strong connection between nematicity and superconductivity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b24e2063080de38ffa4987a3bc3dca56 https://doi.org/10.1103/physrevb.98.014516 Zobrazit plný text záznamu