Intertwined spin-orbital coupled orders in the iron-based superconductors
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Intertwined spin-orbital coupled orders in the iron-based superconductors. / Christensen, Morten H.; Kang, Jian; Fernandes, Rafael M.
In: Physical Review B, Vol. 100, No. 1, 014512, 15.07.2019.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Intertwined spin-orbital coupled orders in the iron-based superconductors
AU - Christensen, Morten H.
AU - Kang, Jian
AU - Fernandes, Rafael M.
N1 - Publisher Copyright: © 2019 American Physical Society.
PY - 2019/7/15
Y1 - 2019/7/15
N2 - The underdoped phase diagram of the iron-based superconductors exemplifies the complexity common to many correlated materials. Indeed, multiple ordered states that break different symmetries but display comparable transition temperatures are present. Here we argue that such a complexity can be understood within a simple unifying framework. This framework, built to respect the symmetries of the nonsymmorphic space group of the FeAs/Se layer, consists of primary magnetically ordered states and their vestigial phases that intertwine spin and orbital degrees of freedom. All vestigial phases have Ising-like and zero wave-vector order parameters, described in terms of composite spin order and exotic orbital-order patterns such as spin-orbital loop currents, staggered atomic spin-orbit coupling, and emergent Rashba- and Dresselhaus-type spin-orbit interactions. Moreover, they host unusual phenomena, such as the electronematic effect, by which electric fields act as transverse fields to the nematic order parameter, and the ferro-Néel effect, by which a uniform magnetic field induces Néel order. We discuss the experimental implications of our findings to iron-based superconductors and possible extensions to other correlated compounds with similar space groups.
AB - The underdoped phase diagram of the iron-based superconductors exemplifies the complexity common to many correlated materials. Indeed, multiple ordered states that break different symmetries but display comparable transition temperatures are present. Here we argue that such a complexity can be understood within a simple unifying framework. This framework, built to respect the symmetries of the nonsymmorphic space group of the FeAs/Se layer, consists of primary magnetically ordered states and their vestigial phases that intertwine spin and orbital degrees of freedom. All vestigial phases have Ising-like and zero wave-vector order parameters, described in terms of composite spin order and exotic orbital-order patterns such as spin-orbital loop currents, staggered atomic spin-orbit coupling, and emergent Rashba- and Dresselhaus-type spin-orbit interactions. Moreover, they host unusual phenomena, such as the electronematic effect, by which electric fields act as transverse fields to the nematic order parameter, and the ferro-Néel effect, by which a uniform magnetic field induces Néel order. We discuss the experimental implications of our findings to iron-based superconductors and possible extensions to other correlated compounds with similar space groups.
UR - http://www.scopus.com/inward/record.url?scp=85073654805&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.100.014512
DO - 10.1103/PhysRevB.100.014512
M3 - Journal article
AN - SCOPUS:85073654805
VL - 100
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 1
M1 - 014512
ER -
ID: 398068412