TY - JOUR
T1 - Calculated magnetic exchange interactions in high-temperature superconductors
AU - Wan, Xiangang
AU - Maier, Thomas A.
AU - Savrasov, Sergej Y.
PY - 2009/4/17
Y1 - 2009/4/17
N2 - Using a first-principles linear-response approach, we study the magnetic exchange interactions J for a series of superconducting cuprates. We reproduce the observed spin-wave dispersions together with other experimental trends, and show that different cuprates have similar J′ s regardless of their Tc. The nearest-neighbor J is not sensitive to the hole doping, which agrees with recent experiments. For the undoped cuprates, the second-nearest-neighbor J is ferromagnetic, but changes its sign with hole doping. We also find that, in contrast to the hopping integral, the exchange interaction is not sensitive to the position of apical oxygen. To see the effect of the long-range nature of the exchange on the superconducting Tc, we study the dynamical spin susceptibility χ (q,ω) within the t-J model using a dynamical cluster approximation.
AB - Using a first-principles linear-response approach, we study the magnetic exchange interactions J for a series of superconducting cuprates. We reproduce the observed spin-wave dispersions together with other experimental trends, and show that different cuprates have similar J′ s regardless of their Tc. The nearest-neighbor J is not sensitive to the hole doping, which agrees with recent experiments. For the undoped cuprates, the second-nearest-neighbor J is ferromagnetic, but changes its sign with hole doping. We also find that, in contrast to the hopping integral, the exchange interaction is not sensitive to the position of apical oxygen. To see the effect of the long-range nature of the exchange on the superconducting Tc, we study the dynamical spin susceptibility χ (q,ω) within the t-J model using a dynamical cluster approximation.
UR - http://www.scopus.com/inward/record.url?scp=67650289729&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.79.155114
DO - 10.1103/PhysRevB.79.155114
M3 - Article
AN - SCOPUS:67650289729
SN - 1098-0121
VL - 79
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 15
M1 - 155114
ER -