X. L. Dong, P. H. Hor, F. Zhou, Z. X. Zhao
We propose a new magnetic phase diagram of La2-xSrxCuO4 around a quantum
critical point x = 1/9 based on field-cooled magnetization measurements and
critical fittings. A new phase boundary Tm2(H) is discovered which buries
deeply below the first order vortex melting line in the vortex solid phase. The
coupling between superconductivity and antiferromagnetism is found to be
attractive below Tm2(H) while repulsive above. The attractive coupling between
superconducting order and static antiferromagnetic order provides compelling
experimental evidence that the antiferromagnetism microscopically coexists and
collaborates with the high temperature superconductivity in cuprates.
View original:
http://arxiv.org/abs/1202.5359
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