Balakirev F F, Betts J B, Migliori A, Tsukada I, Ando Yoichi, Boebinger G S
National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Phys Rev Lett. 2009 Jan 9;102(1):017004. doi: 10.1103/PhysRevLett.102.017004. Epub 2009 Jan 7.
A 60 T magnetic field suppresses the superconducting transition temperature T_{c} in La_{2-p}Sr_{p}CuO_{4} to reveal a Hall number anomaly, which develops only at temperatures below zero-field T_{c} and peaks at the exact location of p that maximizes T_{c}. The anomaly bears a striking resemblance to observations in Bi_{2}Sr_{2-x}La_{x}CuO_{6+delta}, suggesting a normal-state phenomenology common to the cuprates that underlies the high-temperature superconducting phase. The peak is ascribed to a Fermi surface reconstruction at a quantum phase transition near optimum doping that is coincident with the collapse of the pseudogap state.
60特斯拉的磁场会抑制La₂₋ₚSrₚCuO₄中的超导转变温度Tc，从而揭示出一个霍尔数异常现象，该异常现象仅在低于零场Tc的温度下出现，并在使Tc最大化的精确p位置处达到峰值。这种异常现象与Bi₂Sr₂₋ₓLaₓCuO₆₊δ中的观测结果惊人地相似，这表明铜酸盐中存在一种共同的正常态现象学，它是高温超导相的基础。该峰值归因于接近最佳掺杂时量子相变处的费米面重构，这与赝能隙态的崩塌相吻合。
