Asia Pacific Center for Theoretical Physics, Hogil Kim Memorial building 5th floor, POSTECH, Hyoja-dong, Namgu, Pohang 790-784, Korea.
Phys Rev Lett. 2010 Apr 16;104(15):156403. doi: 10.1103/PhysRevLett.104.156403. Epub 2010 Apr 15.
We find that the Kondo effect results in a new universality class for an antiferromagnetic (AF) quantum critical point (QCP) in the heavy fermion quantum transition, described by deconfined bosonic spinons with the dynamical exponent z=3. We show that the thermodynamics and transport of the z=3 AF QCP are consistent with the well-known non-Fermi liquid physics such as the divergent Grüneisen ratio with an exponent 2/3 and temperature-linear resistivity. We propose that the hallmark of the Kondo-driven AF QCP is a uniform spin susceptibility that diverges with an exponent 2/3, remarkably consistent with the experimental observations for YbRh2Si2.
我们发现，在重费米子量子相变中，由于康登效应，反铁磁（AF）量子临界点（QCP）出现了一个新的普适类，该相变由离域玻色自旋子描述，动力学指数 z=3。我们表明，z=3 的 AF QCP 的热力学和输运性质与众所周知的非费米液体物理一致，例如格林艾森比的发散指数为 2/3 和温度线性电阻率。我们提出，康登驱动的 AF QCP 的标志是自旋磁化率的均匀发散，其发散指数为 2/3，这与 YbRh2Si2 的实验观测结果非常一致。
