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The investigation of high-temperature superconductors under high magneticfields is one of the most important topics in condensed matter physics. ForYBa$_2$Cu$_3$O$_7$ (YBCO), the measurements of magnetoresistance under a highmagnetic field are technically challenging because the required magnetic field($B$) is 100 T class. The low temperature (from 52 to 150 K) magnetoresistanceis measured in optimally-doped YBCO thin films under the condition$B$$\parallel$CuO$_2$-plane up to 103 T by employing the single-turn coiltechnique and a radio frequency reflection method. The electrical resistivity$\rho$ exhibits $B$-linear behavior in the normal phase in the high magneticfield region. The field slope coefficient $\beta$ (=$d\rho/dB$) becomesconverged at low temperatures. The convergency of $\beta$ below $T_c$ indicatesthe field-induced strange metal phase, which is determined by the quantumcritical fluctuation at high magnetic fields. The $\beta$ value differenceunder the different directions of the magnetic field suggests the stronganisotropy in quantum critical fluctuations in the strange metal phase of YBCO.

Magnetic Anisotropy of Quantum Critical Fluctuation in YBa$_2$Cu$_3$O$_7$ at High Magnetic Fields of up to 100 T