 The study synthesized CRO2 micro-rod powder by decomposing crow3 flakes at specific temperatures, resulting in magnetotransport properties measured using a direct current 4 probe method with CU slash crow2 rods slash colloidal silver liquid electrode sandwich device. The largest magnetoresistance of 72% was observed at 77K with an applied current of 0.05 muA, indicating tunneling type transport properties with a tunneling barrier height of around 2.2 plus or minus 0.04EV. X-ray photoemission spectroscopy revealed the mixing of CR oxides on the surface of CRO2 rod, providing a tunneling barrier rather than a single phase of CR203 insulating barrier. The magnetoresistance shows strong bias voltage dependence and is ascribed to the two-step tunneling process. This article was authored by Zhen Wang, Li Xi, Yi Kai Yang, and others. We are article.tv. Links in the description below.