Fig. 5

OR experimental result: (a) Direct measurement of the sample’s \(\bar{\varepsilon }_{\text {em}}\) during the OR experiment. The green arrow indicates when the pump laser was unbocked after the fourth temperature mesurement. The red curve indicates when it was subsequently blocked. The cooling curve (blue) and the recovery curve (red) are calculated with the same \(\tau =180\) s.(b) Change in the \(\bar{\varepsilon }_{\text {em}}\) of the sample corresponding to an increase in the cryostat’s temperature after the 7th temperature measurement. The red curve is the fitting result of exponential decay with \(\tau _{\text {h}}=180\) s.