NMR analysis probe, comprising: - a frame; - a sample-holder comprising a rotor, suitable for receiving a sample of material to be analysed; - a bearing for rotationally guiding the sample-holder relative to the frame; - a turbine kinematically linked with the rotor, the turbine having a geometry such that it allows: - an expansion of a third gaseous flow M3 which passes through it in which the isentropic efficiency relative to a purely isentropic expansion is greater than 70%, and - a lowering of the temperature of the third gaseous flows M3 which passes through it, the probe comprising in addition: - a first element for channelling a first gaseous flow M1 of high-pressure fluid to the sample-holder, the function of this flow being to cool the sample-holder and/or the sample, - a second element for channelling a second gaseous flow M2 of high-pressure fluid to the bearing, - a third element for channelling a third gaseous flow M3 of high-pressure fluid to the turbine, - a fourth element for channelling a fourth gaseous flow M4 of low-pressure fluid, resulting from the gaseous flow M3 having rotated the sample-holder, said forth element for channelling being placed downstream of the expansion turbine, and - a sixth element for channelling a sixth gaseous flow M6 of low-pressure fluid downstream of the rotor and stator of the sample-holder, the sixth gaseous flow M6 being formed by the forth low-pressure gaseous flow M4 and a fith low-pressure gaseous flow M5 corresponding to the gaseous flows resulting from the first gaseous flow M1, and the second gaseous flow M2 having brought the sample to a certain temperature and created said bearing. - a frame; - a sample-holder comprising a rotor, suitable for receiving a sample of material to be analysed; - a bearing for rotationally guiding the sample-holder relative to the frame; - a turbine kinematically linked with the rotor, the turbine having a geometry such that it allows: - an expansion of a third gaseous flow M3 which passes through it in which the isentropic efficiency relative to a purely isentropic expansion is greater than 70%, and - a lowering of the temperature of the third gaseous flows M3 which passes through it, - an expansion of a third gaseous flow M3 which passes through it in which the isentropic efficiency relative to a purely isentropic expansion is greater than 70%, and - a lowering of the temperature of the third gaseous flows M3 which passes through it, - a first element for channelling a first gaseous flow M1 of high-pressure fluid to the sample-holder, the function of this flow being to cool the sample-holder and/or the sample, - a second element for channelling a second gaseous flow M2 of high-pressure fluid to the bearing, - a third element for channelling a third gaseous flow M3 of high-pressure fluid to the turbine, - a fourth element for channelling a fourth gaseous flow M4 of low-pressure fluid, resulting from the gaseous flow M3 having rotated the sample-holder, said forth element for channelling being placed downstream of the expansion turbine, and - a sixth element for channelling a sixth gaseous flow M6 of low-pressure fluid downstream of the rotor and stator of the sample-holder, the sixth gaseous flow M6 being formed by the forth low-pressure gaseous flow M4 and a fith low-pressure gaseous flow M5 corresponding to the gaseous flows resulting from the first gaseous flow M1, and the second gaseous flow M2 having brought the sample to a certain temperature and created said bearing.