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Context. In September 2022, the transient neutron star low-mass X-ray binaryXTE J1701-462 went into a new outburst. Aims. The objective of this work is toexamine the evolution of the accretion geometry of XTE J1701-462 by studyingthe spectro-polarimetric properties along the Z track of this source. Thesimultaneous observations archived by the Insight-Hard X-ray ModulationTelescope (HXMT) and the Imaging X-ray Polarimetry Explorer (IXPE) give us theopportunity. Methods. We present a comprehensive X-ray spectro-polarimetricanalysis of XTE J1701-462, using simultaneous observations from IXPE,Insight-HXMT and NuSTAR. For IXPE observations, two methods are employed tomeasure the polarization: a model-independent measurement with PCUBE and amodel-dependent polarization-spectral analysis with XSPEC. The correspondingspectra from Insight-HXMT and NuSTAR are studied with two configurations thatcorrespond to a slab-like corona and a spherical shell-like corona,respectively. Results. Significant polarization characteristics are detected inXTE J1701-462. The polarization degree shows a decreasing trend along the Ztrack, reducing from (4.84 $\pm$ 0.37)% to (3.76 $\pm$ 0.43)% on the horizontalbranch and jumping to less than 1% on the normal branch. The simultaneousspectral analysis from Insight-HXMT and NuSTAR suggests that the redistributionbetween the thermal and Comptonized emission could be the reason for the PDevolution along the Z track. Based on the correlated spectro-polarimetricproperties, we propose that this source likely has a slab coronal geometry andthe size/thickness of the corona decreases along the Z track.

Correlated spectro-polarimetric study along the Z track in XTE J1701-462 puts constraints on its coronal geometry