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We present thermoelectric power (TEP) studies under pressure and highmagnetic field in the antiferromagnet CeRh2Si2 at low temperature. Undermagnetic field, large quantum oscillations are observed in the TEP, S(H), inthe antiferromagnetic phase. They suddenly disappear when entering in thepolarized paramagnetic (PPM) state at Hc pointing out an importantreconstruction of the Fermi surface (FS). Under pressure, S/T increasesstrongly of at low temperature near the critical pressure Pc, where the AForder is suppressed, implying the interplay of a FS change and low energyexcitations driven by spin and valence fluctuations. The difference between theTEP signal in the PPM state above Hc and in the paramagnetic state (PM) abovePc can be explained by different FS. Band structure calculations at P = 0stress that in the AF phase the 4f contribution at the Fermi level (EF) is weakwhile it is the main contribution in the PM domain. By analogy to previous workon CeRu2Si2, in the PPM phase of CeRh2Si2 the 4f contribution at EF will drop.

Fermi surface instabilities in CeRh2Si2 at high magnetic field and pressure