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We present Herschel far-infrared (FIR) photometry of eleven quasars atredshift z>5 that have previously been detected at 1.2mm. We perform fullspectral energy distribution (SED) fits over the wavelength range lambda_rest~0.1-400mu for those objects with good Herschel detections. These fits revealthe need for an additional far-infrared (FIR) component besides the emissionfrom a dusty AGN-powered torus. This additional FIR component has temperaturesof T_FIR ~ 40-60K with luminosities of L_(8-1000mu) ~ 10^13 L_sun (accountingfor 25-60% of the bolometric FIR luminosity). If the FIR dust emission is dueto star formation it would suggest star formation rates in excess of 1000 solarmasses per year. We show that at long wavelengths (lambda_rest > 50mu) thecontribution of the AGN-powered torus emission is negligible. This explains howprevious FIR studies of high-redshift quasars that relied on single componentfits to (ground-based) observations at lambda_obs > 350mu reached T_FIR andL_FIR values similar to our complete SED fits. Stacking the Herschel data offour individually undetected sources reveals a significant average signal inthe PACS bands but not in SPIRE. The average SED of sources with individualHerschel detections shows a striking surplus in near- and mid-infrared emissionwhen compared to common AGN templates. The comparison between two average SEDs(sources with and without individual Herschel detections) matched in theUV/optical indicates that for these objects the strength of the MIR emissionmay correlate with the strength of the FIR emission.

Complete infrared spectral energy distributions of mm detected quasars at z>5