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Spin and orbital magnetic moments of Re in AA'FeReO6 double perovskites (A,A'= Ba, Sr, Ca) have been directly probed employing XMCD spectroscopy at the ReL2,3-edges. A considerable orbital magnetic moment is observed in all thestudied compounds despite octahedral coordination. Relative orbital to spincontribution per Re atom rises with lattice distortion from mL/mS = -0.28 to-0.34 for AA'=Ba2FeReO6 and Ca2FeReO6, respectively. A preliminary XMCDmeasurements at the Fe L2,3-edges reveals also a significant orbital moment ofiron in Ca2FeReO6. The relation of the results to the magnetic properties ofthe compounds is discussed.Comment: 8 pages, 3 figures, 1 tabl

Evidence of unquenched Re orbital magnetic moment in AA′FeReO6 double perovskites