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Using the quasiclassical Green's function formalism, we study the influenceof the odd-frequency spin-triplet superconductivity on the local density ofstates (LDOS) in a diffusive ferromagnet (DF) attached to a superconductor.Various possible symmetry classes in a superconductor are considered which areconsistent with the Pauli's principle: even-frequency spin-singlet even-parity(ESE) state, even-frequency spin-triplet odd-parity (ETO) state, odd-frequencyspin-triplet even-parity (OTE) state and odd-frequency spin-singlet odd-parity(OSO) state. For each of these states, the pairing state in DF is studied.Particular attention is paid to the study of spin-singlet s-wave andspin-triplet p-wave superconductors as the examples of ESE and ETOsuperconductors. For spin-singlet case the magnitude of the OTE component ofthe pair amplitude is enhanced with the increase of the exchange field in DF.When the OTE component is dominant at low energy, the resulting LDOS in DF hasa zero energy peak (ZEP). On the other hand, in DF / spin-triplet p-wavesuperconductor junctions LDOS has a ZEP in the absence of the exchange field,where only the OTE paring state exists. With the increase of the exchangefield, the ESE component of the pair amplitude induced in DF is enhanced. Then,the resulting LDOS has a ZEP splitting. We demonstrate that the appearance ofthe dominant OTE component of the pair amplitude is the physical reason of theemergence of the ZEP of LDOS.Comment: 9 pages, 9 figure

Manifestation of the odd-frequency spin-triplet pairing state in diffusive ferromagnet/superconductor junctions