We have performed photo‐induced “transient thermoelectric effect (TTE)” experiments for charge‐density‐wave (CDW) material 1T‐TaS2 single crystals in hexagonal and triclinic nearly commensurate phases up to 5 T. The TTE voltages decay with the characteristic relaxation times τ1, τ2, and τ3. τ1 and τ2 in the hexagonal phase oscillate with magnetic field B, while those in the triclinic phase are independent of B. The oscillatory phenomenon is interpreted by the Altshuler‐Aronov‐Spivak effect around the hexagonal arrays of commensurate CDW domains.
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