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  • Title: Large positive magnetoresistance of insulating organic crystals in the non-ohmic region.
    Author: Takahide Y, Konoike T, Enomoto K, Nishimura M, Terashima T, Uji S, Yamamoto HM.
    Journal: Phys Rev Lett; 2007 Mar 16; 98(11):116602. PubMed ID: 17501072.
    Abstract:
    We report a large positive magnetoresistance ratio in insulating organic crystals theta-(ET)(2)CsZn(SCN)(4) at low temperatures at which they exhibit highly nonlinear current-voltage characteristics. Despite the nonlinearity, the magnetoresistance ratio is independent of the applied voltage. The magnetoresistance ratio depends little on the magnetic field direction and is described by a simple universal function of mu(B)B/k(B)T, where mu(B) is the Bohr magneton. The positive magnetoresistance may be caused by magnetic-field-induced parallel alignment of spins of mobile and localized electrons, and a resulting blockade of electrical conduction due to the Pauli exclusion principle.
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