Origin of the anomalously low Raman exponents in single molecule magnets

Gu, Lei; Wu, Ruqian

doi:10.1103/physrevb.103.014401

Origin of the anomalously low Raman exponents in single molecule magnets

Journal Article · Mon Jan 04 00:00:00 EST 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.103.014401· OSTI ID:1853286

Gu, Lei ^[1]; ^[2]

Univ. of California, Irvine, CA (United States); OSTI
Univ. of California, Irvine, CA (United States)

The Raman exponent of single molecular magnetic relaxation may take various unexpected values because of rich phonon spectra and spin-phonon coupling of molecular crystals. Here, we systematically examine the origins of different abnormalities and clarify misunderstandings of the past, particularly the appropriateness of the fitting procedures for the exponents. We find that exponential laws raised by optical phonons can yield spurious power laws with low exponents. This observation indicates long-standing misunderstandings of the origins of low Raman exponents in a large bulk of single molecule magnets. Resulting from spin-lattice coupling with optical modes, the presence of these exponents suggests the importance of the local dynamical environment for the magnetic relaxation in this regime.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0019448

OSTI ID:: 1853286

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 1 Vol. 103; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Origin of the anomalously low Raman exponents in single molecule magnets

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