Nonanalytical magnetoresistance, the third angular effect, and a method to investigate Fermi surfaces in quasi-two-dimensional conductors
- Electrotechnical Laboratory, 1-1-4 Umezono 350, Tsukuba (Japan)
- Institute for Materials Research, Tohoku University, Sendai 980 (Japan)
We demonstrate that transverse magnetoresistance is a nonanalytical function of the magnetic field, {rho}{sub {perpendicular}}(H){approximately}{vert_bar}H{vert_bar}{sup 1/2}, if a magnetic field is parallel to the plane of anisotropy and normal to the Fermi surface at an inflection point in a quasi-two-dimensional (Q2D) conductor. The so-called {open_quotes}third angular effect,{close_quotes} recently discovered in organic conductors (TMTSF){sub 2}X (X=ClO{sub 4},PF{sub 6}) and (DMET){sub 2}I{sub 3}, is interpreted in terms of the existence of an inflection point on their Fermi surfaces. Nonanalytical magnetoresistance is predicted to appear when the magnetic field is applied at the {open_quotes}third magic angles,{close_quotes} {Theta}={plus_minus}{Theta}{sub c}. It is also shown that at arbitrary directions of the in-plane magnetic field the magnetoresistance does not depend on relaxation time and obeys the law {rho}{sub {perpendicular}}(H){approximately}A{vert_bar}H{vert_bar} with factor A being a function of local characteristics of a Q2D Fermi surface. The above-mentioned phenomena provide useful methods to investigate Fermi surfaces in strongly anisotropic Q2D conductors including organic and high-T{sub c} superconductors. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 490189
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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