The metal-insulator transition in the organic quasi-two-dimensional metal K-(BEDTTTF)(2)Hg(SCN)(2) Br at T-MI approximate to 90 K has been investigated. The crystal structure changes during this transition from monoclinic above T MI to triclinic below T-MI. A theoretical study suggested that this phase transition should be of the metal-to-metal type and brings about a substantial change of the Fermi surface. Apparently, the electronic system in the triclinic phase is unstable toward a Mott insulating state, leading to the growth of the resistance when the temperature drops below T-MI approximate to 90 K. The application of external pressure suppresses the Mott transition and restores the metallic electronic structure of the triclinic phase. The observed quantum oscillations of the magnetoresistance are in good agreement with the calculated Fermi surface for the triclinic phase, providing a plausible explanation for the puzzling behavior of K-(BEDT-TTF)(2)Hg(SCN)(2) Br as a function of temperature and pressure around 100 K. The present study points out interesting differences in the structural and physical behaviors of the two room temperature isostructural salts of K-(BEDT-TTF)(2)Hg(SCN)(2)X with X = Br, Cl.
机构:
Natl Sci Fdn, Div Mat Res, Alexandria, VA 22314 USA
Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USAJohns Hopkins Univ, Inst Quantum Matter, Baltimore, MD 21218 USA
机构:
Florida State Univ, Condensed Matter Sci, Natl High Magnet Field Lab, Tallahassee, FL 32310 USAUniv Stuttgart, Phys Inst 1, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Henderson, A.
Siegrist, T.
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Florida State Univ, Condensed Matter Sci, Natl High Magnet Field Lab, Tallahassee, FL 32310 USAUniv Stuttgart, Phys Inst 1, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Siegrist, T.
Schlueter, J. A.
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Natl Sci Fdn, Div Mat Res, Alexandria, VA 22314 USA
Argonne Natl Lab, Mat Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USAUniv Stuttgart, Phys Inst 1, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
机构:
Inst Fiziku, POB 304, HR-10001 Zagreb, CroatiaUniv Stuttgart, Phys Inst, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Culo, Matija
Tomic, Silvia
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Inst Fiziku, POB 304, HR-10001 Zagreb, CroatiaUniv Stuttgart, Phys Inst, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Tomic, Silvia
Schlueter, John A.
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Natl Sci Fdn, Div Mat Res, Arlington, VA 22230 USA
Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USAUniv Stuttgart, Phys Inst, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
机构:
Natl Sci Fdn, Div Mat Res, Alexandria, VA 22314 USA
Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USAJohns Hopkins Univ, Inst Quantum Matter, Baltimore, MD 21218 USA
机构:
Florida State Univ, Condensed Matter Sci, Natl High Magnet Field Lab, Tallahassee, FL 32310 USAUniv Stuttgart, Phys Inst 1, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Henderson, A.
Siegrist, T.
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h-index: 0
机构:
Florida State Univ, Condensed Matter Sci, Natl High Magnet Field Lab, Tallahassee, FL 32310 USAUniv Stuttgart, Phys Inst 1, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Siegrist, T.
Schlueter, J. A.
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h-index: 0
机构:
Natl Sci Fdn, Div Mat Res, Alexandria, VA 22314 USA
Argonne Natl Lab, Mat Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USAUniv Stuttgart, Phys Inst 1, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
机构:
Inst Fiziku, POB 304, HR-10001 Zagreb, CroatiaUniv Stuttgart, Phys Inst, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Culo, Matija
Tomic, Silvia
论文数: 0引用数: 0
h-index: 0
机构:
Inst Fiziku, POB 304, HR-10001 Zagreb, CroatiaUniv Stuttgart, Phys Inst, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Tomic, Silvia
Schlueter, John A.
论文数: 0引用数: 0
h-index: 0
机构:
Natl Sci Fdn, Div Mat Res, Arlington, VA 22230 USA
Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USAUniv Stuttgart, Phys Inst, Pfaffenwaldring 57, D-70550 Stuttgart, Germany