TY - JOUR
T1 - Simultaneous thermodynamic and transport measurements of the field-induced spin-density-wave transitions in (TMTSF)2ClO4
AU - Scheven, U. M.
AU - Chashechkina, E. I.
AU - Lee, E.
AU - Chaikin, P. M.
PY - 1995
Y1 - 1995
N2 - The standard model for the field-induced spin-density-wave (FISDW) transitions in the Bechgaard salts (TMTSF)2X, where TMTSF is tetramethyltetraselenafulvalene, explains a cascade of phase trasitions with each phase associated with the quantum Hall effect. The ClO4 salt is sufficiently different that it has inspired a series of theoretical modifications from the standard model. To test these models we have performed simultaneous xx, xy, specific-heat, magnetocaloric effect, and magnetization measurements in the field range from 09 T. We find that all of the transport transitions, specifically the Hall resistance jumps, are associated with thermodynamic transitions. We observe the emergence of a new FISDW state characterized by a distinct Hall plateau. It arises from what was originally believed to be a tetracritical point in the phase diagram. We find no evidence for an arborescent phase diagram, but rather the signature of a single pairwise splitting of the phase boundaries. The higher-field transitions are decidedly first order, hysteretic, and lossy. Anion disorder decreases the number of observed phases and shifts the transition fields.
AB - The standard model for the field-induced spin-density-wave (FISDW) transitions in the Bechgaard salts (TMTSF)2X, where TMTSF is tetramethyltetraselenafulvalene, explains a cascade of phase trasitions with each phase associated with the quantum Hall effect. The ClO4 salt is sufficiently different that it has inspired a series of theoretical modifications from the standard model. To test these models we have performed simultaneous xx, xy, specific-heat, magnetocaloric effect, and magnetization measurements in the field range from 09 T. We find that all of the transport transitions, specifically the Hall resistance jumps, are associated with thermodynamic transitions. We observe the emergence of a new FISDW state characterized by a distinct Hall plateau. It arises from what was originally believed to be a tetracritical point in the phase diagram. We find no evidence for an arborescent phase diagram, but rather the signature of a single pairwise splitting of the phase boundaries. The higher-field transitions are decidedly first order, hysteretic, and lossy. Anion disorder decreases the number of observed phases and shifts the transition fields.
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U2 - 10.1103/PhysRevB.52.3484
DO - 10.1103/PhysRevB.52.3484
M3 - Article
AN - SCOPUS:0013412012
SN - 0163-1829
VL - 52
SP - 3484
EP - 3492
JO - Physical Review B
JF - Physical Review B
IS - 5
ER -