Quantum oscillations of magnetoresistance in a new organic superconductor (BEDT-TTF)2(NH4)Hg(SCN)4

Osada, Toshiko; Kawasumi, A.; Yagi, Ryuta; Kogoshima, S.; Miura, N.; Oshima, M.; Mori, H.; Nakamura, Toshikazu; Saito, Gunzi

doi:10.1016/0038-1098(90)90407-3

Cited by 46 publications

(15 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[14]. The minimal frequency in a-(ET) 2 (NH 4 )-Hg(SCN) 4 is Fo =566.7 ±1 T in good agreement with the recently reported value of 1/F 0 =0.0018 T _1 (no error stated) [13]. Up to the highest measured angles, no detectable deviation from the 1/cos© behavior is found.…”

supporting

confidence: 90%

“…By use of a g factor near 2, as measured in ESR experiments, we resolve the measured effective mass into band and electron-phonon contributions, and quantitatively explain the observed dHvA amplitudes as a function of angle. Although several Shubnikov-de Haas (SdH) studies have been reported for these crystals [2,4,5,[11][12][13], there is only one dHvA study previously reported [14].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Angular dependence of the cyclotron effective mass in organic superconductors

et al. 1991

View full text Add to dashboard Cite

We report measurements of the de Haas-van Alphen (dHvA) effect in the organic superconductors a-(BEDT-TTF) 2 (NH 4 )Hg(SCN) 4 (T c ~ 1 K) and K-(BEDT-TTF) 2 CU(NCS) 2 (7V«10 K) in fields up to 15 T and temperatures down to 0.45 K. For the first time, we determine the angular dependence of the cyclotron effective mass m c , and the orientation of up to four spin-splitting zeros of the dHvA signal. The angular dependence of the amplitude of the dHvA oscillations is quantitatively explained, and the mass enhancement due to electron-phonon coupling is estimated.

show abstract

supporting

confidence: 90%

mentioning

confidence: 99%

Angular dependence of the cyclotron effective mass in organic superconductors

et al. 1991

View full text Add to dashboard Cite

show abstract

“…30b-30d are inconsistent with the 2D conducting behavior, partial nesting of the Fermi surface, and reconstruction of the Fermi surface at low temperatures (see section 3.5.6). The coexistence of the 2D and 1D Fermi surfaces was confirmed by the Fermi surface topology (Fermiology) [361][362][363][364] and is in good agreement with Figs. 30a and 30e.…”

supporting

confidence: 87%

“…67a), 586 which differs from those of the NH 4 salt. 587 AMRO of the K salt showed a drastic phase change at around 8 K. 588 Kartsovnik et al explained these behaviors in terms of the reconstruction of the Fermi surface through the nesting of the 1D Fermi part as seen in Figs. 67b and 67c.…”

Section: Symmetry Of Superconductivity;mentioning

confidence: 96%

Development of Conductive Organic Molecular Assemblies: Organic Metals, Superconductors, and Exotic Functional Materials

Saito¹,

Yoshida²

2007

Bulletin of the Chemical Society of Japan

370

127

View full text Add to dashboard Cite

show abstract

“…With thiS value of w" and assuming 2 holes from 4 BEDT-TTF ~olecules per unit cell (V = 2008 A3), one obtains an effective mass of 1.8 me, which is in good agreement with magnetic measurements (2.1 me) [18]. Figure 3 shows the detailed high-resolution vibrational spectra between 400 cm-1 and 1500 cm-1 of both the protonated and the deuterated compounds for Ella.…”

Section: Introductionsupporting

confidence: 70%

The infrared optical properties of the α-phase organic superconductor, α-(BEDT - TTF)2 (NH4Hg(NCS)4)

et al. 1993

View full text Add to dashboard Cite

The title compound is the only known organic superconductor (Tc = 0.8 K) with an a-phase crystal structure, in which the conducting plane contains single BEDT-TT F molecules with alternating orientation, rather than the pairs of molecules found in the higher Tc Ie-phase compounds. We have measured the polarized reflectivity of protonated and deuterated ., from 80 cm-1 to 8000 cm-l , at temperatures between 6.5 K and 300 K. The overall shape of these spectra are discussed. The optical conductivity obtained after a Kramers-Kronig analysis shows no maximum in the mid-infrared as known from the compounds of the Ie-phase due to the lack of dimerization of the BEDT-TTF molecules. This causes an accentuation of the far-infrared intraband conductivity. The vibrational features are assigned and discussed. INTRODUCTIONEven if the first popular BEDT-TTF (bia--(ethylenedithio) tetrathiafulvalene) radical ion salt was a- , no superconductivity in an a-phase crystal of this familiy was found. Various efforts to observe ambient pressure superconductivity in an a-phase BEDT-TTF salt like a-(BEDT-TTFhI 3 or related components a-(BEDT-TTFhAuI2 have failed: Doping of a-(BE-DT-TTFhI 3 ·with iodine does not cause a partial supression of the metal-insulator transition at 135 K and superconducting behaviour at T ~ 3 K as reported [2], but only gives a slight rise of the high-frequency conductivity in the insulating phase after extreme doping of several hours [3].

show abstract

Quantum oscillations of magnetoresistance in a new organic superconductor (BEDT-TTF)2(NH4)Hg(SCN)4

Cited by 46 publications

References 9 publications

Angular dependence of the cyclotron effective mass in organic superconductors

Angular dependence of the cyclotron effective mass in organic superconductors

Development of Conductive Organic Molecular Assemblies: Organic Metals, Superconductors, and Exotic Functional Materials

The infrared optical properties of the α-phase organic superconductor, α-(BEDT - TTF)2 (NH4Hg(NCS)4)

Contact Info

Product

Resources

About