Resistance and magnetoresistance anomaly in a new stable organic metal (ET)2TlHg(SCN)4

Kushch, N.D.; Buravov, L. I.; Kartsovnik, M.V.; Laukhin, V. N.; Pesotskiǐ, S. I.; Shibaeva, R. P.; Rozenberg, L. P.; Yagubskii, Eduard B.; Zvarikina, A.V.

doi:10.1016/0379-6779(92)90352-j

Cited by 74 publications

(26 citation statements)

References 9 publications

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“…The Fermi surface is composed of both a two-dimensional ͑2D͒ cylinder and a pair of one-dimensional ͑1D͒ sheets as predicted by the tight-binding band structure calculation. 1,2 Among them ␣-͑BEDT-TTF͒ 2 M Hg͑SCN͒ 4 (M ϭK,Rb,Tl) shows a transition to density-wave ͑DW͒ states at about 10 K. [3][4][5] The temperature dependence of the resistivity of these compounds shows a steplike anomaly at the transition temperature T DW , and the angle-dependent magnetoresistance oscillation ͑AMRO͒ pattern dramatically changes below T DW , suggesting the reconstruction of the Fermi surface. 6 It is generally considered that this transition originates in the nesting instability of the one-dimensional part of the Fermi surface.…”

Section: Introductionmentioning

confidence: 99%

Control of electronic properties ofα−(BEDT−TTF)
Maesato
¹
,
Kaga
²
,
Kondo
³

et al. 2001
Phys. Rev. B
55
2
44
0
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Systematic uniaxial strain studies of ␣-͑BEDT-TTF͒ 2 M Hg͑SCN͒ 4 (M ϭK,NH 4 ͒ have been carried out. By controlling the in-plane lattice parameters a and c independently, we find that both compounds have essentially the same phase diagram in electronic properties, although, under the hydrostatic pressures, they show quite different phase diagrams. The K salt shows the superconductivity like NH 4 salt under the c-axis uniaxial strain, and the latter undergoes a transition to the density-wave state like the former under the a-axis uniaxial strain. These changes in electronic structures are verified by measuring the angle-dependent magnetoresistance. The electronic properties of these compounds can be systematically understood as a function of c/a, the ratio of the in-plane lattice parameters.

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Section: Introductionmentioning

confidence: 99%

Control of electronic properties ofα−(BEDT−TTF)
Maesato
¹
,
Kaga
²
,
Kondo
³

et al. 2001
Phys. Rev. B
55
2
44
0
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“…In this Letter, the magnetic susceptibility of single crystals of a-(BEDT-TTF) 2 TlHg(SCN) 4 of volume ϳ1.5 3 1.5 3 0.08 mm 3 [14] has been measured in pulsed magnetic fields of up to 50 T; the same inductive techniques have recently been used to study the dHvA effect in a-(BEDT-TTF) 2 KHg(SCN) 4 [15]. When subjected to a changing magnetic field B͑t͒, the magnetic moment m of a sample induces the voltage y l ≠B ≠t ≠m ≠B (1) in the detection coil.…”

mentioning

confidence: 99%

Quantized Hall Currents in the High Field Phase ofα−(BEDT−TTF)2TlHg(SCN)4
Harrison
¹
,
House
²
,
Kartsovnik
³

et al. 1996
Phys. Rev. Lett.
39
8
38
1
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Magnetization measurements performed on the charge-transfer salt a-(BEDT-TTF) 2 TlHg(NCS) 4 in pulsed magnetic fields reveal the existence of eddy current "resonances" in the high field state, indicating the presence of deep minima in the transverse magnetoresistivity. Their behavior can be explained qualitatively in terms of enhanced conductivity due to the quantum Hall effect.[ S0031-9007(96)00960-X] PACS numbers: 73.40.Hm, 73.61.PhSince the discovery of the quantum Hall (QH) effect, accompanied by zero transverse resistivity (r xx 0), in semiconductor-based two-dimensional electron (2DE) systems [1,2], there has been speculation over the possibility of observing such effects in bulk crystalline metals [3,4]. Thus far, the Bechgaard salts are the only bulk crystalline materials which have displayed a QH-like effect [5], albeit involving a very different mechanism. However, charge-transfer salts of the ion BEDT-TTF have recently emerged as a class of materials with quasi-twodimensional (Q2D) Fermi surfaces which satisfy the conditions required for conventional QH; i.e., the width W of the electronic band(s) in the longitudinal z direction and the broadening of the Landau levels (ht 21 ) are both significantly less than the separation between the Landau levels (hv c ) at magnetic fields B * 30 T. This seems to be especially true for salts of the form a-(BEDT-TTF) 2 MHg(SCN) 4 (M NH 4 , K, or Tl) [6]. One complication of these materials is the additional presence of quasi-one-dimensional (Q1D) states [7]. However, as will be seen below, the Q1D states provide a mechanism whereby the chemical potential m can be pinned between the Landau levels [6] thus providing a second prerequisite for the QH effect [2].A direct observation of the QH effect in BEDT-TTF salts requires the measurement of the transverse magnetoresistivities r xx and r xy at B * 30 T. Such experiments are problematic; first, the nonideal geometry of the single-crystal BEDT-TTF salt samples makes accurate determinations of r xx and r xy difficult [8]. Furthermore, the requirement B * 30 T implies the use of pulsed magnetic fields [9]; the extremely low in-plane resistivities of the samples means that noise due to induced voltages (an inevitable part of pulsed field experiments) dominates the tiny resistive signals. Magnetoresistance measurements in pulsed fields are hence restricted to the higher resistance longitudinal direction (i.e., r zz ; the current flows parallel to the magnetic field) [10]. Thus, for purely practical reasons, no direct verification of the existence of the QH effect has yet been possible in BEDT-TTF salts. Magnetization measurements provide an alternative means by which currents within the conducting planes can be investigated. Deep minima in r xx due to the QH effect cause the induction of persistent eddy currents which contribute to the magnetization [11,12]. This leads to the superposition of eddy current "resonances" on top of the conventional de Haasvan Alphen (dHvA) magnetization wave form [12,13].In this Letter, the magn...

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“…Despite being isostructural and exhibiting almost identical band structure and Fermi surface, practically all of these salts show a different low-temperature behavior. For instance whereas the K͑S͒, Rb͑S͒, and Tl͑S͒ phases exhibit a resistivity anomaly at 8 K, 12 K, and 10 K, respectively, [13][14][15] the NH 4 ͑S͒ and Tl͑Se͒ salts do not. Among the two last salts, the first becomes superconducting at 1 K and ambient pressure 16 whereas the second stays metallic until very low temperatures and does not enter into a superconducting state.…”

Section: Introductionmentioning

confidence: 99%

Density-wave instability inα−(BEDT-TTF)2KHg(SCN)4
Foury-Leylekian
¹
,
Pouget
²
,
Lee
³

et al. 2010
Phys. Rev. B
27
3
34
0
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Resistance and magnetoresistance anomaly in a new stable organic metal (ET)2TlHg(SCN)4

Cited by 74 publications

References 9 publications

Control of electronic properties ofα−(BEDT−TTF)
Maesato
¹
,
Kaga
²
,
Kondo
³

et al. 2001
Phys. Rev. B
55
2
44
0
View full text Add to dashboard Cite

Control of electronic properties ofα−(BEDT−TTF)
Maesato
¹
,
Kaga
²
,
Kondo
³

et al. 2001
Phys. Rev. B
55
2
44
0
View full text Add to dashboard Cite

Quantized Hall Currents in the High Field Phase ofα−(BEDT−TTF)2TlHg(SCN)4
Harrison
¹
,
House
²
,
Kartsovnik
³

et al. 1996
Phys. Rev. Lett.
39
8
38
1
View full text Add to dashboard Cite

Density-wave instability inα−(BEDT-TTF)2KHg(SCN)4
Foury-Leylekian
¹
,
Pouget
²
,
Lee
³

et al. 2010
Phys. Rev. B
27
3
34
0
View full text Add to dashboard Cite

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Resistance and magnetoresistance anomaly in a new stable organic metal (ET)2TlHg(SCN)4

Cited by 74 publications

References 9 publications

Control of electronic properties ofα−(BEDT−TTF)Maesato1, Kaga2, Kondo3 et al. 2001Phys. Rev. B552440View full textAdd to dashboardCite

Control of electronic properties ofα−(BEDT−TTF)Maesato1, Kaga2, Kondo3 et al. 2001Phys. Rev. B552440View full textAdd to dashboardCite

Quantized Hall Currents in the High Field Phase ofα−(BEDT−TTF)2TlHg(SCN)4Harrison1, House2, Kartsovnik3 et al. 1996Phys. Rev. Lett.398381View full textAdd to dashboardCite

Density-wave instability inα−(BEDT-TTF)2KHg(SCN)4Foury-Leylekian1, Pouget2, Lee3 et al. 2010Phys. Rev. B273340View full textAdd to dashboardCite

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Control of electronic properties ofα−(BEDT−TTF)
Maesato
¹
,
Kaga
²
,
Kondo
³

et al. 2001
Phys. Rev. B
55
2
44
0
View full text Add to dashboard Cite

Control of electronic properties ofα−(BEDT−TTF)
Maesato
¹
,
Kaga
²
,
Kondo
³

et al. 2001
Phys. Rev. B
55
2
44
0
View full text Add to dashboard Cite

Quantized Hall Currents in the High Field Phase ofα−(BEDT−TTF)2TlHg(SCN)4
Harrison
¹
,
House
²
,
Kartsovnik
³

et al. 1996
Phys. Rev. Lett.
39
8
38
1
View full text Add to dashboard Cite

Density-wave instability inα−(BEDT-TTF)2KHg(SCN)4
Foury-Leylekian
¹
,
Pouget
²
,
Lee
³

et al. 2010
Phys. Rev. B
27
3
34
0
View full text Add to dashboard Cite