Transport and magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Tl</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="

Kubo, Yoshimi; Shimakawa, Yuichi; Manako, T.; Igarashi, H.

doi:10.1103/physrevb.43.7875

Cited by 247 publications

(111 citation statements)

References 16 publications

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“…On the other hand, the slope dρ ab /dT of the overdoped samples (x=0.30 and 0.24) monotonically decreases with decreasing temperature. This reflects the fact that ρ ab of the overdoped samples behaves as ρ ab =ρ 0 + AT n with n larger than 1, a behavior reported in the overdoped samples of LSCO [15] and Tl 2 Ba 2 CuO 6+δ (Tl-2201) [16]. The inset to Fig.…”

supporting

confidence: 54%

Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−x
Ando
¹
,
Murayama
²

1999
Phys. Rev. B
91
12
100
2
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In-plane resistivity, Hall coefficient, and magnetoresistance (MR) are measured in a series of highquality Bi2Sr2−xLaxCuO6 crystals with various carrier concentrations, from underdope to overdope. It is found that the temperature dependence of the Hall angle obeys a power law T α with α systematically decreasing with increasing doping, which questions the universality of the Fermi-liquid-like T 2 dependence of the "Hall scattering rate". The systematics of MR indicates an increasing role of spin scattering in underdoped samples.PACS numbers: 74.25. Fy, 74.62.Dh, 74.72.Hs The peculiar normal-state properties of high-T c cuprates are generally considered to be the keys to elucidate the high-T c mechanism, since they give us a clue to clarify the nature of the strongly-correlated electronic state of the cuprates. To understand the underlying electronic state of the cuprates, it is desirable to study the normal state at low temperatures [1] and to chase the systematic evolution thereof with carrier concentration [2]. Therefore, particularly useful system for the normalstate study is such a system where T c is relatively low and where the the carrier concentration can be changed in a wide range from underdope to overdope.A typical study in which a wide temperature window for the normal-state is desirable is the measurement of the temperature dependence of the scattering time. For example, the observation of the T -linear resistivity from 10 K to 700 K in Bi 2 Sr 2 CuO 6 (Bi-2201) [3] had a strong impact, because it clearly demonstrated the dominance of the electron-electron interaction in the scattering mechanism. In high-T c cuprates, it has been discussed that the charge transport is governed by two different scattering times with different temperature dependences [4][5][6]; according to this "two-scattering-time" model, in-plane resistivity ρ ab is governed by the transport scattering time τ tr (∼T −1 ) and the Hall angle θ H is governed by the "Hall scattering time" τ H (∼T −2 ). However, this idea of "scattering-time separation" has not yet gained a complete consensus and there are other approaches to understand the unusual normal-state transport properties [7,8]. Therefore, it would be useful to establish the temperature and doping range in which the T 2 behavior of the Hall scattering rate τ −1 H is observed. There are two widely-known cuprate systems which satisfy the requirements of the relatively low T c and the availability of a wide doping range; La 2−x Sr x CuO 4 (LSCO) system and Bi-2201 system. Bi-2201 has not been as intensively studied as LSCO, mostly because of the difficulty in obtaining high-quality single crystals. A number of problems have been known for Bi-2201 crystals: (a) the transport properties of B-2201 are quite non-reproducible even among crystals of nominally the same composition [9-11]; (b) the residual resistivity of the in-plane resistivity ρ ab is usually large (the smallest value reported to date is 70 µΩcm [3,11]), as opposed to LSCO, YBa 2 Cu 3 O 7 (YBCO), or Bi 2 Sr 2 CaCu 2...

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supporting

confidence: 54%

Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−x
Ando
¹
,
Murayama
²

1999
Phys. Rev. B
91
12
100
2
View full text Add to dashboard Cite

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“…Although this relation is complex [and sometimes violated (5)], we note that with large [Ϸ10 3 (17)] resistivity anisotropy in Tl 2 Ba 2 CuO 6ϩx , the obtained A values near H QCP imply enhanced ␥ ϳ 30 mJ/mol-K 2 , comparable with that, e.g., in superconducting Sr 2 RuO 4 (26), where similarly anisotropic A values between the c-axis and in-plane resistivities have been observed. This enhancement of A and a lack of saturation may also be related to the enhanced susceptibility 0 in the overdoped Tl 2 Ba 2 CuO 6ϩx (9). We surmise then that at finite temperatures the system is governed by the quantum fluctuations, generating the n-FL state that crosses over to the conventional FL above H FL .…”

Section: Resultsmentioning

confidence: 73%

Field-induced quantum critical route to a Fermi liquid in high-temperature superconductors

Shibauchi

Krusin‐Elbaum

Hasegawa

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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In high-transition-temperature (Tc) superconductivity, charge doping is a natural tuning parameter that takes copper oxides from the antiferromagnet to the superconducting region. In the metallic state above T c, the standard Landau's Fermi-liquid theory of metals as typified by the temperature squared (T 2 ) dependence of resistivity appears to break down. Whether the origin of the non-Fermiliquid behavior is related to physics specific to the cuprates is a fundamental question still under debate. We uncover a transformation from the non-Fermi-liquid state to a standard Fermi-liquid state driven not by doping but by magnetic field in the overdoped high-T c superconductor Tl2Ba2CuO6؉x. From the c-axis resistivity measured up to 45 T, we show that the Fermi-liquid features appear above a sufficiently high field that decreases linearly with temperature and lands at a quantum critical point near the superconductivity's upper critical field-with the Fermi-liquid coefficient of the T 2 dependence showing a power-law diverging behavior on the approach to the critical point. This field-induced quantum criticality bears a striking resemblance to that in quasi-two-dimensional heavy-Fermion superconductors, suggesting a common underlying spin-related physics in these superconductors with strong electron correlations.quantum criticality ͉ strongly correlated electron materials ͉ superconductivity Q uantum criticality refers to a phase transition process between competing states of matter governed not by thermal but by quantum fluctuations demanded by Heisenberg's uncertainty principle (1). It has emerged at the front and center of the physics of strongly correlated electron systems known to host competing quantum orders, and is witnessed by a proliferation of reports on heavy Fermions (2-5), itinerant (quantum) magnets (6), and hightransition-temperature (high-T c ) superconductors (7), with quantum matter tuned (at times arguably) through a transition by pressure, magnetic field, or doping-arguably because one has to rely on long shadows cast by quantum criticality far above zero temperature (8), for, obviously, T ϭ 0 K cannot ever be attained.The often-invoked hallmark of quantum criticality is an unconventional behavior of resistivity. For resistivity contribution, the standard Fermi liquid (FL) theory of metals predicts a quadratic temperature dependence (T) ϭ (0) ϩ AT 2 at low temperatures. In high-T c cuprates, however, the baffling T-linear resistivity over a huge temperature range near optimal (hole) doping has been observed (9), flagging, in this sense, a nonFermi liquid (n-FL) behavior in the metallic state above T c . This has led to new theoretical concepts, some related [e.g., phenomenology of ''marginal Fermi liquid'' (10)] and some unrelated [e.g., ''strange metal'' state (11)] to quantum criticality. In most considerations of cuprates near quantum critical points (QCPs) the tuning parameter is charge doping (1, 10); and although there is some experimental support (7, 12) for a doping-driven QCP, it is still...

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“…However, the recent proposal by Kopp et al (8) that ferromagnetic (FM) fluctuations compete with d-wave superconductivity is a challenge to the notion that overdoped copper oxides strictly conform to such conventional wisdom. The primary motivation for their hypothesis is a strong upturn in the magnetic susceptibility immediately above T c for doping levels greater than p ∼ 0.19 (9)(10)(11)(12)(13)(14). A tendency toward FM order for high charge doping ( Fig.…”

mentioning

confidence: 98%

Direct search for a ferromagnetic phase in a heavily overdoped nonsuperconducting copper oxide

Sonier

Kaiser

Pacradouni

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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The doping of charge carriers into the CuO 2 planes of copper oxide Mott insulators causes a gradual destruction of antiferromagnetism and the emergence of high-temperature superconductivity. Optimal superconductivity is achieved at a doping concentration p beyond which further increases in doping cause a weakening and eventual disappearance of superconductivity. A potential explanation for this demise is that ferromagnetic fluctuations compete with superconductivity in the overdoped regime. In this case, a ferromagnetic phase at very low temperatures is predicted to exist beyond the doping concentration at which superconductivity disappears. Here we report on a direct examination of this scenario in overdoped La 2−x Sr x CuO 4 using the technique of muon spin relaxation. We detect the onset of static magnetic moments of electronic origin at low temperature in the heavily overdoped nonsuperconducting region. However, the magnetism does not exist in a commensurate long-range ordered state. Instead it appears as a dilute concentration of static magnetic moments. This finding places severe restrictions on the form of ferromagnetism that may exist in the overdoped regime. Although an extrinsic impurity cannot be absolutely ruled out as the source of the magnetism that does occur, the results presented here lend support to electronic band calculations that predict the occurrence of weak localized ferromagnetism at high doping.A ttempts within the framework of standard theories have failed to explain how high-temperature superconductivity emerges from charge carrier doping of an antiferromagnetic (AF) Mott insulator (1). The conventional Bardeen-CooperSchrieffer (BCS) theory of low-temperature superconductors (2) assumes that above the critical transition temperature (T c ) the electrons form a Landau Fermi liquid, and that superconductivity arises from pair condensation of the associated low-energy excitations (quasiparticles). What is clear in the case of copper oxides is that over the initial doping range where superconductivity first appears, ordinary Landau Fermi liquid theory does not apply. This realization has prompted theories in which the properties of the ordinary Fermi liquid are hidden (3), or alternatively only some properties of the Fermi liquid persist (4).A BCS-type theory may be applicable in the heavily overdoped region, where an ordinary Fermi liquid is observed (5-7). However, the recent proposal by Kopp et al. (8) that ferromagnetic (FM) fluctuations compete with d-wave superconductivity is a challenge to the notion that overdoped copper oxides strictly conform to such conventional wisdom. The primary motivation for their hypothesis is a strong upturn in the magnetic susceptibility immediately above T c for doping levels greater than p ∼ 0.19 (9-14). A tendency toward FM order for high charge doping (Fig. 1) is supported by electronic band calculations for super cells of La 2−x Ba x CuO 4 (15). However, these calculations favor the appearance of weak ferromagnetism about concentrated regions of ...

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Transport and magnetic properties ofTl2Ba2
Yoshimi Kubo
¹
,
Yuichi Shimakawa
²
,
T. Manako
³

et al.

Cited by 247 publications

References 16 publications

Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−x
Ando
¹
,
Murayama
²

1999
Phys. Rev. B
91
12
100
2
View full text Add to dashboard Cite

Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−x
Ando
¹
,
Murayama
²

1999
Phys. Rev. B
91
12
100
2
View full text Add to dashboard Cite

Field-induced quantum critical route to a Fermi liquid in high-temperature superconductors

Direct search for a ferromagnetic phase in a heavily overdoped nonsuperconducting copper oxide

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Transport and magnetic properties ofTl2Ba2Yoshimi Kubo1, Yuichi Shimakawa2, T. Manako3 et al.

Cited by 247 publications

References 16 publications

Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−xAndo1, Murayama2 1999Phys. Rev. B91121002View full textAdd to dashboardCite

Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−xAndo1, Murayama2 1999Phys. Rev. B91121002View full textAdd to dashboardCite

Field-induced quantum critical route to a Fermi liquid in high-temperature superconductors

Direct search for a ferromagnetic phase in a heavily overdoped nonsuperconducting copper oxide

Contact Info

Product

Resources

About

Transport and magnetic properties ofTl2Ba2
Yoshimi Kubo
¹
,
Yuichi Shimakawa
²
,
T. Manako
³

et al.

Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−x
Ando
¹
,
Murayama
²

1999
Phys. Rev. B
91
12
100
2
View full text Add to dashboard Cite

Nonuniversal power law of the Hall scattering rate in a single-layer cuprateBi2Sr2−x
Ando
¹
,
Murayama
²

1999
Phys. Rev. B
91
12
100
2
View full text Add to dashboard Cite