Doping dependence of the vortex glass and sublimation transitions in the high-Tc superconductor La2-xSrxCuO4 as determined from macroscopic measurements

Gilardi, R.; Streule, S.; Momono, N.; Oda, Masahiro; Mesot, J.

doi:10.1140/epjb/e2005-00322-1

Cited by 10 publications

(8 citation statements)

References 49 publications

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“…Could there be some sort of inhomogeneity in the samples that causes the ρ and ρ ⊥ measurements to be determined by distinct phases? Before addressing this question, we point out that the phase boundary for superconducting order determined by our ρ ⊥ data is quantitatively consistent with results in the literature 15,[19][20][21]43,44 for LSCO and LBCO with x ∼ 0.1. It follows that only the behavior of ρ is anomalous.…”

Section: B Analysis Of ρsupporting

confidence: 88%

Uniaxial linear resistivity of superconducting La1.905Ba0.095CuO4
Wen
¹
,
Qi
²
,
Li
³

et al. 2012
Phys. Rev. B
43
8
55
1
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We present an experimental study of the anisotropic resistivity of superconducting La2−xBaxCuO4 with x = 0.095 and transition temperature Tc = 32 K. In a magnetic field perpendicular to the CuO2 layers, H ⊥ , we observe that the resistivity perpendicular to the layers, ρ ⊥ , becomes finite at a temperature consistent with previous studies on very similar materials; however, the onset of finite parallel resistivity, ρ , occurs at a much higher temperature. This behavior contradicts conventional theory, which predicts that ρ ⊥ and ρ should become finite at the same temperature. Voltage vs. current measurements near the threshold of voltage detetability indicate linear behavior perpendicular to the layers, becoming nonlinear at higher currents, while the behavior is nonlinear from the onset parallel to the layers. These results, in the presence of moderate H ⊥ , appear consistent with superconducting order parallel to the layers with voltage fluctuations between the layers due to thermal noise. In search of uncommon effects that might help to explain this behavior, we have performed diffraction measurements that provide evidence for H ⊥ -induced charge and spin stripe order. The field-induced decoupling of superconducting layers is similar to the decoupled phase observed previously in La2−xBaxCuO4 with x = 1/8 in zero field.

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Section: B Analysis Of ρsupporting

confidence: 88%

Uniaxial linear resistivity of superconducting La1.905Ba0.095CuO4
Wen
¹
,
Qi
²
,
Li
³

et al. 2012
Phys. Rev. B
43
8
55
1
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“…In addition, by using in Eq. (14) f = 1, s = 6.6Å, T ≈ 30 K, and μ 0 H c2 (0) = 36 T, 35 one finds χ ≈ −2 × 10 −6 ε −1 , which takes values orders of magnitude smaller than those that one may directly infer from the experimental data given in Figs. 6(a) and 6(c).…”

Section: Inside the Full Inhomogeneous Region: Giant And Nonlineamentioning

confidence: 75%

Diamagnetism above the superconducting transition in underdoped La1.9Sr0.1CuO4
Mosqueira
¹
,
Dancausa
²
,
Vidal
³

2011
Phys. Rev. B
16
7
29
0
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The interplay between superconducting fluctuations and inhomogeneities presents a renewed interest due to recent works of different groups, which apparently support an intrinsically anomalous (beyond the conventional Gaussian-Ginzburg-Landau scenario) diamagnetism above T c in underdoped cuprates. This conclusion, mainly based in the observation of new anomalies in the isothermal magnetization curves at low-field amplitudes, is in contradiction with our earlier results in the underdoped La 1.9 Sr 0.1 CuO 4 [Phys. Rev. Lett. 84, 3157 (2000)]. These seemingly intrinsic anomalies are being presented in various influential works as a "thermodynamic evidence" for phase incoherent superconductivity in the pseudogap regime, this last being at present a central and debated issue of the cuprate superconductors' physics. To further probe the diamagnetism above T c in underdoped cuprates, here we have extended our magnetization measurements in La 1.9 Sr 0.1 CuO 4 to two samples with the same nominal composition but, due to different growth procedures, with different chemical disorder, in one of the samples this disorder being close to the intrinsic-like one, associated with the unavoidable random distribution of the Sr ions (which will be then present even in an ideal La 1.9 Sr 0.1 CuO 4 crystal). For this sample, the corresponding T c inhomogeneities may be approximated as symmetric around the average T c . In contrast, the most disordered sample presents a pronounced asymmetric T c distribution. The comparison between the magnetization measured in both samples provides a crucial check of the chemical disorder origin of the observed diamagnetism anomalies, which are similar to those claimed as due to phase fluctuations by other authors. This conclusion applies also to the sample affected only by the intrinsic-like chemical disorder, providing then a further check that, for all applied magnetic field amplitudes, the intrinsic diamagnetism above the superconducting transition of underdoped cuprates is not affected by the opening of a pseudogap in the normal state. It is also shown here that once these disorder effects are overcome, the remaining precursor diamagnetism may be accounted at a quantitative level in terms of the Gaussian-Ginzburg-Landau approach under a total energy cutoff.

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“…The value 0:097 0:005 is in line with a Sr concentration of x 0:105 0:005 [19]. The sample has been characterized by magnetization and ac-susceptibility measurements in magnetic fields H up to 8 T along the crystallographic c axis [20], as well as small-angle neutron scattering (SANS) and SR [21]. All measurements indicate that in the underdoped regime of LSCO, the vortex liquid phase dominates the magnetic phase diagram, while a quasi-long-range ordered vortex lattice can only be observed at low fields or temperatures [21].…”

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confidence: 83%

Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the UnderdopedLa1.895Sr0.105CuO4Superconductor

et al. 2007

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High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La 1:895 Sr 0:105 CuO 4 (LSCO). In zero field, the temperature dependence of the low-energy peak intensity at the incommensurate momentum transfer Q IC 0:5; 0:5 ; 0; 0:5 ; 0:5; 0 exhibits an anomaly at the superconducting T c which broadens and shifts to lower temperature upon the application of a magnetic field along the c axis. A field-induced enhancement of the spectral weight is observed, but only at finite energy transfers and in an intermediate temperature range. These observations establish the opening of a strongly downward renormalized spin gap in the underdoped regime of LSCO. This behavior contrasts with the observed doping dependence of most electronic energy features. DOI: 10.1103/PhysRevLett.98.077004 PACS numbers: 74.72.ÿh, 61.12.Ex, 74.20.Mn, 74.25.Ha In studies of high-temperature superconductors (HTSC), one central challenge is to explain the evolution from an antiferromagnetic (AF) Mott insulator to a metallic superconductor upon doping. For example, the intimate interplay between magnetism and superconductivity has been revealed in momentum resolved inelastic neutron scattering (INS) experiments on La 2ÿx Sr x CuO 4 (LSCO) [1][2][3][4][5] and YBa 2 Cu 3 O 6x (YBCO) [6,7] that showed the opening of a spin gap (SG) SG at the superconducting (SC) critical temperature (T c ). In contrast to the single-particle SC gap probed by, e.g., angle-resolved photoemission spectroscopy (ARPES) [8,9], the SG scales with T c in the overdoped to slightly underdoped regime. The situation is more complicated in more underdoped samples. For instance, in YBCO the ratio SG =k B T c decreases with strong underdoping [10,11], while for underdoped LSCO (x < 0:12) the changes are even more dramatic, since no direct neutron scattering evidence for a SG has been reported so far [12]. This latter fact would seem to indicate that the underdoped regime of LSCO cannot be described in terms of a homogeneous electronic liquid and more exotic scenarios have been suggested, such as the formation of dynamical stripes [13] or presence of a d-density wave (DDW) order [14]. Further insight into the interplay between magnetism and superconductivity in LSCO has been revealed in a number of studies of the effects of an applied magnetic field, which at optimal doping enhances the low-energy magnetic fluctuations and at underdoping induces static antiferromagnetism [15][16][17].In this Letter, based on high-resolution INS data as a function of energy @!, magnetic field H, and temperature T, we identify similarities and differences between the magnetic response in the underdoped and optimal doped regimes of LSCO. Our main result is the observation of a dramatic field-induced enhancement of the response at low energies and the identification, below T c , of a SG in the underdoped regime (x 0:105), whose characteristic energy is strongly renormalized relative to that measured at optimal doping. We also show that this behavior is no...

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Doping dependence of the vortex glass and sublimation transitions in the high-Tc superconductor La2-xSrxCuO4 as determined from macroscopic measurements

Cited by 10 publications

References 49 publications

Uniaxial linear resistivity of superconducting La1.905Ba0.095CuO4
Wen
¹
,
Qi
²
,
Li
³

et al. 2012
Phys. Rev. B
43
8
55
1
View full text Add to dashboard Cite

Uniaxial linear resistivity of superconducting La1.905Ba0.095CuO4
Wen
¹
,
Qi
²
,
Li
³

et al. 2012
Phys. Rev. B
43
8
55
1
View full text Add to dashboard Cite

Diamagnetism above the superconducting transition in underdoped La1.9Sr0.1CuO4
Mosqueira
¹
,
Dancausa
²
,
Vidal
³

2011
Phys. Rev. B
16
7
29
0
View full text Add to dashboard Cite

Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the UnderdopedLa1.895Sr0.105CuO4Superconductor

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Doping dependence of the vortex glass and sublimation transitions in the high-Tc superconductor La2-xSrxCuO4 as determined from macroscopic measurements

Cited by 10 publications

References 49 publications

Uniaxial linear resistivity of superconducting La1.905Ba0.095CuO4Wen1, Qi2, Li3 et al. 2012Phys. Rev. B438551View full textAdd to dashboardCite

Uniaxial linear resistivity of superconducting La1.905Ba0.095CuO4Wen1, Qi2, Li3 et al. 2012Phys. Rev. B438551View full textAdd to dashboardCite

Diamagnetism above the superconducting transition in underdoped La1.9Sr0.1CuO4Mosqueira1, Dancausa2, Vidal3 2011Phys. Rev. B167290View full textAdd to dashboardCite

Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the UnderdopedLa1.895Sr0.105CuO4Superconductor

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Product

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Uniaxial linear resistivity of superconducting La1.905Ba0.095CuO4
Wen
¹
,
Qi
²
,
Li
³

et al. 2012
Phys. Rev. B
43
8
55
1
View full text Add to dashboard Cite

Uniaxial linear resistivity of superconducting La1.905Ba0.095CuO4
Wen
¹
,
Qi
²
,
Li
³

et al. 2012
Phys. Rev. B
43
8
55
1
View full text Add to dashboard Cite

Diamagnetism above the superconducting transition in underdoped La1.9Sr0.1CuO4
Mosqueira
¹
,
Dancausa
²
,
Vidal
³

2011
Phys. Rev. B
16
7
29
0
View full text Add to dashboard Cite