Magnetic-field dependence of the low-temperature specific heat of some high-Tc copper-oxide superconductors evidence for an contribution in the mixed state

Fisher, Robert A.; Gordon, J. E.; Reklis, S. F.; Wright, D. A.; Emerson, J. P.; Woodfield, Brian F.; McCarron, E.M.; Phillips, N. E.

doi:10.1016/0921-4534(95)00463-7

Cited by 57 publications

(35 citation statements)

References 56 publications

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“…Similar quantum oscillations have been reported in YBCO from magneto-transport and magnetization measurements (1) (4) (5) (6 been proposed that this large value for γ(0) originates from a disorder-generated finite density of quasiparticle states near the d-wave nodes; however, this value in YBCO is larger than reported for LSCO, a material that is considered to be significantly more disordered (33).…”

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confidence: 50%

Heat capacity through the magnetic-field-induced resistive transition in an underdoped high-temperature superconductor

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Heat capacity through the magnetic-field-induced resistive transition in an underdoped high-temperature superconductor

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“…Even for the present crystal, the residual Schottky contribution due to paramagnetic centers is no longer negligible compared to the reduced vortex contribution. We face for the B⊥c configuration the same problem as the Stanford [8,9] and Berkeley [10,11] groups did for the B c configuration. As data for B⊥c are expected to lie in the crossover regime (the crossover temperature scales with (B/Γ) 1/2 ), a fit to a C =A ab T B 1/2 law is not justified beforehand.…”

Section: B Ab-planementioning

confidence: 99%

“…All three are sample-dependent. In order to separate the d-wave contribution of interest, the Stanford [8,9] and Berkeley [10,11] groups fitted models to their data, and concluded that a d-wave contribution was present. Numerical results were: α = 0.10 to 0.11 mJ/K 3 mol, A c = 0.88 to 0.91 mJ/K 2 T 1/2 mol according to Moler et al., [8,9] who used both twinned and untwinned crystals, and α = 0.064 ± 0.02 mJ/K 3 mol, A c = 0.91 mJ/K 2 T 1/2 mol according to Wright et al, [11] who used ceramic samples.…”

Section: Introductionmentioning

confidence: 99%

Direct observation and anisotropy of the contribution of gap nodes in the low-temperature specific heat ofYBa2Cu3
Wang
¹
,
Revaz
²
,
Erb
³

et al. 2001
Phys. Rev. B
85
13
97
1
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The specific heat due to line nodes in the superconducting gap of YBa 2 Cu 3 O 7 has been blurred up to now by magnetic terms of extrinsic origin, even for high quality crystals. We report the specific heat of a new single crystal grown in a non-corrosive BaZrO 3 crucible, for which paramagnetic terms are reduced to ≈ 0.006% spin-1/2 per Cu atom. The contribution of line nodes shows up directly in the difference C(B, T ) − C(0, T ) at fixed temperatures (T < 5 K) as a function of the magnetic field parallel to the c-axis (B ≤ 14 T). These data illustrate the smooth crossover from C ∝ T 2 at low fields to C ∝ T B 1/2 at high fields, and provide new values for gap parameters which are quantitatively consistent with tunneling spectroscopy and thermal conductivity in the framework of d x 2 −y 2 pairing symmetry. Data for B along the nodal and antinodal directions in the ab-plane are also provided. The in-plane anisotropy predicted in the clean limit is not observed.

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“…Experimentally, a √ HT term has indeed been identified in specific heat measurements on single crystals of Y BCO, [7] but other measurements find deviations from this behavior. [8,9] Scaling behavior has been reported in the specific heat of Y BCO, [10] but with significant scatter over a limited range. Very recently, impressive scaling results for the thermal conductivity of single crystals of the unconventional heavy fermion superconductor U P t 3 were also obtained by Suderow et al [11] In this work we argue that transport at low magnetic fields and temperatures in superconductors with line nodes in the gap can be understood within a model in which quasiparticles are scattered by the same physical processes which dominate transport in the zero-field state.…”

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Quasiparticle Transport Properties ofd-Wave Superconductors in the Vortex State

1998

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We calculate the magnetic field dependence of quasiparticle transport properties in the vortex state of a d-wave superconductor arising solely from the quasiparticle's Doppler shift in the superflow field surrounding the vortex. Qualitative features agree well with experiments on cuprate and heavy fermion superconductors at low fields and temperatures. We derive scaling relations in the variable T /H 1/2 valid at sufficiently low temperatures T and fields H, but show that these relations depend on the scattering phase shift, and are in general fulfilled only approximately even in the clean limit, due to the energy dependence of the quasiparticle relaxation time.PACS Numbers: 74.25.Fy,74.60.Ec Introduction. While the origins of high-temperature superconductivity and the non-Fermi liquid nature of the normal state in the cuprates are not understood, recently a consensus has been emerging that the superconducting state itself is not particularly exotic, in the sense that it consists of a BCS-like pair state with well-defined quasiparticle excitations above it. Although the order parameter in these materials is now thought to display d-wave symmetry, ranking them among the few known "unconventional" superconductors, it has been argued that the prediction of observable properties in the superconducting state is now a relatively routine task.In the study of transport properties, however, questions arise which prevent one from drawing such sanguine conclusions. Recent measurements of thermal conductivity in both the LSCO-214 and BSCCO-2212 systems have hinted at qualitatively new physics in the vortex state at low temperatures and fields. [1,2] In the LSCO case, a logarithmic dependence on field has been found suggestive of quantum interference effects; in the BSCCO case, a kink in the thermal conductivity as a function of field occurs, apparently signaling a transition to a new superconducting phase at higher fields.In order to extract which aspects of the new phenomena are due to qualitatively "new" physics, one needs first to understand which aspects can be attributed to the perhaps more mundane but still largely unexplored phenomenology of quasiparticles in the d-wave vortex state. A fundamental observation regarding the thermodynamics of this state was made by Volovik, who pointed out that, in contrast to classic superconductors, in d-wave systems the entropy and density of states was dominated by contributions from extended quasiparticle states rather than the bound states associated with vortex cores. The remarkable consequence of this observation, which occurs due to the existence of order parameter nodes in the clean d-wave state, is a term in the specific heat of the superconductor in a field varying as √ HT rather than as HT as in the classic case. Other calculations, dependent only on the Dirac-like spectrum of nodal quasiparticles excited at low temperature, gave the field dependence of the density of states N (ω; H) [4] and predicted the specific heat should scale as C(T ; H)/T 2 ∼ F C (X), where X ≡ T...

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Magnetic-field dependence of the low-temperature specific heat of some high-Tc copper-oxide superconductors evidence for an contribution in the mixed state

Cited by 57 publications

References 56 publications

Heat capacity through the magnetic-field-induced resistive transition in an underdoped high-temperature superconductor

Heat capacity through the magnetic-field-induced resistive transition in an underdoped high-temperature superconductor

Direct observation and anisotropy of the contribution of gap nodes in the low-temperature specific heat ofYBa2Cu3
Wang
¹
,
Revaz
²
,
Erb
³

et al. 2001
Phys. Rev. B
85
13
97
1
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Quasiparticle Transport Properties ofd-Wave Superconductors in the Vortex State

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Magnetic-field dependence of the low-temperature specific heat of some high-Tc copper-oxide superconductors evidence for an contribution in the mixed state

Cited by 57 publications

References 56 publications

Heat capacity through the magnetic-field-induced resistive transition in an underdoped high-temperature superconductor

Heat capacity through the magnetic-field-induced resistive transition in an underdoped high-temperature superconductor

Direct observation and anisotropy of the contribution of gap nodes in the low-temperature specific heat ofYBa2Cu3Wang1, Revaz2, Erb3 et al. 2001Phys. Rev. B8513971View full textAdd to dashboardCite

Quasiparticle Transport Properties ofd-Wave Superconductors in the Vortex State

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Direct observation and anisotropy of the contribution of gap nodes in the low-temperature specific heat ofYBa2Cu3
Wang
¹
,
Revaz
²
,
Erb
³

et al. 2001
Phys. Rev. B
85
13
97
1
View full text Add to dashboard Cite