Carrier dynamics and infrared-active phonons in c-axis oriented RuSr2GdCu2O8 film

Litvinchuk, A. P.; Chen, S.Y; Iliev, M. N.; Chen, C.L; Chu, C. W.; Popov, V. N.

doi:10.1016/s0921-4534(01)00607-4

Cited by 2 publications

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References 16 publications

(12 reference statements)

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“…Anomalous physical properties have been observed recently in the weak-ferromagnetic (WFM induced by canted antiferromagnetism) and high-T c superconducting RuSr 2 RCu 2 O 8 system (Ru-1212 with R = Sm, Eu, Gd, and Y) having a tetragonal TlBa 2 CaCu 2 O 7 -type structure. 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48 Possible superconductivity was also reported in Casubstituted WFM compounds RuCa 2 RCu 2 O 8 (R = Pr-Gd). 49,…”

Section: Introductionmentioning

confidence: 80%

Anomalous physical properties of underdoped weak-ferromagnetic superconductor RuSr2EuCu2O8

Chang

2008

Physica B: Condensed Matter

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Similar to the optimal-doped, weak-ferromagnetic (WFM induced by canted antiferromagnetism, TCurie = 131 K) and superconducting (Tc = 56 K) RuSr2GdCu2O8, the underdoped RuSr2EuCu2O8 (TCurie = 133 K, Tc = 36 K) also exhibited a spontaneous vortex state (SVS) between 16 K and 36 K. The low field (±20 G) superconducting hysteresis loop indicates a weak and narrow Meissner state region of average lower critical field B ave c1 (T) = B ave c1 (0)[1 -(T/TSV S ) 2 ], with B ave c1 (0) = 7 G and TSV S = 16 K. The vortex melting transition (T melting = 21 K) below Tc obtained from the broad resistivity drop and the onset of diamagnetic signal indicates a vortex liquid region due to the coexistence and interplay between superconductivity and WFM order. No visible jump in specific heat was observed near Tc for Eu-and Gd-compound. This is not surprising, since the electronic specific heat is easily overshadowed by the large phonon and weak-ferromagnetic contributions. Furthermore, a broad resistivity transition due to low vortex melting temperature would also lead to a correspondingly reduced height of any specific heat jump. Finally, with the baseline from the nonmagnetic Eu-compound, specific heat data analysis confirms the magnetic entropy associated with antiferromagnetic ordering of Gd 3+ (J = S = 7/2) at 2.5 K to be close to NAk ln8 as expected.

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Section: Introductionmentioning

confidence: 80%

Anomalous physical properties of underdoped weak-ferromagnetic superconductor RuSr2EuCu2O8

Chang

2008

Physica B: Condensed Matter

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Critical fields and the spontaneous vortex state in the weakly ferromagnetic superconductorRuSr2GdCu2O8

Yang

Chang

et al. 2005

Phys. Rev. B

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A spontaneous vortex state ͑SVS͒ between 30 and 56 K was observed for the weak-ferromagnetic superconductor RuSr 2 GdCu 2 O 8 with the ferromagnetic Curie temperature T C = 131 K and the superconducting transition temperature T c = 56 K. The low-field ͑±20 G͒ super-conducting hysteresis loop indicates a narrow Meissner state region within the average lower critical field= 12 G and T 0 = 30 K. Full Meissner shielding signal in very low applied field indicates an ab plane B c1 ab ͑0͒ ϳ 4 G with an estimated anisotropic parameter ␥ ϳ 7 for this layered system. The existence of a spontaneous vortex state between 30 and 56 K is the result of weak-ferromagnetic order with a net spontaneous magnetic moment of ϳ0.1 B / Ru, which generates a weak magnetic dipole field around 10 G in the CuO 2 bilayers. The upper critical field B c2 varies linearly as ͑1−T / T c ͒ up to 7-T field. The vortex melting line B m varies as ͑1−T / T m ͒ 3.5 with melting transition temperature T m = 39 K and a very broad vortex liquid region due to the coexistence and the interplay between superconductivity and weak-ferromagnetic order.

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Carrier dynamics and infrared-active phonons in c-axis oriented RuSr2GdCu2O8 film

Cited by 2 publications

References 16 publications

Anomalous physical properties of underdoped weak-ferromagnetic superconductor RuSr2EuCu2O8

Anomalous physical properties of underdoped weak-ferromagnetic superconductor RuSr2EuCu2O8

Critical fields and the spontaneous vortex state in the weakly ferromagnetic superconductorRuSr2GdCu2O8

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