Observation of the Antiferromagnetic Ordering in La<sub>2</sub>CuO<sub>4</sub>

Yamaguchi, Yasuo; Yamauchi, Hiroshi; Ohashi, Masayoshi; Yamamoto, Hirotsugu; Shimoda, Nobuyuki; Kikuchi, Masae; Syono, Yasuhiko

doi:10.1143/jjap.26.l447

Cited by 72 publications

(6 citation statements)

References 3 publications

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“…The existence of Sr 2 CuO 2 Cl 2 has also been well-known since 1970s. , Vaknin et al reported that a three-dimensional antiferromagnetic structure is identified below the Néel temperature T N = 251 K by neutron diffraction. This T N is similar to that for La 2 CuO 4 ( T N ∼ 250 K). , Theoretical studies of its electronic structure predicted that proper hole doping (0.35−0.38 per Cu) into Sr 2 CuO 2 Cl 2 would induce superconductivity with T c around 25 K. , Hiroi et al reported that a similar way of hole doping to the case of Ca 2 CuO 2 Cl 2 , i.e., sodium and potassium substituting for calcium, does not work for Sr 2 CuO 2 Cl 2 .…”

Section: Oxychloride (X = Cl)supporting

confidence: 59%

Halooxocuprate Superconductors and Related Compounds with the 02(n − 1)n and 0222 Structures

et al. 1998

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Halooxocuprates with the so-called 02(n − 1)n (n = 1−5) and the 0222 structures, containing F, Cl, and Br, are reviewed. These compounds are prepared by conventional solid-state reaction: low-temperature fluorination or high-pressure synthesis. Their structural properties and superconductivity are focused on in this review. Bulk superconductivity has been observed in various samples prepared using high-pressure techniques. On the other hand, the reported halooxocuprate superconductors prepared at ambient pressure need more data for verification of superconducting behavior. The carrier-doping routes for the halooxocuprates are discussed. It is confirmed that p-type superconductivity occurs in oxychlorides in which the apical sites are completely occupied by chlorine. This indicates that the existence of the apical oxygen is not a must for high-T c superconductivity with p-type carriers.

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Section: Oxychloride (X = Cl)supporting

confidence: 59%

Halooxocuprate Superconductors and Related Compounds with the 02(n − 1)n and 0222 Structures

et al. 1998

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“…In powder diffraction, the structural superlattice peaks are weak, but significantly more prominent than the magnetic peaks, which are smaller than the background [46]. An early diffraction study mis-identified the structural peaks as antiferromagnetic peaks [47]. The use of polarized neutron diffraction eventually confirmed the proper identification [48].…”

Section: Magnetic Structurementioning

confidence: 99%

Spins, stripes, and superconductivity in hole-doped cuprates

Tranquada¹

2013

AIP Conference Proceedings

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Abstract. One of the major themes in correlated electron physics over the last quarter century has been the problem of high-temperature superconductivity in hole-doped copper-oxide compounds. Fundamental to this problem is the competition between antiferromagnetic spin correlations, a symptom of strong Coulomb interactions, and the kinetic energy of the doped carriers, which favors delocalization. After discussing some of the early challenges in the field, I describe the experimental picture provided by a variety of spectroscopic and transport techniques. Then I turn to the technique of neutron scattering, and discuss how it is used to determine spin correlations, especially in model systems of quantum magnetism. Neutron scattering and complementary techniques have determined the extent to which antiferromagnetic spin correlations survive in the cuprate superconductors. One experimental case involves the ordering of spin and charge stripes. I first consider related measurements on model compounds, such as La 2−x Sr x NiO 4+δ , and then discuss the case of La 2−x Ba x CuO 4 . In the latter system, recent transport studies have demonstrated that quasi-two-dimensional superconductivity coexists with the stripe order, but with frustrated phase order between the layers. This has led to new concepts for the coexistence of spin order and superconductivity. While the relevance of stripe correlations to high-temperature superconductivity remains a subject of controversy, there is no question that stripes are an intriguing example of electron matter that results from strong correlations.Keywords: superconductivity, antiferromagnetism, charge order, stripes, cuprates, nickelates, neutron scattering PACS: 78.70.Nx OPENING REMARKSCuprate superconductivity is a fascinating field, with an enormous literature. There have been a great many measurements done on a wide variety of cuprate families. There are numerous theoretical perspectives on the nature of these materials and on the mechanism of superconductivity.I approach this topic not as an unbiased outside observer, but as a participant who has been around from the beginning. My purpose here is not to present a balanced review of all work and perspectives in the field, as there would be too much to cover. Instead, I will present one story about hole-doped cuprates, based largely on experiment and especially on neutron scattering studies. Since one of the main advantages of neutrons is their ability to follow dynamic antiferromagnetic spin correlations, it should come as no surprise that they will play a key role in the story.I have tried to cite sufficient references (especially review articles) so that the curious reader can find further information and potentially a starting point in searching the broader literature. I have not attempted to cite all relevant work, as that would have been

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“…The antiferromagnetism was detected there in the studies of susceptibility [21], neutron scattering [22][23][24] and μSR [25,26]. In μSR studies the magnetic ordering was seen as spontaneous oscillations in zero-field experiments.…”

Section: "214"mentioning

confidence: 95%