Growth of faceted niobium diselenide

Oglesby, C. S.; Bücher, E.; Kloc, Christian; Hohl, H.

doi:10.1016/0022-0248(94)91287-4

Cited by 55 publications

(35 citation statements)

References 11 publications

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“…37 The phase diagram for a number of crystals was characterized using a 7-T MPMS XL (Quantum Design) and reported previously. 38 Our crystals only showed minor, insignificant variations compared to other literature results.…”

Section: Experimental Details a Samplesmentioning

confidence: 99%

Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2 : Interplay between plastic and elastic energy barriers

et al. 2017

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We studied thermal and dynamic history effects in the vortex lattice (VL) near the order-disorder transition in clean NbSe2 single crystals. Comparing the evolution of the effective vortex pinning and the bulk VL structure, we observed metastable superheated and supercooled VL configurations that coexist with a hysteretic effective pinning response due to thermal cycling of the system. A novel scenario, governed by the interplay between (lower) elastic and (higher) plastic energy barriers, is proposed as an explanation for our observations: Plastic barriers, which prevent the annihilation or creation of topological defects, require dynamic assistance to be overcome and to achieve a stable VL at each temperature. Conversely, thermal hysteresis in the pining response is ascribed to low energy barriers, which inhibit rearrangement within a single VL correlation volume and are easily overcome as the relative strength of competing interactions changes with temperature.

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Section: Experimental Details a Samplesmentioning

confidence: 99%

Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2 : Interplay between plastic and elastic energy barriers

et al. 2017

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“…Since the contribution from Umklapp effects is generally weaker than that of the direct interactions, 1 − T Chiral /T CDW ∝ a 1 a 0 may be expected to be small [5]. X-ray diffraction.-Single crystals of TiSe 2 were prepared using the iodine vapor transport method [18]. A sample of 3x3x0.05 mm 3 was mounted on the cold finger of a closed cycle displex and aligned on a Huber six-circle diffractometer.…”

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confidence: 99%

Chiral Phase Transition in Charge Ordered1T−TiSe2

et al. 2013

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It was recently discovered that the low temperature, charge ordered phase of 1T-TiSe 2 has a chiral character. This unexpected chirality in a system described by a scalar order parameter could be explained in a model where the emergence of relative phase shifts between three charge density wave components breaks the inversion symmetry of the lattice. Here, we present experimental evidence for the sequence of phase transitions predicted by that theory, going from disorder to non-chiral and finally to chiral charge order. Employing X-ray diffraction, specific heat, and electrical transport measurements, we find that a novel phase transition occurs ∼ 7 K below the main charge ordering transition in TiSe 2 , in agreement with the predicted hierarchy of charge ordered phases. Introduction.-The modulation of electronic density which emerges in charge ordered materials reduces the translational symmetry of the underlying lattice. Additional symmetries may be broken through the coupling to atomic displacements, and these are often key in understanding the material properties of charge ordered systems. The broken rotational symmetry in 2H-TaSe 2 , for example, yields a reentrant phase transition under pressure [1], while the broken inversion symmetry in rare-earth nickelates RNiO 3 , renders them multiferroic [2].Recently, it was discovered that the breakdown of inversion symmetry in the charge ordered phase of 1T-TiSe 2 leads to the presence of a chiral structure at low temperatures [3][4][5][6][7][8][9]. In this phase, a helical charge density distribution arises from a rotation of the dominant charge density wave component as one progresses through consecutive atomic layers. While helical phases are common among spin-density waves, with vectorial order parameters, 1T-TiSe 2 is one of only very few materials so far in which a chiral charge ordered phase, with a scalar order parameter, has been suggested to exist [10,11]. A mechanism for the formation of this scalar chirality in TiSe 2 was recently proposed, in which the chiral phase is interpreted to be simultaneously charge and orbital ordered [5].The scanning tunneling microscopy experiments in which the chirality of TiSe 2 was initially revealed, were performed well below the onset temperature of charge order in this material [3]. There is currently no experimental information on the nature of the transition between the chiral and the normal state. Here, we present experimental evidence for a sequence of two transitions, the well-known onset of charge order at ∼ 190 K and a novel transition at ∼ 183 K. The temperature dependence of X-ray superlattice reflections unnoticed in previous studies, combined with an analysis of their structure factors, and the temperature dependences of the specific heat and resistance anisotropy, strongly suggests a scenario in which the transition at ∼ 183 K indicates the emergence of chiral charge order out of the non-chiral charge density wave state. The existence of this hierarchy of transitions, as well as the observed experimental s...

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“…These make NbSe 2 an interesting system, especially since the high-T c cuprates are believed to share some of these properties 4 . I − V curves were measured at 2.1 K on a 2H-NbSe 2 single crystal 18 cleaved at room temperature in vacuum (5 × 10 −7 torr). For junction resistances larger than 40 kΩ, the scaled tunneling current I(V ) × R N is independent of R N .…”

Section: Results and Discussion -Nbse2mentioning

confidence: 99%

Josephson Effect in Pb/I/NbSe₂ Scanning Tunneling Microscope Junctions

Naaman

Dynes

Bücher³

2003

Int. J. Mod. Phys. B

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We have developed a method for the reproducible fabrication of superconducting scanning tunneling microscope (STM) tips. We use these tips to form superconductor/insulator/superconductor tunnel junctions with the STM tip as one of the electrodes. We show that such junctions exhibit fluctuation dominated Josephson effects, and describe how the Josephson product IcRN can be inferred from the junctions' tunneling characteristics in this regime. This is first demonstrated for tunneling into Pb films, and then applied in studies of single crystals of NbSe2. We find that in NbSe2, IcRN is lower than expected, which could be attributed to the interplay between superconductivity and the coexisting charge density wave in this material.

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Growth of faceted niobium diselenide

Cited by 55 publications

References 11 publications

Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2 : Interplay between plastic and elastic energy barriers

Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2 : Interplay between plastic and elastic energy barriers

Chiral Phase Transition in Charge Ordered1T−TiSe2

Josephson Effect in Pb/I/NbSe₂ Scanning Tunneling Microscope Junctions

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Growth of faceted niobium diselenide

Cited by 55 publications

References 11 publications

Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2 : Interplay between plastic and elastic energy barriers

Metastability and hysteretic vortex pinning near the order-disorder transition in NbSe2 : Interplay between plastic and elastic energy barriers

Chiral Phase Transition in Charge Ordered1T−TiSe2

Josephson Effect in Pb/I/NbSe2 Scanning Tunneling Microscope Junctions

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Josephson Effect in Pb/I/NbSe₂ Scanning Tunneling Microscope Junctions