Upper critical field of the noncentrosymmetric superconductor BiPd

Peets, Darren C.; Enayat, Mostafa; Sun, Zhixiang; Wahl, Peter; Schnyder, Andreas P.

doi:10.1103/physrevb.93.174504

Cited by 23 publications

(32 citation statements)

References 29 publications

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“…1 shows the data below 2 T in enlarged scale. A pronounced peak effect emerges near the superconducting upper critical field, which was estimated to be approximately 75 mT from specific-heat and STS measurements [19,25]. Quantum oscillations become visible above about 1.5 T and greatly increase in amplitude towards higher fields [29].…”

Section: Methodsmentioning

confidence: 99%

“…It crystallizes in an orthorhombic lattice and undergoes a structural transition upon cooling below 210 • C to a monoclinic structure of its own type (space group P2 1 , No. 4) [13] and exhibits bulk type-II weak-coupling clean-limit superconductivity below T c = 3.7K [14][15][16][17][18][19][20]. Strong SOC has been clearly evidenced experimentally by means of angle-and spin-resolved photoemission spectroscopy (ARPES) [21][22][23][24] as well as scanning tunneling spectroscopy (STS) [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Fermi surface investigation of the noncentrosymmetric superconductor α -PdBi

et al. 2020

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The noncentrosymmetric superconductor α-PdBi is a candidate material for the realization of topological superconductivity. Here, we present a detailed de Haas-van Alphen (dHvA) study together with band-structure calculations within the framework of density functional theory. The rich dHvA spectra are a manifestation of the 13 bands that cross the Fermi energy E F. We find excellent agreement between calculated and experimentally observed dHvA frequencies with moderately enhanced effective masses. One of the bands crossing E F , the so-called α band, exhibits topological character with Weyl nodes lying 43 meV below E F .

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fermi surface investigation of the noncentrosymmetric superconductor α -PdBi

et al. 2020

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“…At the same time, superconductors with heavy transition elements may be more straightforward systems for exploring the consequences of inversion symmetry breaking. Indeed, in some cases exotic pairing was detected, as for instance in Li 2 Pt 3 B [10,11], whereas for some other compounds, such as Re 6 Zr [12,13] or BiPd [14][15][16][17], the results are still controversial. In particular, BiPd is especially interesting since for this material topologically nontrivial surface states were reported in the normal state [16].…”

Section: Introductionmentioning

confidence: 99%

Superconducting properties of noncentrosymmetricNb0.18Re0.82thin films probed by transport and tunneling experiments

et al. 2016

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Superconducting thin films of the noncentrosymmetric superconductor Nb 0.18 Re 0.82 were successfully deposited by UHV sputtering technique. X-ray diffraction analysis indicated that the films are polycrystalline, with a preferential (nn0) orientation and the lattice parameter in agreement with the expected single α-Mn cubic phase. A detailed electrical characterization of the samples as a function of the thickness (3.5 nm d 142 nm) was performed both in the normal and in the superconducting states, revealing a well-established superconducting ordering, as well as an estimated value of the upper critical field, μ 0 H c2 , comparable with the Pauli limit. Finally, the symmetry of the order parameter was probed by tunneling spectroscopy on Al/Al 2 O 3 /Nb 0.18 Re 0.82 heterostructures, which provides evidence for a single s-wave superconducting gap.

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“…This observation of distinct Dirac surface states originating from the opposing surface terminations represents a unique demonstration of the impact of the lack of inversion symmetry on the electronic states.The crystal growth using a modified Bridgman-Stockbarger technique has been described in detail elsewhere [40]. The crystals were cooled slowly through the α−β phase transition to maximize the domain size of the low-temperature α phase; resulting in high-quality crystals [30]. At low temperature α-BiPd (in the following referred to as "BiPd") forms in the noncentrosymmetric space group P2 1 [21][22][23][24].…”

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confidence: 99%

“…Noncentrosymmetric BiPd [20][21][22][23][24] becomes superconducting below 3.8 K [25][26][27][28][29][30] and offers a unique opportunity to study the interplay between SOC and superconductivity. The large spin-orbit interaction of the heavy element Bi results in a sizeable spin splitting of the bulk bands of BiPd [29].…”

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confidence: 99%

Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd

et al. 2016

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Materials with strong spin-orbit coupling (SOC) have in recent years become a subject of intense research due to their potential applications in spintronics and quantum information technology. In particular, in systems which break inversion symmetry, SOC facilitates the Rashba-Dresselhaus effect, leading to a lifting of spin degeneracy in the bulk and intricate spin textures of the Bloch wave functions. Here, by combining angular resolved photoemission (ARPES) and low temperature scanning tunneling microscopy (STM) measurements with relativistic first-principles band structure calculations, we examine the role of SOC in single crystals of noncentrosymmetric BiPd. We report the detection of several Dirac surface states, one of which exhibits an extremely large spin splitting. Unlike the surface states in inversion-symmetric systems, the Dirac surface states of BiPd have completely different properties at opposite faces of the crystal and are not trivially linked by symmetry. The spin-splitting of the surface states exhibits a strong anisotropy by itself, which can be linked to the low in-plane symmetry of the surface termination. PACS numbers: 79.60.Bm,73.20.-r,71.70.EjThe interplay of strong spin-orbit coupling (SOC) with superconductivity has become a major focus of research in recent years, as both are essential ingredients to stabilize Majorana bound states. The spin-orbit interaction affects the electronic states in a material in various ways and in particular can lead to non-trivial topologies of the band structure. In topological insulators SOC separates the conduction and valence bands, leading to an insulating state with an inverted band gap [1][2][3]. The latter leads directly to the presence of Dirac surface states protected by time-reversal symmetry [4][5][6]. Another consequence of SOC is the Rashba effect [7-10], which in the absence of inversion symmetry lifts the spin degeneracy of the electronic bands, generating intricate spin textures in the electronic wave functions [11][12][13]. Commonly observed at surfaces or interfaces, in noncentrosymmetric materials the Rashba-Dresselhaus effect leads to a lifting of spin-degeneracy of the bulk bands. Combined with superconductivity this can lead to mixing of spin-singlet and spin-triplet pairing components [14,15] and, more interestingly, to a topologically nontrivial superconducting phase [16][17][18][19].Noncentrosymmetric BiPd [20-24] becomes superconducting below 3.8 K [25-30] and offers a unique opportunity to study the interplay between SOC and superconductivity. The large spin-orbit interaction of the heavy element Bi results in a sizeable spin splitting of the bulk bands of BiPd [29]. This in turn can lead to nontrivial wavefunction topologies and unconventional superconducting states [31,32]. Along with the half-Heusler compounds [33][34][35] and PbTaSe 2 [36][37][38], BiPd constitutes a rare example of a noncentrosymmetric superconductor which cleaves easily, enabling high-resolution surfacesensitive spectroscopy of its electronic states [29,39...

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Upper critical field of the noncentrosymmetric superconductor BiPd

Cited by 23 publications

References 29 publications

Fermi surface investigation of the noncentrosymmetric superconductor α -PdBi

Fermi surface investigation of the noncentrosymmetric superconductor α -PdBi

Superconducting properties of noncentrosymmetricNb0.18Re0.82thin films probed by transport and tunneling experiments

Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd

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