Effect of chromium doping on superconductivity and charge density wave order in the kagome metal Cs(V1−xCrx)3

Celebrating 1 year of Frontiers in Electronic Materials

“…The aforementioned results are derived using chemical dopants that avoid the V-sites in the kagome network; however, qualitatively similar trends in the evolution of CDW and SC order parameters have been reported in individual studies leveraging V-site substitution. Ti-doped CsV 3 Sb 5 renders a phase diagram qualitatively similar to Sn-doped CsV 3 Sb 5 , and Cr-doped CsV 3 Sb 5 also reveals an asymmetric persistence of the CDW order (Ding et al, 2022). We note one difference: T c is reported to be rapidly suppressed in Cr-doped samples, which is distinct from our Te-doped data.…”

“…In a rigid band shift model, the relative shift of the Van Hove points relative to E F should be important to the response of the system, and in the more realistic case of orbitally selective doping, the impact of the relative changes in the Sb p z mixed bands on the CDW state should inform more about their role in the formation of charge order. Prior studies have partially explored hole and electron doping via substitution on the vanadium sites of Ti and Cr (Ding et al, 2022), respectively. While Ti doping shows a non-monotonic evolution of SC as CDW order is suppressed, Cr doping instead shows a slower suppression of CDW order and a rapid quenching of T c .…”

“…Specifically, the coupling between CDW order and SC in AV 3 Sb 5 compounds has been experimentally explored through several approaches. These include tracking the evolution of both order parameters as the system is perturbed via chemical pressure (Ortiz et al, 2023;Liu et al, 2022a,b;Zhou et al, 2023), change in dimensionality (Song et al, 2021;Wang et al, 2021;Song et al, 2023), external pressure (Wang et al, 2021;Feng et al, 2023;Zhu et al, 2022;Wang et al, 2021;Du et al, 2022;Yu et al, 2022;Zheng et al, 2022), uniaxial strain (Qian et al, 2021), and chemical doping (Oey et al, 2022a;Oey et al, 2022b;Liu et al, 2023;Ding et al, 2022;Sur et al, 2023). One function of these perturbations is to shift the chemical potential about the multiple Van Hove singularities nearby; however, the dominant perturbation in the case of doping is often considered to be the orbitally selective modification of the Sb p z pocket at the Γ point in the Brillouin zone (LaBollita and Botana, 2021).…”

Band splitting and enhanced charge density wave modulation in Mn-implanted CsV3Sb5

“…In Cs(V 1− x Cr x ) 3 Sb 5 , G. F. Ding et al used chromium substitution for vanadium to introduce extra electron carriers and revealed that the CDW order was gradually suppressed under doping. 30 Y. P. Song et al 31 realized hole doping through thickness control and selective oxidation operation in CVS thin flakes, thereby inducing a higher superconducting transition temperature ( T C ). Y. M. Oey et al 32 realized hole doping by Sn substitution of Sb.…”

Electron-hole asymmetry in the phase diagram of carrier-tuned CsV3Sb5

“…Specifically, the coupling between CDW order and SC in AV 3 Sb 5 compounds has been experimentally explored through several approaches. These include tracking the evolution of both order parameters as the system is perturbed via chemical pressure (Ortiz et al, 2023;Li et al, 2022;Liu et al, 2022a,b;Zhou et al, 2023), change in dimensionality (Song et al, 2021;Wang et al, 2021;Song et al, 2023), external pressure (Wang et al, 2021;Feng et al, 2023;Yu et al, 2021;Du et al, 2021;Zhang et al, 2021;Zhu et al, 2022;Wang et al, 2021;Du et al, 2022;Yu et al, 2022;Zheng et al, 2022), uniaxial strain (Qian et al, 2021), and chemical doping (Oey et al, 2022a;Oey et al, 2022b;Liu Y. et al, 2022;Yang et al, 2022;Liu et al, 2023;Ding et al, 2022;Sur et al, 2023). One function of these perturbations is to shift the chemical potential about the multiple Van Hove singularities nearby; however, the dominant perturbation in the case of doping is often considered to be the orbitally selective modification of the Sb p z pocket at the Γ point in the Brillouin zone (LaBollita and Botana, 2021).…”