TY - JOUR
T1 - Bosonic Confinement and Coherence in Disordered Nanodiamond Arrays
AU - Zhang, Gufei
AU - Samuely, Tomas
AU - Du, Hongchu
AU - Xu, Zheng
AU - Liu, Liwang
AU - Onufriienko, Oleksandr
AU - May, Paul W.
AU - Vanacken, Johan
AU - Szabó, Pavol
AU - Kačmarčík, Jozef
AU - Yuan, Haifeng
AU - Samuely, Peter
AU - Dunin-Borkowski, Rafal E.
AU - Hofkens, Johan
AU - Moshchalkov, Victor V.
PY - 2017/11/28
Y1 - 2017/11/28
N2 - In the presence of disorder, superconductivity exhibits short-range characteristics linked to localized Cooper pairs which are responsible for anomalous phase transitions and the emergence of quantum states such as the bosonic insulating state. Complementary to well-studied homogeneously disordered superconductors, superconductor-normal hybrid arrays provide tunable realizations of the degree of granular disorder for studying anomalous quantum phase transitions. Here, we investigate the superconductor-bosonic dirty metal transition in disordered nanodiamond arrays as a function of the dispersion of intergrain spacing, which ranges from angstroms to micrometers. By monitoring the evolved superconducting gaps and diminished coherence peaks in the single-quasiparticle density of states, we link the destruction of the superconducting state and the emergence of bosonic dirty metallic state to breaking of the global phase coherence and persistence of the localized Cooper pairs. The observed resistive bosonic phase transitions are well modeled using a series-parallel circuit in the framework of bosonic confinement and coherence.
AB - In the presence of disorder, superconductivity exhibits short-range characteristics linked to localized Cooper pairs which are responsible for anomalous phase transitions and the emergence of quantum states such as the bosonic insulating state. Complementary to well-studied homogeneously disordered superconductors, superconductor-normal hybrid arrays provide tunable realizations of the degree of granular disorder for studying anomalous quantum phase transitions. Here, we investigate the superconductor-bosonic dirty metal transition in disordered nanodiamond arrays as a function of the dispersion of intergrain spacing, which ranges from angstroms to micrometers. By monitoring the evolved superconducting gaps and diminished coherence peaks in the single-quasiparticle density of states, we link the destruction of the superconducting state and the emergence of bosonic dirty metallic state to breaking of the global phase coherence and persistence of the localized Cooper pairs. The observed resistive bosonic phase transitions are well modeled using a series-parallel circuit in the framework of bosonic confinement and coherence.
KW - nanodiamond
KW - amorphous carbon
KW - disordered hybrid arrays
KW - confinement and coherence
KW - superconducting order parameter
UR - http://www.scopus.com/inward/record.url?scp=85035309970&partnerID=8YFLogxK
U2 - 10.1021/acsnano.7b07148
DO - 10.1021/acsnano.7b07148
M3 - Article (Academic Journal)
C2 - 29125286
AN - SCOPUS:85035309970
SN - 1936-0851
VL - 11
SP - 11746
EP - 11754
JO - ACS Nano
JF - ACS Nano
IS - 11
ER -