P. L. Russo

Muon spin relaxation studies of magnetic-field-induced effects in high-Tc superconductors

Muon spin relaxation measurements in high transverse magnetic fields [FORMULA: SEE TEXT] revealed strong field-induced quasistatic magnetism in the underdoped and Eu-doped (La,Sr)2CuO4 and La1.875Ba0.125CuO4, existing well above Tc and TN. The susceptibility counterpart of Cu spin polarization, derived from the muon spin relaxation rate, exhibits a divergent behavior towards T approximately 25 K. No field-induced magnetism was detected in overdoped La1.81Sr0.19CuO4, optimally doped Bi2212, and Zn-doped YBa2Cu3O7.

New magnetic phase diagram of (Sr,Ca)2RuO4

High-T(c) cuprates, iron pnictides, organic BEDT and TMTSF, alkali-doped C(60), and heavy-fermion systems have superconducting states adjacent to competing states exhibiting static antiferromagnetic or spin density wave order. This feature has promoted pictures for their superconducting pairing mediated by spin fluctuations. Sr(2)RuO(4) is another unconventional superconductor which almost certainly has a p-wave pairing. The absence of known signatures of static magnetism in the Sr-rich side of the (Ca, Sr) substitution space, however, has led to a prevailing view that the superconducting state in Sr(2)RuO(4) emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca)(2)RuO(4) has a ground state with static magnetic order over nearly the entire range of (Ca, Sr) substitution, with spin-glass behaviour in Sr(1.5)Ca(0.5)RuO(4) and Ca(1.5)Sr(0.5)RuO(4). The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr(2)RuO(4) to competing static magnetic order.

Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu(Cl,Br)La(Nb,Ta)(2)O-7: Evolution from spin-gap to antiferromagnetic state

We report muon spin relaxation

2D Kagomé ordering in the 3D frustrated spinel Li2Mn2O4

(ensuremath{mu}text{SR})

Muon spin rotation measurements of heterogeneous field response in overdoped La2-xSrxCuO4

and magnetic-susceptibility measurements on

Study of the Ground State Properties of LiHoxY1-xF4 Using Muon Spin Relaxation

text{Cu}(text{Cl},text{Br})text{La}{(text{Nb},text{Ta})}_{2}{text{O}}_{7}

Impurity-induced singlet breaking in SrCu2(BO3)2

, which demonstrate: (a) the absence of static magnetism in

Study of the ground state properties of LiHo(x)Y(1-x)F4 using muon spin relaxation.

(text{CuCl}){text{LaNb}}_{2}{text{O}}_{7}

Study of the Ground State Properties ofLiHoxY1−xF4Using Muon Spin Relaxation

down to 15 mK confirming a spin-gapped ground state; (b) phase separation between partial volumes with a spin-gap and static magnetism in

Study of the ground state properties of

(text{CuCl})text{La}{(text{Nb},text{Ta})}_{2}{text{O}}_{7}